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ЦитироватьGSat 14

GSAT-14 is intended to serve as a replacement for GSAT 3 (EDUSAT) as the spacecraft is configured with 6 Ku- and 6 Extended-C-band transponders providing India coverage beams. In addition, the spacecraft also carries Ka-band beacons, which are planned to be used to carry out studies related to rain and atmospheric effects on Ka-band satellite communication links in Indian region.

The spacecraft weighs around 2050 kg and is planned to be launched by GSLV with indigenous cryogenic upper stage.

Nation:      India
Type / Application:      Communication
Operator:      Insat
Contractors:      ISRO
Equipment:      6 Ku-band, 6 ext. C-band transponders, Ka-band beacons
Configuration:      I-2K (I-2000) Bus
Propulsion:      LAM
Power:      2 deployable solar arrays, batteries
Lifetime:      
Mass:      2050 kg
Orbit:      GEO

ЦитироватьOn launch of two Geosynchronous Satellite Launch Vehicle (GSLVs) and Polar Satellite Launch Vehicle (PSLV) this fiscal, Radhakrishnan said ISRO has studied the reasons for the failure in 2010. "Now GSLV will undergo an endurance test of 1,000 seconds and a vacuum test at a special facility at the Liquid Propellant System Centre at Mahendragiri in Tamil Nadu,
where a Rs 300 crore facility for vacuum test has been made," he said.

"Once we get the green signal from the Ground Testing Team, we would be ready for the GSLV launch," he said.

PS Veeraraghavan, Director, Vikram Sarabhai Space Centre, who was present, said ISRO will launch a low cost communication satellite GSAT-14 on board GSLV D5 in September/October 2012.

ЦитироватьISRO successfully tests indigenous cryogenic engine
Published: Saturday, May 12, 2012, 21:23 IST
Place: Chennai | Agency: PTI

In a major step, ISRO today successfully tested the indigenous cryogenic engine to be used to propel the country's Geosynchronous Satellite Launch Vehicle.

The test was conducted at the Liquid Propulsion Systems Centre at Mahendragiri in Tamil Nadu's Tirunelveli district.

"The acceptance test of the indigenous cryogenic engine for the forthcoming GSLV-D5 flight was conducted successfully for 200 seconds at 17:10 hrs...," an ISRO statement said.

"The performance of the engine was as predicted," it said.

The maiden flight test of the indigenous cryogenic stage onboard GSLV-D3 failed in May 2010 after it developed a snag and the rocket plunged into the sea minutes after lift-off.

ISRO chief K Radhakrishnan had said last month that GSLV would undergo two more tests at the Mahendragiri facility.

He had also said ISRO was planning a GSLV launch with Indian cryogenic engine during September-October.

ISRO plans to fly two GSLV rockets at an interval of six months with the third one meant for the Chandrayaan-2 moon mission.

ЦитироватьThe space agency plans to have the cryogenic engine and stage ready by October for the launch of GSLV D5 in December.

ЦитироватьAgreeing that ISRO normally do not launch any rockets during that period, Veeraraghavan said if the weather is conducive the rocket could be sent up.

He said ISRO is also planning to launch GSAT-14 a small communication satellite that is considered as the replacement for India's the education satellite Edusat, by this December or January next year using its heavier rocket Geosynchronous Satellite Launch Vehicle (GSLV). The spacecraft will carry Ka band beacons, which are planned to be used to carry out studies related to rain and atmospheric effects on Ka band satellite communication links in Indian region.

ISRO will be flying the GSLV rocket this time with its own cryogenic engine. This will be the second GSLV rocket to fly with indigenous cryogenic engine. The first GSLV rocket that flew with indigenous cryogenic engine in 2010 was a failure.

ЦитироватьSuccessful ignition of indigenous cryogenic engine
Special Correspondent

Successful ignition of an indigenous cryogenic engine on Wednesday at Mahendragiri in Tamil Nadu's Kanyakumari district, in conditions simulating the high altitude atmosphere, has boosted the confidence of the Indian Space Research Organisation (ISRO) to go ahead with the launch of a Geo-synchronous Satellite Launch Vehicle (GSLV-D5) in July.

The hot-test took place in the newly-built high altitude test facility (HAT) at ISRO's Liquid Propulsion Systems Centre (LPSC) at Mahendragiri.

"The test was held at 7.55 p.m. on Wednesday, simulating the high altitude conditions to see whether ignition of the indigenously developed cryogenic engine takes place smoothly, as per the expected temperature, pressure and flow parameters," said Director of LPSC M.C. Dathan.

"The ignition was perfect and it gave all the parameters as per our predictions and it has given us an excellent confidence to go ahead with the GSLV-D5 launch from Sriharikota in July," he noted. The engine, which uses liquid oxygen and liquid hydrogen as propellants and develops a thrust of 7.5 tonnes, powers the GSLV's upper stage.

With the successful test, the indigenous cryogenic engine would be fully assembled and the cryogenic stage itself delivered at Sriharikota in a month's time. "Once it reaches Sriharikota, it may take more than two months to fully assemble the vehicle and conduct all tests. So we are planning to launch the GSLV-D5 in the second half of July," said Mr. Dathan.

GSLV-D5, with the indigenous cryogenic engine, will put into orbit a communication satellite called GSAT-14.

Mr. Dathan said the HAT facility was realised in a record time of one year. "This facility is a unique one in the country for testing cryogenic engines, simulating the high altitude conditions."

The launch of a GSLV-D3 with an indigenous cryogenic engine in April 2010 ended in failure. Although the engine ignited in vacuum in space, the ignition could not be sustained.

ЦитироватьFresh GSLV launch attempt in July
Amitabh Sinha : New Delhi, Wed Apr 10 2013, 03:48 hrs

The Indian Space Research Organisation (ISRO) will make a fresh attempt at launching the Geosynchronous Satellite Launch Vehicle (GSLV), the last two flights of which have ended in failure, in July this year, ISRO chairman K Radhakrishnan said on Tuesday.

The GSLV will carry a communication satellite GSAT-14 to be put into the space.

GSLV is the second satellite launch vehicle developed by ISRO, the other one being PSLV, or Polar Satellite Launch Vehicle, which has just completed the 22nd successful launch in a row. The GSLV has been less lucky, with four of its 10 attempted flights, ending in failure.

"GSLV is an excellent vehicle, a beautiful vehicle. As compared to the PSLV, it is much less complex, except for one stage. It is far simpler to handle, though it has a large number of control components," Radhakrishnan said at a public lecture at the Indian National Science Academy.

The GSLV to be launched in July will be run on an indigenous cryogenic engine. Its assembly has started at Sriharikota facility on January 31, Radhakrishnan said. The cryogenic stage is being integrated and one more test is planned to be conducted later this month.

Radhakrishnan said the next generation of the GSLV, called GSLV-Mark III, which is expected to revolutionise India's space capabilities, would be launched in January next year. The GSLV-Mk III would be the heaviest Indian rocket to fly off, and would be capable of putting large satellites, weighing up to 5 tonne, into space. The present GSLV can carry up to 2.5 tonne.

GSLV-Mk III is also planned to be used for human space flights in future. "We are targeting an experimental flight of the GSLV-Mk III in January. Further development will happen after that," Radhakrishnan said.

The project director of GSLV-Mk III, S Somnath, said simulation of the flight were being done. "But there are certain tests that cannot be performed on the ground. So an experimental launch is required," he said.

ЦитироватьHigh altitude test of cryogenic engine successful; ISRO to launch GSLV-D5 in July
Laxmi Ajai Prasanna, TNN | Apr 25, 2013, 02.46 AM IST

THIRUVANANTHAPURAM: Scientists at ISRO's Liquid Propulsion Systems Centre here are hopeful of finishing the work on the indigenous cryogenic engine by May 15 after its recent successful test at the high altitude test facility of the centre. The engine will be taken to Sriharikotta for the launch of geosynchronous satellite launch vehicle GSLV D-5 by July.

"A short-duration test in 3.5 seconds confirmed stable ignition of the cryogenic engine. A simulated high altitude condition was created with high capacity pumps in a vacuum chamber and the test proved successful, which has given us a lot of confidence. The engine will be completely ready by May 15, or at the most May 20, after which it will be taken to Sriharikota," LPSC director M C Dathan told TOI on Wednesday.

"One more HAT test is planned early next month to ensure the readiness of the cryogenic facility though it is not mandatory. A review meet of all senior officials of ISRO establishments will be held at Mahendragiri on April 29 to take stock of the facility," Dathan said.

The cryogenic engine uses a propellant combination of liquid oxygen and liquid hydrogen to develop a thrust of 7.5 tonnes to boost the cryogenic upper stage of GSLV-D5. He said the fluid line checking of the liquid oxygen and liquid hydrogen in propellants would be done at Sriharikota and the GSLV-D5 would be launched to put communication satellite GSAT-14 into orbit in the second week of July.

Vikram Sarabhai Space Centre director S Ramakrishnan said they had come a long way from the failure of the GSLV-D3 launch. "We had narrowed down the failure to the hydrogen fuel booster pumps of the engine. After a series of endurance tests and the latest successful HAT test, the engine is now ready."

He said preparations for the launch of polar satellite launch vehicle, PSLV-C22, were also in full swing.

ЦитироватьBANGALORE, April 27, 2013
Indigenous GSLV to be moved to Sriharikota by May 15

 Ahead of its crucial and long-awaited launch in July or August, fully indigenous satellite launch vehicle GSLV-D5 is being readied to be shifted to the Sriharikota launch port by May 15, according to Indian Space Research Organisation (ISRO) Chairman K. Radhakrishnan.

GSLV-D5, powered by indigenous cryogenic upper stage, is being given final touches at the Mahendragiri centre in Tamil Nadu.

GSLV-F06, launched in December 2010 and powered by a Russian cryogenic stage engine, failed. Before that, the GSLV-D3, flown with a home-grown cryogenic stage engine, also failed in April 2010.

Since then, ISRO has made many modifications and corrections in the engine. It has conducted 35 ground tests and a simulated high-altitude test till as recently as March, Dr. Radhakrishnan said in his lecture in memory of Air Chief Marshal L.M. Katre on Saturday.

An Indian GSLV that can lift communication satellites weighing up to two tonnes into orbit is badly needed to keep up the satellite capacity for different users and the country's self-reliance in launching its own communication satellites.

ЦитироватьGSLV D5 launch planned in July: Union Minister V Narayanasamy
Thursday, May 16, 2013, 20:47 IST | Place: Chennai | Agency: PTI

ISRO's last two attempts to launch satellites were a failure.

India plans to undertake launch of GSLV D5, fitted with indigenous cryogenic engine and carrying communication satellite GSAT-14, in July, Union Minister V Narayanasamy said on Thursday.

"Russia had denied us the cryogenic engine. Our scientists are working hard for indigenous engine. In July, India will launch GSAT-14 from the spaceport in Sriharikota," the Minister of State for PMO told a convocation in Chennai.

GSAT-14 satellite with six extended C band and 6 Ku band transponders envisages enhancing the communication transponder capacity, ISRO sources said.

ISRO's last two attempts to launch satellites were a failure. GSLV-F06 carrying satellite GSAT-5P on December 25, 2010 and GSLV-D3 carrying satellite GSAT-4 on April 15, 2010 were unsuccessful.

ЦитироватьFollowing the PSLV-XL launch, ISRO is planning to launch its communication satellite G-Sat 14 using heavier rocket - Geosynchronous Satellite Launch Vehicle (GSLV) - powered with a domestic cryogenic engine sometime in August, 2013.

 Preparatory work for the G-Sat 14 launch is going ahead at the rocket launch pad in Sriharikota in Andhra Pradesh, around 80 km from here.

Цитироватьantriksh пишет:
GSLV modifications for the D5 mission
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ЦитироватьISRO sources said preparations are on at the second launch pad at the spaceport of Sriharikota for the launch of GSLV-D5 (Geosynchronous Satellite Launch Vehicle-Development flight 5) in August.

GSLV-D5 aerodynamic characterisation has been revisited following the back-to-back failure of GSLV flights - one with indigenous cryogenic engine and another with a Russian-made one in 2010.

Force measurements, steady and unsteady pressure measurements and aero elastic tests have already been conducted using wind tunnel models at National Aerospace Laboratory, Bangalore and Glavkosmos, Russia.

Computational fluid dynamics simulations have been carried out in-house for incremental effects on protrusion, overall aerodynamic load distribution and distribution on protrusions, according to ISRO.

GSLV-D5 would carry GSAT-14 satellite with six extended C band and six Ku band transponders, envisaged to enhance communication transponder capacity.

The satellite employs the standard 2,000 Kg class bus (I-2K) with a power handling capability of around 2.5 KW and a lift-off mass of 1,980 kg, the space agency added.

Цитироватьantriksh пишет:
Cryo stage is already at Sriharikota

ЦитироватьISRO's GSLV Mk-2 Launcher Return to Flight Test in August
                
Posted on July 1, 2013 (http://www.sawfnews.com/isros-gslv-mk-2-launcher-return-to-flight-test-in-august/) by vkthakur (http://www.sawfnews.com/author/vkthakur/)               
(https://img.novosti-kosmonavtiki.ru/87258.jpg)
GSLV-D03 Photo Credit: ISRO

 ISRO hopes to resume its GLSV medium launcher operations with the return to flight test of GSLV D05 fitted with the indigenous Cryogenic Upper Stage (CUS) and carrying the communication satellite GSAT-14, tentatively on August 6, 2013.
ISRO's 2012 Annual Report had stated that the next two GSLV missions would be conducted as developmental flights.
GSLV-D05 will be test flown with a 3.4-m payload fairing and indigenous CUS. A follow-up test flight, GSLV-D05, will be conducted with a 4-m payload fairing and indigenous CUS.
ISRO had earlier fitted the 4-m composite payload fairing for the first time on GSLV F06 for its December 2010 launch. The launch failed because a group of 10 connectors located at the bottom portion of the Russian Cryogenic Upper Stage snapped because of aerodynamic loads induced distortion in the fairing, cutting off command signals from the onboard computer in the Equipment Bay (located near the top of the vehicle) to the control electronics of the four L40 Strap-ons of the First Stage.
The launch failure led to the grounding of the GLSV launcher.
A Failure Analysis Committee recommended strengthening of the shroud.
All GSLV flights before GSLV F06 featured a 3.4-m aluminium payload fairing.
ISRO's focus in the GSLV D05 test in August would be on proving the indigenous CUS which failed during its maiden test on GLSV-D3 on April 15, 2010
The failure was attributed to a malfunction of the booster pump of the indigenous CUS.
On October 12, 2011, S.Ramakrishnan, director of ISRO's Liquid Propulsion Systems Centre (LPSC) said the agency had identified and fixed the reasons for the failure of the first engine during the flight of GSLV-D3.
"We have studied the design of booster pumps and redesigned it. The computer simulation was done and validated." he said.
The booster pump has been successfully hot tested twice in the past three months at the newly-built high altitude test facility (HAT) at ISRO's Liquid Propulsion Systems Centre (LPSC) at Mahendragiri.
LPSC director MC Dathan told TOI on Friday, June 28 that a mission readiness meet for GSLV-D05 launch was held on Thursday.
Dathan added, "We are very confident after the repeat successful High Altitude Tests in the last three months. Yet we are anxious about the indigenous cryogenic stage which was moved from LPSC Mahendragiri on May 13, it is being integrated with the vehicle at Sriharikota and further checks will be completed within 45 days. It will be ready by July end and tentatively the launch is set for August 6."
If the two missions are successful, the GSLV program will be considered as being back on track and the launcher will once again be used to launch high value payloads like Chandrayaan 2, which could be launched in 2014.

ЦитироватьISRO to mate cryogenic engine with its rocket on Friday
Thursday, Jul 4, 2013, 21:51 IST | Place: Chennai | Agency: IANS

ISRO chairman K Radhakrishnan had announced that GSLV rocket powered by India's own cryogenic engine carrying communication satellite GSat-14 will be launched on August 6.

The Indian space agency will be mating its own cryogenic engine with its heavy rocket - the geo-synchronous satellite launch vehicle (GSLV) - Friday afternoon at its spaceport in Sriharikota in Andhra Pradesh, said officials.

"The process of fixing our cryogenic engine with GSLV will begin tomorrow (Friday) afternoon. Then various tests will be carried out before the satellite is fixed with the rocket," an Indian Space Research Organisation (ISRO) official, who did not want to be named, said.

ISRO chairman K Radhakrishnan had announced that GSLV rocket powered by India's own cryogenic engine carrying communication satellite GSat-14 will be launched August 6.

This will be the first mission of GSLV during the last three years after two such rockets failed in 2010.

One of the GSLV rockets flew with Indian cryogenic engine and the other one with a Russian engine.

The GSLV is a three stage/engine rocket. The first stage is fired with solid fuel, the second is the liquid fuel and the third is the cryogenic engine.

ЦитироватьGSLV D5 mission: Isro begins tests on indigenous cryo engine

By Meera Vankipuram   Jul 09 2013 , Chennai

The Indian Space Research Organisation (ISRO) has commenced testing the indigenously developed cryogenic engine, which has been mounted on the Geosynchronous Satellite Launch Vehicle (GSLV) — MK II.

Isro chairman K Radhakrishnan had announced earlier that the GSLV D5 mission, carrying GSAT-14, the communication satellite, would be launched on August 6 fr om the Satish Dhawan Space Centre at Sriharikota.

"Vehicle integration is going on at present. The cryogenic engine has been mounted on the launch vehicle, and elaborate checks are on," Isro spokesperson Deviprasad Karnik said.

After a series of successful high-altitude tests at Isro's Liquid Propulsion Systems Centre (LPSC) in Thiruvananthapuram in the last few months, the engine was moved to Sriharikota, from wh ere the GSLV will be launched.

The GSLV is a three-stage vehicle — the first stage has solid fuel, and the second stage is an engine carrying liquid propellant. The third stage, the indigenously built cryogenic upper stage, uses cryogenic propellants. According to senior Isro officials, the cryogenic stage enhances India's indigenous capability to launch communication satellites and other ambitious space missions.

This launch is crucial for India as the previous two GSLV missions in 2010 were unsuccessful. Of the two previous missions, one of the launch vehicles was fitted with the Indian cryogenic engine.

The cryo-powered GSLV rockets are important for the country's future space programmes like Chandrayaan-2. All the initial GSLV missions were fitted with cryogenic engines purchased from Russia. In 1992, when the United States pressured Russia to deny India the cryogenic technology, India decided to build the engine on its own.

Since then scientists at Isro have been working on developing an indigenous cryo engine, tested in a previous GSLV mission in 2010, which ended in failure.

meera.vankipuram

@mydigitalfc.com

ЦитироватьISRO gets busy with GSLV launch
Special Correspondent

After slotting its nine-day-old navigation satellite, the Indian Space Research Organisation (ISRO) now turns full steam on its next and high-stakes test, the flight of the Geo Synchronous Launch Vehicle (GSLV) medium-lift satellite launcher.

ISRO Chairman and Department of Space Secretary K. Radhakrishnan on Monday said the launcher, numbered GSLV-D5, was planned for launch in the second week of next month but not before August 6.

After two-and-half years

The GSLV, which is so crucial for the country's space programme, is being resumed after two-and-half years. Two consecutive launchers flown in 2010 failed, setting back the programme and putting the vehicle and the indigenous cryogenic stage through rigorous checks and tests.

It will be also the second outing of the homemade cryogenic stage, in place of the Russian stages that powered six of the seven previously flown GSLVs.

Dr. Radhakrishnan said the cryogenic stage had been modified since the April 2010 failure, tested many times and now integrated as the third and upper stage of the rocket at the Sriharikota launch site. He spoke after launching a new programme at the Jawaharlal Nehru Planetarium.

The GSLV, flown first in 2001, has been a partial success. ISRO urgently needs to ready the launcher for putting its communication satellites in earth-fixed or geosynchronous slots in space — or it must pay and use foreign (which have been mostly European Ariane) launch vehicles.

Its older and light-lift launcher, the PSLV, has a neat record after flying 22 times.

The space agency has spared no test or modification on this launcher, which will take up the 2,000-kg GSAT-14 communication satellite: this will replace the experimental Edusat/GSAT-3 which was flown in 2004.

ЦитироватьWednesday 24 July 2013
News updated at 12:42 AM IST

Isro to launch GSAT-4 in August
Bangalore, July b8, 2013, DHNS:

The indigenous cryogenic engine boosting India's Geosynchronous Satellite Launch Vehicle (GSLV) will launch the GSAT-4 satellite in the second week of August.

With an otherwise good track record, earlier attempts to launch the GSLV using the indigenously developed cryogenic engine had caused much embarrassment to the Indian Space Research Organisation (Isro).

Answering a specific question from Deccan Herald, Isro Chairman K Radhakrishnan said on Monday: "The cryogenic engine has been modified, tested and integrated. The GSLV-D5 will launch the GSAT-4 in the second week of August (after August 6)."

The GSAT–4 satellite, with six extended C-band and six Ku-band transponders, is envisaged to enhance communication transponder capacity, in line with the need felt by Isro based on demand.

ЦитироватьISRO's GSLV-D5 slated for August 19 launch
Last Updated: Tuesday, July 23, 2013, 21:52
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Zee Media Bureau

 Bangalore: Indian Space Research Organisation, ISRO said on Tuesday that it is gearing up to flight-test its GSLV-D5 with indigenous cryogenic engine on August 19.

 ISRO's announcement came after a national team of experts gave the go-ahead. The team included Prof U R Rao and Prof Roddam Narasimha and academics associated with ISRO's rocket programme.

 "The moment we are talking about is August 19th, as a tentative schedule and the time is around 5 PM," said ISRO Chairman K Radhakrishnan. "Vehicle (GSLV or rocket) is already assembled and we have done electrical checks on the vehicle", he said. "We have done nearly 35 ground tests since we had the April 2010 failure, on sub-systems, on the engine and on a similar engine in high altitude conditions".

The space agency designed and developed some components itself and not sourced from outside.

 While other operational rocket, PSLV, has lim itations up to what mass it can handle, India's largest rocket GSLV, having a cryogenic engine, can develop more thrust and can carry heavier communication satellites to a much higher orbit above the earth.

 "Cryogenic route has to be there for the future of the larger communication satellites", Radhakrishnan, also Secretary in the Department of Space, explained, noting that ISRO took up indigenous cryogenic engine programme in 1992.

 He also said the August 19 mission is technically and emotionally important as the previous venture was a failure. "We have to see through. Stakes are very high, seriousness is very high. Entire organisation feels for it. For the last three years, we have been at it".

 ISRO's GSLV-D5 is now slated for launch, with GSAT-14 satellite on board from Sriharikota spaceport more than three years after the failure on flight testing of the indigenous cryogenic stage in GSLV-D3 mission.

 This failure was attributed to the anomalous stopping of Fuel Booster Turbo Pump (FBTP).

 After the unsuccessful April 15, 2010, mission, ISRO conducted extensive failure analysis studies and reviews. ISRO officials said cryogenic stage FBTP was modified as per GSLV-D3 failure analysis committee recommendations and qualification tests carried out.

ЦитироватьRadhakrishnan:

 The much-awaited GSLV launch with the indigenous cryogenic engine is scheduled for August 2013. The vehicle assembly is progressing at Sriharikota. The S-139-tonne booster and the four strap-on liquid stage have already been integrated. The integration of the second stage has already commenced. The cryogenic stage is already at Sriharikota and it is going through various preparations.

Are the high altitude tests and other tests of the cryogenic engine over?

This flight stage has an [cryogenic] engine that has already gone through 200 seconds of testing and the stage is getting ready for assembly with the vehicle. In this mission called GSLV-D5, we are launching a communication satellite called GSAT-14, which will weigh about 2,000 kg. It is an important mission.

Over the last three years, after the flight of GSLV-D3 with India's cryogenic stage, which was unsuccessful, we have done a series of ground tests on the sub-systems and the cryogenic engine at the Liquid Propulsion Systems Centre at Mahendragiri [near Nagercoil in Tamil Nadu] after making the necessary design changes in the fuel booster turbo pump [FBTP] and the oxidiser turbo pump. An important test that was devised this year was testing the FBTP in operating conditions at cryogenic temperatures, which was not done in the past. After doing the test, we wanted to see the ignition of the cryogenic engine in high-altitude conditions. It is called a high altitude test [HAT]. This cryogenic engine had not gone through high-altitude tests earlier.

After the last failure in April 2010, we decided to conduct an HAT and we needed a facility for this. An HAT facility was being established for the development of the high-thrust cryogenic engine required for GSLV-Mark III. That facility was ready and we made modifications to that facility to accommodate the GSLV's cryogenic engine and this was done on a war-footing. After the commissioning of the facility, we successfully carried out two simulated high-altitude tests [of the indigenous cryogenic engine] in March and April 2013. The duration was 3.5 seconds, when the ignition of the main engine, the gas generator and the two steering engines were expected to take place in a given sequence. This happened. This test was done with a stand-by engine, called A-4 engine, which was used for the ground tests. So today we have completed the design changes required for the FBTP based on the failure analysis done after the last flight of the indigenous cryogenic engine.

When the GSLV flight with the Russian cryogenic engine failed in December 2010, there was the problem of the connectors snapping.

That was a different issue. I will come to that. During the April 2010 flight with the indigenous cryogenic engine, the cryogenic engine ignited. The steering engines and the gas generator ignited. But the ignition could not be sustained beyond 800 milli-seconds and the FBTP stopped. So an experts' team went into the possible reasons for this failure and it concluded that there were three possibilities. One was related to the clearances of the three bearings of the FBTP, essentially with respect to the differential contraction taking place in the turbo pump because we are using different materials there at cryogenic temperatures. The second possibility was the failure of the casing of the FBTP acquisition. This essentially required a design change in the FBTP. We have taken care of the first and second possibilities.

To take care of the third possibility, we designed and made in India the propellant acquisition system of the hydrogen tank with the necessary volume. The flight engine that we will be using on GSLV-D5 has already gone through 200 seconds of acceptance tests, and after the tests, the necessary inspection and refurbishment have been done.

So, on the one side, based on various flight tests and results, we have taken concerted action. Secondly, we have done extensive test sequences. Thirdly, the flight acceptance test of the engine has been done. Fourth, we have done vigorous inspection and quality control of the components and sub-systems that will go into the cryogenic engine and the stage. In this flight, we are also using indigenously developed polyimide pipes after due qualification. We used to import them earlier from Russia. This has gone through extensive qualification tests. This pipe was developed at the VSSC. This is with respect to the cryogenic stage.

If you look at the last seven GSLV flights, the first flight was aborted. We, however, had a successful flight within a month. But there was a malfunction in the Russian cryogenic stage and the spacecraft had a life of less than two months. The second and third flights of the GSLV successfully placed GSAT-2 and GSAT-3 into orbit. The GSLV-F02 flight in July 2006 failed because one of the strap-on stages stopped functioning after about 55 seconds. The next mission in September 2007 had a problem: the control system of one of the strap-on stages stopped. The vehicle could place INSAT-4C in orbit with an apogee of 30,000 km only [instead of the targeted 36,000 km]. But we were able to recover the spacecraft and place it in the proper orbit. So I will say that it was a partially successful mission.
 In April 2010, GSLV-D3 was flown with an indigenous cryogenic stage. The lower stages functioned extremely well, that is S-139, the four strap-ons and GS-2. The cryogenic stage ignited but the ignition could not be sustained. That was the failure. The seventh flight, that of GSLV F-06 of December 25, 2010, was a failure due to the opening of a shroud in the Russian cryogenic stage, resulting in two connector sets getting disengaged, because of which signals from the equipment bay could not reach the control actuators of the strap-on stage. So the vehicle started losing control after 47 seconds of flight and we had to destroy the vehicle. The failure analysis committee's [FAC] report was published.

We went through an analysis of all the seven GSLV flights and tried to see what the gaps were that we could fill up. In the GSLV-D5 configuration, we are using a heat-shield with a diameter of 3.4 metres and the spacecraft mass is nearly 2,000 kg. We have incorporated a design change in the way the connectors are mounted in the cryogenic stage. The mounting of connectors is redesigned. We have done extensive aero-structural tests of the GSLV. We have also done wind-tunnel tests on the GSLV model.

Where did you do the wind tunnel tests? In Russia?

Both in Russia and at the National Aerospace Laboratories [NAL], Bangalore. We have done structural testing of the modified connector mounting system. We have analysed the test results of the previous seven flights and necessary corrections have been incorporated.

The Mission Readiness Review [MRR] team, headed by Dr B.N. Suresh, former Director, VSSC, and comprising experts from ISRO, and directors and deputy directors of R & D and academic institutions, has been reviewing the work on the indigenous cryogenic engine preparations for the GSLV-D5 mission for nearly two years. The first task was to finalise the configuration of the GSLV-D5 vehicle, incorporating the changes required which are based on our learning from the previous seven flights. The MRR committee and the Flight Readiness Review committee have been monitoring the realisation of the sub-systems and the vehicle stages as well as the results of the tests that have been carried out, and they have already given the clearance for assembling the vehicle. On January 31, 2013, we started stacking the vehicle.

Similarly, in the cryogenic stage, the MRR committee has been overseeing the incorporation of the corrections and the results of the tests before giving clearance to the flight stage. The flight cryogenic stage was moved from Mahendragiri to Sriharikota on May 13, 2013, and the flight preparations are going on.

ЦитироватьSaturday, June 8, 2013
CUS-5 at High Altitude Test facility (HAT)

(https://img.novosti-kosmonavtiki.ru/87743.jpg)
ISRO cryogenic engine for GSLV D5 at HAT(credits: ISRO)

The image is of CUS-5 engine for the GSLV D5 mission. The engine underwent a simulated vacuum ignition test at ISRO's High Altitude Test facility near Mahendragiri. The test demonstrated the successful simulated vacuum ignition and further build up of required operating parameters for high altitude atmospheric flight. Success of the HAT test will further boost India's cryogenic engine development program. 

ЦитироватьWednesday, June 12, 2013
GSLV MK2 Vehicle latest modifications
 
(https://img.novosti-kosmonavtiki.ru/87744.jpg)
Latest developments related to GSLV MK2 (credit: ISRO)

ЦитироватьАртём Жаров пишет:
Вот и сам GSAT-14. Фото antriksh с NSF

 http://forum.nasaspaceflight.com/index.php?topic=30160.msg1080670#msg1080670

 

ЦитироватьGSLV-D5/GSAT-14 Mission 
Launch sheduled on Aug 19, 2013 from SDSC, SHAR at 16:50 hrs (IST).

ЦитироватьIndigenous cryogenic engine to power GSLV-D5 on Aug. 19
T. S. Subramanian
 
ISRO expects it will perform smoothly this time; earlier one failed in April 2010

As Geo-synchronous Satellite Launch Vehicle (GSLV-D5) is slated to lift off around 5 p.m. on August 19 from Sriharikota, and various checks showing that the vehicle is in the pink of its health, the mood is one of optimism at the spaceport.

Спойлер

The mission's significance is that GSLV-D5 is powered by an indigenous cryogenic engine and Indian Space Research Organisation (ISRO) has used every expertise available in the country to ensure that the engine performs smoothly this time. The rocket will put India's advanced communication satellite called GSAT-14, weighing 1,980 kg, into orbit.

ISRO Chairman K. Radhakrishnan told The Hindu, "The Mission Readiness Review (MRR) has cleared the vehicle. The integration of the satellite with the launch vehicle has been completed. On August 11, we plan to move the vehicle to the launch pad."

There is enormous focus on this mission, as the GSLV flight with an indigenous cryogenic engine failed in April 2010. The subsequent GSLV flight with a Russian cryogenic stage also failed in December of that year.

S. Ramakrishnan, Director of Vikram Sarabhai Space Centre (VSSC) in Thiruvananthapuram, brimmed with confidence when asked whether the indigenous cryogenic engine would perform well this time.

"Of course," he said. "We are doing well. We have done all the possible tests. As of now, the [cryogenic] stage health is fine. All checks show that the health of the vehicle is all right."

It would take about an hour for the 49-metre tall rocket, weighing 414 tonnes, to roll on a one-km long rail track from the 17-storey tall VAB (Vehicle Assembly Building) to the launch pad on August 11. A platform with wheels, on which the three-stage vehicle was stacked up inside the VAB, would ferry the rocket to the launch pad.

Mr. Ramakrishnan said, "Once we go to the launch pad, we will connect the umbilicals. During the final countdown, which will be of the order of 35 hours, the rocket will be filled with propellants. The satellite has already been filled with propellants."

Positive results

M.C. Dathan, Director of the Liquid Propulsion Systems Centre (LPSC), called the August 6 MRR "a wonderful meeting," because "there was no apprehension or anxiety" excepting a couple of minor issues. Tests on the vehicle yielded positive results.

Mr. Dathan asserted "we have made use of every possible expertise available in the country" to ensure that the indigenous cryogenic engine performed flawlessly. This included expertise from the academic institutions, and research and development centres.

In April 2010, the indigenous cryogenic engine ignited; the steering engine and the gas generator ignited, but the ignition could not be sustained beyond 800 milliseconds and the fuel booster turbo pump (FBTP) stopped.

Dr. Radhakrishnan elaborated on the steps taken to address the inadequacies of the 2010 flight. He said, "Over the last three years... we have done a series of ground tests on the sub-systems and the cryogenic engine" at the LPSC at Mahendragiri, Tamil Nadu, "after making the necessary design changes in the FBTP and the oxidiser turbo pump." An important test done this year was testing the FBTP in operating conditions at cryogenic temperatures. Ignition of the engine in high-altitude conditions [simulating the vacuum in space] was also done. The duration of this test was 3.5 seconds, when the ignition of the main engine, the gas generator and the two steering engines should take place in a given sequence. "This happened."

[свернуть]

Цитироватьinput~2 пишет:

(https://img.novosti-kosmonavtiki.ru/28248.jpg)

ЦитироватьLatest Updates - Aug 18, 2013
Second Stage Propellant filling operation commenced & is normal
29 hour countdown started at 11:50 hrs (1ST) and is normal

ЦитироватьIndian space science at threshold of a new age as GSLV-D5 countdown begins
By Arun Ram, TNN | 18 Aug, 2013, 01.11PM IST

CHENNAI: Indian space science is waiting at the threshold of a new phase of mega satellite launches and exploration as the countdown for the GSLV-D5 rocket launch began at 11.50am on Sunday. Twenty-nine hours later, at 4.50pm on Monday, the rocket carrying telecommunication satellite GSAT-14 will lift off from Sriharikota, 100km north of Chennai.

GSAT-14, which weighs 1,982kg, will be used for telecast and telecommunication.

What makes the launch crucial for the nation is the use of an indigenous cryogenic engine as the upper stage. The first attempt to use an indigenous cryogenic engine on April 15, 2010 to power GSLV-D3 was a failure. With only one more Russian cryogenic engine left in the Isro arsenal, success of the indigenous technology using oxygen and hydrogen in extreme low temperatures as the fuel will propel several big ticket future missions including a manned project to space.

Isro senior scientists led by chairman K Radhakrishnan are monitoring GSLV-D5, whose strap-boosters started getting fuelled soon after the countdown. Liquid propellants are being filled into the second stage. Liquid hydrogen and liquid oxygen, which fuel the cryogenic engine will be filled around 9am on Monday. Scientists at the Satish Dhawan Space Centre told TOI that the rocket's health and weather conditions were fine.

India needs cryogenic engines to launch GSLVs that can carry payloads weighing more than three tonnes, which hold the key to future of telecommunication and space exploration. GSLV-D5 weighs 414 tonnes.

Since 1994, India has had 23 consecutive successes with the Polar Sateliite Launch Vehicles (PSLVs), an improvised version of which was used for Chandrayaan-1 in August 2009. However, PSLVs can carry only payloads weighing up to 1.5 tonnes to a geosynchronous transfer orbit (a highly elliptical orbit with the nearest point to earch about 200km and the farthest 42,00km) , and up to 3.5 tonnes to a low earth orbit of about 200km from earth. GSLV can carry payloads weighing 2.5 tonnes to a geosynchronous transfer orbit, and up to 5 tonnes to a low earth orbit.

ЦитироватьПалкин пишет:
Прямая трансляция будет?

ЦитироватьAug 19, 2013

 Third Stage Cryogenic Propellant filling operation is in progress.
 Preparations for Third Stage Cryogenic Propellant filling operation are in progress.
 Propellant filling operation of First Stage Strap-Ons is completed.

Aug 18, 2013

 Propellant filling operation of First Stage Strap-Ons is under progress.
 Second Stage Propellant filling operation is completed.
 Second Stage Propellant filling operation is under progress and is normal.
 Second Stage Propellant filling operation commenced.
 The 29 hour countdown started at 11:50 hrs (IST) and is normal.

ЦитироватьАртём Жаров пишет:

ЦитироватьПалкин пишет:
Прямая трансляция будет?

Да, обещают за 35 минут до запуска.

 http://www.isro.org/scripts/livewebcast.aspx

ЦитироватьISRO says the launch countdown is on hold.

ЦитироватьLeak in the fuel system of the second stage of the GSLV

ЦитироватьПалкин пишет:
Да, на час сорок. Примерно в пять Мск теперь.

ЦитироватьЛаниста пишет:
У меня тут розовая рябь //хттп://щебцаст.гов.ин/ливе/
у вас норм показывает?

ЦитироватьLanista пишет:
У меня тут розовая рябь http://webcast.gov.in/live/
у вас норм показывает?

ЦитироватьGalactic Penguin SST пишет:
Apparently launch will be delayed >1 week as the rocket will be rolled back and de-stacked.

ЦитироватьLaunch of GSLV D5 carrying GSAT 14 has been cancelled. We observed a leak in the fuel system of the second stage of the vehicle, revised launch date of GSLV D5 will be announced later.

Dr. K. Radhakrishnan
Chairman of the Space Commission and ISRO

Цитировать

Цитироватьazeast пишет:
Lift off!

azeast пишет:
300 сек полёта

ЦитироватьSalo пишет:
Какую траву Вы курите?

Цитироватьazeast пишет:

ЦитироватьSalo пишет:
Какую траву Вы курите?

Пардон, по этой ссылке зашёл, а вроде прямой репортаж http://www.isro.org/scripts/livewebcast.aspx

Цитироватьazeast пишет:

ЦитироватьSalo пишет:
Какую траву Вы курите?

Пардон, по этой ссылке зашёл, а вроде прямой репортаж http://www.isro.org/scripts/livewebcast.aspx

ЦитироватьLanista пишет:
PSLV-C21 Launch from Satish Dhawan Space Center (SDSC), Shriharikota, India (09.09.2012)

ЦитироватьGSLV-D5 Launch Called-Off

The Launch of the GSLV-D5 scheduled for 1650 hrs today (August 19, 2013) is called off, as a leak is observed in the UH25 fuel system of the liquid second stage during the pre-launch pressurisation phase on the vehicle just two hours before the scheduled lift-off. 

The propellants are being drained from the Cryogenic Stage, Liquid Second Stage and the four liquid Strap-ons of GSLV-D5. The vehicle will be moved back to the Vehicle Assembly Building for further actions. 

The revised launch date will be announced after a detailed assessment.

ЦитироватьISRO will look at options of using a standby second stage engine for the early launch of GSLV D5 after examining what forced the postponement of the launch on Monday.

" We have a standby for the second stage engine. But first we have to study the problem. If the problem is due to a faulty component, then we have to look at the batch to which the component belonged and have to replace the entire components from that batch, there was no point in replacing an engine with another faulty one. If the problem is external, it will be easy to correct. But if it is internal, then the engine may have to be dismantled. "

GSLV D5 Mission Assurance Team

ЦитироватьGSLV relaunch will take several months
 
  By Express News Service - THIRUVANANTHAPURAM
 Published: 23rd August 2013 10:15 AM
 
  It would be at least two months before the Geosynchronous Satellite Launch Vehicle D5 (GSLV D5) blasts off from Sriharikota despite a dismayed Indian Space Research Organisation (ISRO) working overtime to figure out what went wrong last Monday.
"Even if the defect is found to be a minor one, it would take at least two months. The stages (GSLV is a three-stage rocket) have to be dismantled for examination. If it's a major problem, it might take longer,'' an ISRO source said from Sriharikota.
Another factor that will have a say in deciding the new launch date is the forthcoming north-east monsoon. The August 19 launch had to be aborted less than two hours to lift-off after a fuel leak was detected in the second stage.

ЦитироватьGSLV-D5 probe to begin on Monday
Bangalore, Chethan Kumar, Aug 23, 2013, DHNS:

Scientists working on the Geosynchronous Satellite Launch Vehicle-D5 (GSLV-D5), the launch of which had to be postponed earlier this month after a leakage was spotted in the second stage, have said that there is no major glitch with the vehicle prima facie, but a clear picture would emerge only after Monday.

Sources at the Indian Space Research Organisation (Isro) said: "Primary checking has only detected the leak, and there seem to be no other problem."

Another source said that a thorough probe would be initiated on Monday, when the launch vehicle would be taken to the vehicle assembly building in Sriharikota.

"Right now, the spacecraft is sitting on top of the vehicle at the launch pad. All the propellants have been drained out and the vehicle has to be decontaminated for safety reasons. After this, it would be moved back to the vehicle assembly building," he said.
Stating that the spacecraft would be separated fr om the vehicle on Monday and shifted to the clean room, he said the inspection would then begin in the assembly building, wh ere scientists would have access to the various stages.

The launch vehicle has three stages: core stage plus strap-ons, the liquid stage and the cryogenic stage.

The leakage was detected in the second stage on August 19, when the vehicle was to put into space the GSAT-14.

While Isro can fix another date for the launch only after the inspection and correction, the failure of the GSLV continues to haunt the space agency.

ЦитироватьSalo пишет:
Пока мы только разбираем ракету, начиная с понедельника.  ;)

ЦитироватьThe Indian space agency will assemble another engine to fly its heavy rocket geosynchronous satellite launch vehicle (GSLV), while packing off the leaking one to its Liquid Propulsion Systems Centre (LPSC) for detailed study, an official said Tuesday.

The Indian Space Research Organisation (ISRO) had called off the launch of its GSLV rocket carrying the communication satellite GSAT-14 Aug 19 after the liquid fuel started leaking like a tap from the rocket's second stage.

ISRO's spaceport is located at Sriharikota in Andhra Pradesh, around 80 km from here. The LPSC is situated at Mahendragiri in Tamil Nadu.

The GSLV is a three-stage launch vehicle with four strap-on motors hugging the first stage.

The first stage is powered by solid fuel while the four strap-on motors and the second stage are powered by liquid fuel. The third is the cryogenic engine powered by liquid hydrogen and liquid oxygen.

"At the rocket assembly building, the satellite, cryogenic engine and the second stage have been destacked. It has been decided to shift the second stage to Mahendragiri for detailed inspection and study," the ISRO official told IANS.

He said ISRO has also decided to start assembling another engine so that the GSLV could fly at the earliest.

Queried about the time-frame for the GSLV's flight, he said: "It is not possible to give a time-frame for the GSLV's flight now."

In 2010, ISRO had to put off a PSLV launch as it found "a marginal drop in the pressure in the second stage of the vehicle during mandatory checks".

At that time, the faulty part was inaccessible as the rocket stages had been fully assembled. ISRO had to dismantle the second stage to correct the fault.

In June this year, ISRO put off the launch of its PSLV rocket carrying India's first navigational satellite after it found a problem in one of the electro-hydraulic control actuators in the second stage.

Here again, the fully-assembled rocket had to be dismantled to replace the actuator, an assembly of several components. The launch occurred successfully July 1.

However, ISRO officials told IANS that a pattern could be drawn only if the problem crops up consistently in a component/system.

-
Chennai | AUGUST 27, 2013

ЦитироватьBangalore, August 28, 2013
Updated: August 28, 2013 18:24 IST
GSLV flight with indigenous cryogenic engine only in Dec: ISRO
PTI

The flight-test of GSLV with indigenous cryogenic engine, called off ten days ago following a leak in the second stage of the rocket, is now expected to take place only in December, Indian Space Research Organisation said on Wednesday.

ISRO has started the process of de-stacking the rocket and the second stage would be shifted to Liquid Propulsion Systems Centre (LPSC), a facility of the space agency located at Mahendragiri in Tamil Nadu, for an investigation into the cause of the leakage.

The launch of the GSLV-D5, scheduled for 1650 hrs on August 19 fr om the Sriharikota spaceport was called off, as a leak was observed in the UH25 fuel system of the liquid second stage during the pre-launch pressurisation phase on the vehicle just two hours before the scheduled lift-off.

The propellants were later drained from the cryogenic stage, liquid second stage and the four liquid Strap-ons of GSLV-D5. The rocket was moved back to the vehicle assembly building.

An ISRO official told PTI in Bangalore on Wednesday that the first and third stage of GSLV would be "preserved" while the second stage would have be built again, a process which has already started.

ISRO would be busy with the Mars Orbiter mission in the next two months. "We can expect the GSLV flight in December", the official said.

ISRO has drawn flak from some quarters for using an "old tank" for the second stage as the materials used for building it were "prone for delayed cracks". It was said have been delivered to ISRO four-years ago and was to be the last in the series of the kind that ISRO planned to use.

A senior space scientist called it a "gross error of judgement" on the part of ISRO which obviously seemed to focus more on the third (cryogenic) stage, as the first two were a "given" as it's similar to the proven PSLV, the workhorse launcher.

GSLV is a three stage vehicle that is 49 metre tall, with 414 tonne lift-off weight. First stage comprises S125 solid booster with four liquid (L40) strap-ons. Second stage (GS2) is liquid engine and the third stage (GS3) is a cryostage.

The final/third stage of GSLV is the cryogenic stage, which is more efficient compared to the liquid stage in PSLV.

This means that the thrust developed by burning each kg of propellant is higher in cryo engine, hence can place larger payloads with higher weight into orbit.

"Cryo stage as final stage is hence essential for a launcher with higher payload capacity", an ISRO official said.

PSLV is capable of launching 1600 kg satellites in 620 km sun-synchronous polar orbit and 1050 kg satellite in geo-synchronous transfer orbit (GTO).

"This poses a serious lim itation on launching communication satellites which are heavier. The GSLV will be capable of launching satellites which are 2000 kg-2500kg which matches with the GSAT class of Communication satellites", it was noted.

Currently, India is forced to outsource the launch services from abroad which are not a cost effective solution. The establishment of a proven GSLV launcher is the need of the hour. The successful development of indigenous cryo stage will boost India's confidence in terms of its self-reliance in the launch capability, ISRO officials said.

ЦитироватьIsro to make new stage for GSLV
Bangalore, Sep 13, 2013, DHNS:

The high-level task team constituted to probe the August 19 failure of the Geosynchronous Satellite Launch Vehicle-D5 (GSLV-D5) is yet to submit the final report on the reasons for the glitch, but the Indian Space Research Organisation (Isro) has decided to assemble a new second stage for the rocket.

A senior Isro official, while stating that the exact date for the launch of GSLV-D5 can only be set in November, added that the launcher would be launched into space in December, carrying the GSAT-14.

"Going by the availability of hardware and components, the GSLV assembly and checkout is expected to be completed at the vehicle assembly building by the first week of December," said a note issued by Isro.

"Although the exact reasons for the leakage in the second stage of the engine, which prevented the launch on August 19, are being probed by the team headed by K Narayanan, it has been decided that a new liquid second stage (GS-2) will be assembled to replace the leaked stage," said the official.

He added that the process of assembling has begun, and that besides the GS-2, all the four liquid strap-on stages are being replaced with new ones.

Another official, while stating that the team is also inspecting the first stage (solid) and core base shroud, added that if any of the elements are found to be affected, "we will replace even those".

"The satellite assembly, avionics equipment bay and the cryogenic stage will be preserved, following prescribed practices," said an official note issued by Isro.

ЦитироватьGSLV- D5 to be launched in December: Isro head

TNN Sep 28, 2013, 02.42AM IST

KOZHIKODE: The launch of the GSLV- D5, which was aborted the last minute following a fuel leak in the second stage of the rocket last month, will take place on December 15, Indian Space Research Organisation (Isro) chairman, K Radhakrishnan said here on Friday.
 The launch of GSLV-D5, featuring an indigenous cryogenic engine, had to be called off during the last lap of the countdown due to a leak detected in the fuel system of the rocket's liquid second stage on August 19.

ЦитироватьGSLV D5 ready for launch on December 15: ISRO Chairman
PTI : Kozhikode(Kerala), Fri Sep 27 2013, 22:01 hrs

The launch of Geosynchronous Satellite Launch Vehicle (GSLV), which was deferred on August 19 following a flaw in the rocket, will take place on December 15, Indian Space Research Organisation chariman Dr K Radhakrishnan said on Friday.

"The launch of GSLV D5 satellite which was postponed on August 19 about two hours before liftoff after detection of a fuel leak in the rockets' second stage will now be held on December 15," ISRO chairman Dr K Radhakrishnan said at an interactive session with students and teachers at Kozhikode.

GSLV is a three-stage engine rocket. The first stage is fired with solid fuel, the second is the liquid fuel and the third stage is the cryogenic engine. Geosynchronous satellites are placed in orbits 36,000 km above the earth.

ЦитироватьPreparations in full swing for December 15 GSLV mission
  By PTI - BANGALORE
 Published: 05th November 2013 04:49 PM
 Last Updated: 05th November 2013 04:49 PM
 
  Even as ISRO successfully launched the Mars Orbiter Mission (MOM), preparations are in full swing for flight-testing of GSLV with indigenous cryogenic engine, a key step to boost the country's confidence in terms of its self-reliance in launch capability, on December 15.

"We have put all our efforts for the development of GSLV", ISRO Chairman K Radhakrishnan said. "The assembly of GSLV is going on at Sriharikota. It started on October 18. Now, the launch is scheduled for December 15th".

The maiden flight testing of the indigenous cryogenic engine and stage conducted in GSLV-D3 on April 15, 2010, failed.

ISRO made another attempt on August 19 this year but the the launch was called off as a leak was observed in the UH25 fuel system of the liquid second stage during the pre-launch pressurisation phase on the vehicle just two hours before the scheduled lift-off.

GSLV is a three stage vehicle. GSLV is 49 metre tall, with 414 tonne lift off weight. First stage comprises S125 solid booster with four liquid (L40) strap-ons. Second stage (GS2) is liquid engine and the third stage (GS3) is a cryostage.

The cryostage is more efficient compared to the liquid stage in PSLV. This means that the thrust developed by burning each kg of propellant is higher in cryo engine, hence can place larger payloads with higher weight into orbit. "Cryo stage as final stage is hence essential for a launcher with higher payload capacity", an ISRO official said.

PSLV is capable of launching 1600 kg satellites in 620 km sun-synchronous polar orbit and 1050 kg satellite in geo-synchronous transfer orbit (GTO).

"This poses a serious limitation on launching communication satellites which are heavier. The GSLV will be capable of launching satellites which are 2000 kg - 2500 kg which matches with the GSAT class of Communication satellites", it was noted.

Currently, India is forced to outsource the heavy launch services from abroad which is not a cost effective solution The establishment of a proven GSLV launcher is the need of the hour. The successful development of indigenous cryostage will boost India?s confidence in terms of its self reliance in the launch capability, ISRO officials said.

ЦитироватьMars mission launched, ISRO now gears up for Dec 15 GSLV test flight
 PTI (http://www.indianexpress.com/columnist/ptindia/) : Bangalore, Tue Nov 05 2013, 19:43 hrs

Even as ISRO successfully launched the Mars Orbiter Mission (MOM), preparations are in full swing for flight-testing of GSLV with indigenous cryogenic engine, a key step to boost the country's confidence in terms of its self-reliance in launch capability, on December 15.

"We have put all our efforts for the development of GSLV", ISRO Chairman K Radhakrishnan said. "The assembly of GSLV is going on at Sriharikota. It started on October 18. Now, the launch is scheduled for December 15th".

The maiden flight testing of the indigenous cryogenic engine and stage conducted in GSLV-D3 on April 15, 2010, failed.

ISRO made another attempt on August 19 this year but the the launch was called off as a leak was observed in the UH25 fuel system of the liquid second stage during the pre-launch pressurisation phase on the vehicle just two hours before the scheduled lift-off.

GSLV is a three stage vehicle. GSLV is 49 metre tall, with 414 tonne lift off weight. First stage comprises S125 solid booster with four liquid (L40) strap-ons. Second stage (GS2) is liquid engine and the third stage (GS3) is a cryostage.

The cryostage is more efficient compared to the liquid stage in PSLV. This means that the thrust developed by burning each kg of propellant is higher in cryo engine, hence can place larger payloads with higher weight into orbit. "Cryostage as final stage is hence essential for a launcher with higher payload capacity", an ISRO official said.

PSLV is capable of launching 1600 kg satellites in 620 km sun-synchronous polar orbit and 1050 kg satellite in geo-synchronous transfer orbit (GTO).

"This poses a serious limitation on launching communication satellites which are heavier. The GSLV will be capable of launching satellites which are 2000 kg-2500 kg which matches with the GSAT class of Communication satellites", it was noted.

ЦитироватьISRO's GSLV D5 launch likely early next month
PTI Dec 3, 2013, 11.59AM IST

CHENNAI: ISRO today announced that the launch of Geosynchronous Satellite Launch Vehicle GSLV D5, which was called off at the 11th hour on August 19 due to a fuel leak in its second stage, is likely in the first week of January next year.

"After carrying out all preparatory works, the launch of GSLV D5 is likely by the first week of January next year. The exact date and time is yet to be fixed," ISRO sources told PTI.

The integration of the second stage of GSLV D5 has already been completed and integration of the cryogenic stage is planned on December 9, they said.

"After completing all other procedures, the vehicle is scheduled to be brought to the launch pad on December 28. We need at least a week for the launch after the vehicle in brought to the pad," they added.

The launch of GSLV-D5 scheduled at 1650 hours on Aug 19 was called off at Satish Dhawan Space Centre at Sriharikota, some 100 km from here, after a leak was detected in the fuel system of the liquid second stage in pre-launch pressurisation phase on the vehicle, just two hours before lift-off.

The propellants were later drained from the cryogenic stage, liquid second stage and the four liquid strap-ons of GSLV-D5 and the vehicle was moved back to the Vehicle Assembly Building in SDSC.

Цитироватьinput~2 пишет:
Local newspaper in Telugu says launch set for January 5 (LT)
(source (http://www.andhrabhoomi.net/node/119377))

ЦитироватьGSLV-D5 is all set to soar the skies off Sriharikota space-port. The launch is targeted on 1618 hrs of January 5, 2014...

Цитировать(https://img.novosti-kosmonavtiki.ru/87916.jpg)
Nozzle End Segment of GSLV-D5 First Stage being placed on the Mobile Launch Pedestal

(https://img.novosti-kosmonavtiki.ru/87917.jpg)
(https://img.novosti-kosmonavtiki.ru/91232.jpg)
One of the segments of GSLV-D5 First Stage being hosited during Vehicle Integration

(https://img.novosti-kosmonavtiki.ru/87919.jpg)
(https://img.novosti-kosmonavtiki.ru/87918.jpg)
Two Segments of the GSLV-D5 First Stage are being joined together at the Vehicle Assembly Building

(https://img.novosti-kosmonavtiki.ru/87920.jpg)
(https://img.novosti-kosmonavtiki.ru/87921.jpg)

(https://img.novosti-kosmonavtiki.ru/87922.jpg)
One of the Strap-on Motors of GSLV-D5 being integrated with the GSLV-D5 Core Stage

(https://img.novosti-kosmonavtiki.ru/87923.jpg)
GSLV-D5 Core Stage with four Strap-Ons at the Vehicle Assembly Building

(https://img.novosti-kosmonavtiki.ru/91233.jpg)
Hoisting of GSLV-D5 Second Stage during Vehicle Assembly

(https://img.novosti-kosmonavtiki.ru/91234.jpg)
Indigenous Cryogenic Upper Stage being lifted from its transporter at the Vehicle Assembly Building

(https://img.novosti-kosmonavtiki.ru/91235.jpg)
Indigenous Cryogenic Upper Stage is being integrated with GSLV-D5 Second Stage

[/li]
• The Mission Readiness Review (MRR) team and the Launch Authorisation Board (LAB) have cleared the GSLV-D5/GSAT 14 launch at 16:18 hrs (IST) on Jan 05, 2014
• The vehicle is moved from the vehicle assembly building to the umbilical tower (the launch pad) in the morning of Dec 28, 2013
• A 29-hour countdown is set to commence on Jan 04, 2014 at around 11 hrs (IST)
  

ЦитироватьWill 2014 place ISRO in cryo club?
Madhumathi D. S.
 
 Will 2014 see a 20-year-old Indian space dream come true? January 5 should tell whether years of ISRO's toil and tears will fructify and usher India into a sel ect club of countries — those with their own cryogenic rocket engine technology, which can launch their communication satellites from their soil.
Space agency ISRO, flush fr om launching its Mars Orbiter Mission, will face its acid test on Sunday when it flies the GSLV-D5 launch vehicle with the indigenously built cryogenic upper third stage. To succeed, the launcher must place GSAT-14, a two-tonne-class satellite, in the planned orbit.
ISRO Chairman K. Radhakrishnan told The Hindu that the GSLV flight with an indigenous cryogenic stage would be a priority mission for 2014.
The upcoming launch is said to be extremely vital for the organisation morally and operationally. The first such bid failed in April 2010. A second attempt was called off in August 2013, an hour before the launch, after a fuel leak was detected. In the last four or so months, the organisation had done everything to ready a "refurbished" vehicle, Dr. Radhakrishnan said. Significant changes were made, including new fuel tanks, systems and material, based on the recommendations of the K. Narayana committee that went into the August leak episode.
The teams started re-assembling the current vehicle on October 18, 2013. The three-stage GSLV rocket has a first stage (S139) propelled by solid fuel; its four strap-on (L40) boosters use liquid fuel. The second stage GS2 uses liquid propellants. The third cryo stage uses liquid hydrogen and liquid oxygen. While D5's cryo stage was found healthy after August, ISRO had to work anew on the other two.
Dr. Radhakrishnan said: "We got a new S139 solid first stage. Its four liquid strap-on stages have a lot of avionics, so we refurbished them at Mahendragiri and Hindustan Aeronautics Ltd. We also made a new second stage. When the launch was called off in August, the liquid stage had to be drained of fuel and washed with much water. This might have affected the electronics systems, so we replaced them, too."
More importantly, the fuel tank material has been changed, fully phasing out the traditional but corrosion-prone aluminium-zinc combine, called AFNOR 7020. The new alternative, aluminium-copper alloy called AA2219, is now the material for all PSLV and GSLV tanks.

Цитировать(https://img.novosti-kosmonavtiki.ru/91326.jpg)
Fully integrated GSLV-D5 in the Vehicle Assembly Building

(https://img.novosti-kosmonavtiki.ru/91327.jpg)
GSLV-D5 being moved from Vehicle Assembly Building to Launch Pad

(https://img.novosti-kosmonavtiki.ru/91328.jpg)
GSLV-D5 moving towards Launch Pad

(https://img.novosti-kosmonavtiki.ru/91329.jpg)
GSLV-D5 at the Second Launch Pad (Umbilical Tower)

[/li]
• Propellant filling operation of GLSV-D5 Strap Ons is under progress
• Preparations for Propellant filling operation of GLSV-D5 Strap Ons is under progress
• GSLV-D5 Second Stage (GS2) Propellant filling operation is completed by 18:00hrs (IST)
• GSLV-D5 Second Stage (GS2) Propellant filling operation is under progress
• Preparations for GSLV-D5 Second Stage (GS2) Propellant filling operation commenced at 11:48 hrs (IST)
• The 29 hour countdown started at 11:18 hrs (IST) and is in progress
  

ЦитироватьThe successful launch of India (http://www.business-standard.com/search?type=news&q=India)'s heavier rocket - the geosynchronous satellite launch vehicle-D5 (GSLV-D5) - Sunday not only means the indigenous cryogenic engine is performing well but also would pave way for sizeable savings, the space agency's chief said Saturday.

"When GSLV-D5 succeeds in its mission Sunday, it means the Indian cryogenic stage/engine is performing well. It is a culmination of major indigenous technology development," Indian Space Research Organisation (ISRO) chairman K.Radhakrishnan told IANS.

In addition, the mission's success would not only pave way for ISRO to save launch costs paid to foreign space agencies but also to launch more communication satellites augmenting the transponder capacity to earn more revenue, he added.

Radhakrishnan said the country pays around $85-90 million or around Rs.500 crore as launch fee for sending up a 3.5 tonne communication satellites whereas the GSLV rocket costs around Rs.220 crore and the GSAT-14 that would go up Sunday evening costs around Rs.145 crore.

The ISRO can send smaller communication satellites - weighing around two tonnes - till such time it gets ready an advanced GSLV variant that can lug satellites weighing around four tonnes.

While that is for the future, Radhakrishnan said ISRO has lined up several satellite launches for the current GSLV rocket version.

"We will be launching satellites GSAT-6, 7A, 9 using GSLV. We will also be using this rocket for our second Chandrayaan mission and for the launch of GISAT," he said.

According to him, another communication satellite GSAT-15 will be launched using the Ariane rocket.

Other than the flight testing of cryogenic engine, 2014 will be an important year for ISRO.
Radhakrishnan noted that in September, the Mars Orbiter will be injected into the Mars orbit while the test flight of GSLV-Mark III version will also include a crew module for characterisation of re-entry from the space.

"The GSLV-Mark III experimental mission will be in April this year. The rocket will have a passive cryogenic stage/engine. The main purpose of the mission is to study the aerodynamics and stability of the rocket," he said.

He said the cryogenic engine for the next GSLV version will take around three years for being flight ready.

According to him, the next fiscal (April 2014-March 2015) would see ISRO launching three IRNSS (Indian Regional Navigational Satellite System) satellites taking the total to four and be ready for usage.

He said ISRO will also launch French satellite SPOT-7 along with four small satellites using its other rocket Polar Satellite Launch Vehicle (PSLV).

Radhakrishnan said ISRO plans to induct around 96 transponders (receivers and transmitters of signals),next fiscal. Currently it has 195 transponders.

Queried about the Mars Orbiter that was launched last year, he said the satellite health is good and it is around 8.5 million kilometer from earth.

"The next orbit maneuver (course correction) will be in April," he said.

http://www.business-standard.com/article/news-ians/gslv-rocket-s-success-will-mean-immense-savings-isro-chief-114010400550_1.html

ЦитироватьJan 05, 2014

    Propellant filling operation of GSLV-D5 Strap Ons is completed

ЦитироватьJan 05, 2014

 

[/li]
• Preparations for Propellant filling operation of GSLV-D5 Cryo Stage is under progress
  
   
• Propellant filling operation of GSLV-D5 Strap Ons is completed
  

Цитировать(https://img.novosti-kosmonavtiki.ru/91359.jpg)
GSLVD5 with GSAT14 enclosed in its heat shield in Second Launch Pad (SLP)

ЦитироватьJan 05, 2014                                                                               

[/li]
• Propellant filling operation of GSLV-D5 Cryo Stage has commenced at 11:42 hrs (IST). Chilling and filling of Liquid Oxygen (LOX) into Cryo Stage is in progress
  

ЦитироватьA0011/14 - REF CHENNAI NOTAM A2542/13. GSLV-D5-II ROCKET LAUNCH FM SHAR RANGE, SRIHARIKOTA, INDIA IS SCHEDULED ON 05 JANUARY 2014 BTN 1000-1330UTC. ATC MAY RE-ROUTE TRAFFIC DURING THE PERIOD AS PER ROUTINGS GIVEN IN THE ABOVE NOTAM. LAUNCH WINDOW FOR THE REMAINING PERIOD FROM 06 JANUARY TO 31 JANUARY 2014 SHALL BE KEPT ALIVE FOR RESCHEDULING OF LAUNCH IF REQUIRED. GND - UNL, 05 JAN 10:00 2014 UNTIL 05 JAN 13:30 2014. CREATED: 03 JAN 10:14 2014

A2542/13 - GSLV D5 II ROCKET LAUNCH FM SHAR RANGE, SRIHARIKOTA WILL TAKE PLACE AS PER FLWG DETAILS. THE LAUNCH WILL BE ON ANY ONE OF THE DAY DURING THIS PERIOD ACTUAL DATE OF LAUNCH WILL BE INTIMATED 24 HRS IN ADV THROUGH A SEPARTE NOTAM. LAUNCH PAD COORD 1343.2N 08013.8E NO FLT IS PERMITTED OVER THE DNG ZONE.
I.DNG ZONE - 1 IS A CIRCLE OF 15 NM RADIUS AROUND THE LAUNCHER.
II. DNG ZONE - 2 IS A RECTANGLUR AREA BOUNDED BY 1115N 08510E 1115N 08655E 1245N 08655E 1245N 08510E
III. DNG ZONE - 3 IS A RECTANGLUR AREA BOUNDED BY 1020N 08830E 1020N 09030E 1150N 09030E 1150N 08830E
IV. DNG ZONE - 4 IS A RECTANGLUAR AREA BOUNDED BY 0815N 09500E 0815N 09600E 0945N 09600E 0945N 09500E. 1000-1330 DLY, 05 JAN 10:00 2014 UNTIL 31 JAN 13:30 2014. CREATED: 24 DEC 14:36 2013

ЦитироватьJan 05, 2014                                                                               

[/li]
• Propellant filling operation of GSLV-D5 Cryo Stage is in progress. Chilling and filling of Liquid Hydrogen (LH2) into Cryo Stage is in progress
  

Цитировать0915 GMT (4:15 a.m. EST)
Today's mission marks the eighth launch of a Geosynchronous Satellite Launch Vehicle since 2001, and the third flight of the upgraded GSLV Mk.2 version with an Indian cryogenic third stage.

Six of the GSLV's seven missions to date have flown with Russian-built hydrogen-fueled third stage engines, but India attempting to demonstrate its own cryogenic third stage to give the nation a launcher with all-Indian components.

The first GSLV launch occurred on April 20, 2001, with the GSAT 1 satellite. The mission was a partial success, delivering its payload to a slightly lower-than-planned orbit due to the premature shutdown of the rocket's Russian third stage.

Two subsequent launches of the GSLV in May 2003 and September 2004 proved successful before the GSLV was hamstrung by a series of mishaps.

A launch in July 2006 ended when the GSLV veered out of control and disintegrated about 55 seconds after liftoff due to a malfunctioning propellant regulator inside one of four liquid-fueled strap-on boosters, which allowed excess propellant to flow into the Vikas engine, driving up temperatures and pressures inside the engine.

The next GSLV mission in September 2007 placed the INSAT 4CR communications satellite in orbit, but the rocket's third stage again underperformed, deploying the spacecraft in the wrong orbit.

India followed with another GSLV launch in April 2010, the first time the launcher had ever used an Indian-built third stage. The rocket fell short of orbit due to a fuel pump anomaly on the indigenous cryogenic upper stage.

Another GSLV launch in December 2010, which reverted back to using the Russian third stage, disintegrated in a fireball less than a minute after liftoff, when cables between the launcher's computer and strap-on boosters inadvertently disconnected in flight, causing the GSLV to lose control.

ISRO considers four of the seven GSLV missions to date to be failures.

0735 GMT (3:35 a.m. EST)
The GSLV's third stage is now being filled with liquid hydrogen fuel, according to ISRO.

0620 GMT (1:20 a.m. EST)
Super-cold liquid oxygen is now being pumped inside the Geosynchronous Satellite Launch Vehicle's cryogenic third stage, a key part of today's test launch from the Satish Dhawan Space Center.

The third stage is the only part of the GSLV not already loaded with propellant. Its liquid hydrogen tank will be filled next. The third stage tanks will contain more than 28,000 pounds of propellant at the time of launch.

After the 161-foot-tall rocket rolled to the launch pad Dec. 28, engineers completed final preparations on the launch vehicle and commenced the 29-hour countdown at 0548 GMT (12:48 a.m. EST) Saturday.

Later Saturday, the GSLV's second stage and four L40H strap-on boosters were loaded with hydrazine and nitrogen tetroxide propellants.

The second stage and four strap-on boosters are powered by hydrazine-fueled Vikas engines, each producing about 150,000 pounds of thrust.

The GSLV's first stage is powered by a solid-fueled motor generating more than a million pounds of thrust. Its propellant was packed inside the motor casing before the rocket was assembled.

Fueling of the third stage comes last in the sequence because its cryogenic propellant is stored at frigid temperatures, and the liquid oxygen and liquid hydrogen boils off when exposed to ambient temperatures.

ЦитироватьToday's mission marks the eighth launch of a Geosynchronous Satellite Launch Vehicle since 2001, and the third flight of the upgraded GSLV Mk.2 version with an Indian cryogenic third stage.

Цитировать0948 GMT (4:48 a.m. EST)
 T-minus 60 minutes. No problems have been reported so far in the countdown. Here are some statistics on today's flight:

[/li]
• 8th GSLV launch since 2001
• 2nd GSLV Mk.2 launch since 2010
• 41st Indian space launch since 1979
• 24th geostationary communications satellite launched by ISRO
  

Цитироватьche wi пишет:
 
возможные ссылки на трансляцию:
 http://webcast.gov.in/live/
 http://live.indiatimes.com/
 http://www.livestream.com/spaceflightnow/

Цитировать1038 GMT (5:38 a.m. EST)
 T-minus 10 minutes. At the time of launch, the GSLV will weigh 414 metric tons, or about 912,000 pounds. It will fly southeast fr om the Satish Dhawan Space Center, a facility on Sriharikota Island about 50 miles north of Chennai on India's east coast.
The payload for this launch is GSAT 14, a 4,369-pound Indian communications satellite. GSAT 14 will extend India's Ku-band and C-band communications capacity with 12 transponders, along with a pair of Ka-band beacons for frequency attenuation studies.
After three orbit-raising maneuvers with its on-board engine and deployment of its solar panels and two antennas, the satellite will be positioned in geostationary orbit at 74 degrees east longitude for a 12-year mission.
GSAT 14 will be positioned near other Indian satellites, such as INSAT 3C, INSAT 4CR and Kalpana 1, according to ISRO. The spacecraft also carries several technological experiments, including a fiber optic gyroscope, an active pixel sun sensor and new types of thermal coatings.
         
1033 GMT (5:33 a.m. EST)
 T-minus 15 minutes. Unlike many rockets utilizing strap-on boosters, the GSLV's first stage is powered by a core solid-fueled motor and four liquid-fueled booster engines. The rocket will generate a total thrust of more than 1.5 million pounds at liftoff.
The S139 core motor and Vikas engines on the boosters will jettison and two-and-a-half minutes after liftoff, yielding to the GSLV's second stage Vikas engine for a more than two-minute burn, during which the rocket's 11.1-foot-diameter metallic payload fairing will fall away.
The third stage will ignite for a 12-minute burn before releasing the GSAT 14 spacecraft in an orbit with a low point of about 180 kilometers, or 111 miles, a high point of 35,975 kilometers, or 22,353 miles, and an inclination of 19.3 degrees. See more details on the GSLV's flight sequence in our launch timeline (http://www.spaceflightnow.com/gslv/d5/launchtimeline.html).
          
1029 GMT (5:29 a.m. EST)
 The mission director has authorized the launch of the GSLV.
          
1028 GMT (5:28 a.m. EST)
 T-minus 20 minutes. Today is the second launch attempt for the GSLV-D5 mission following an Aug. 19 countdown which was aborted 75 minutes before liftoff due to a fuel leak in the rocket's second stage.
The leak of toxic hydrazine fuel was blamed on cracks in the second stage fuel tank, which was made of an aluminum-zinc alloy known as Afnor 7020. The Indian launch team rolled the GSLV back to the vehicle assembly building at the Satish Dhawan Space Center to be taken apart and refurbished.
Engineers replaced the first and second stages of the GSLV after the Aug. 19 launch attempt. The new second stage has a fuel tank made of a different aluminum-copper alloy named AA2219.
ISRO also changed out electronic components inside the GSLV's four liquid-fueled strap-on boosters damaged by the fuel leak and subsequent cleaning with water. The third stage and GSAT 14 spacecraft were inspected and tested during the fall and found to be ready for launch.
          
1022 GMT (5:22 a.m. EST)
 We are now streaming live video from India's Satish Dhawan Space Center, wh ere all launch preparations are on track for liftoff in 26 minutes.

Цитировать1046 GMT (5:46 a.m. EST)
T-minus 2 minutes. The GSLV's four L40H strap-on boosters will fire their Vikas engines at T-minus 4.8 seconds, giving the engines time to ramp up to full power of 150,000 pounds of thrust.

Ignition of the launcher's S139 solid-fueled core stage occurs as the countdown clock hits zero, followed immediately by liftoff.

The countdown is under the control of a computerized automatic sequence.
1045 GMT (5:45 a.m. EST)
T-minus 3 minutes. A check of the weather conditions show all parameters are acceptable for launch.
1043 GMT (5:43 a.m. EST)
T-minus 5 minutes.

Цитировать1051 GMT (5:51 a.m. EST)
T+plus 3 minutes, 50 seconds. The GSLV's metallic nose shroud has jettisoned, exposing the GSAT 14 satellite to space for the first time.

The rocket's second stage engine will shut down at T+plus 4 minutes, 49 seconds. Just a few seconds later, the third stage will separate and ignite to continue propelling GSAT 14 toward orbit.

1050 GMT (5:50 a.m. EST)
 T+plus 2 minutes. The GSLV's core motor has burned out, and the rocket's four strap-on boosters will shut down in less than 30 seconds, followed by ignition of the second stage.
          
1049 GMT (5:49 a.m. EST)
 T+plus 60 seconds. The GSLV has surpassed the speed of sound, and the flight is proceeding normally.
          
1048 GMT (5:48 a.m. EST)
 LIFTOFF of the Geosynchronous Satellite Launch Vehicle on a test flight of India's indigenous cryogenic upper stage.

Цитировать1054 GMT (5:54 a.m. EST)
 T+plus 6 minutes. Officials report the third stage engine is performing within limits.
The third stage engine is designed to produce 75 kilonewtons, or 16,860 pounds, of thrust and burns more than 28,000 pounds of liquid hydrogen and liquid oxygen during its 12-minute burn.
          
1053 GMT (5:53 a.m. EST)
 T+plus 5 minutes. Launch officials say the second stage has shut down and separated, and the third stage cryogenic engine is now firing. The Indian-built engine is the centerpiece of today's test launch.

Цитировать1059 GMT (5:59 a.m. EST)
T+plus 11 minutes. The Indian cryogenic third stage is about halfway through its 12-minute burn. Altitude is 132 kilometers, downrange distance is 2,624 kilometers and velocity is 6.56 kilometers per second.

1056 GMT (5:56 a.m. EST)
T+plus 8 minutes. No problems reported so far during this launch.

Цитировать1102 GMT (6:02 a.m. EST)
T+plus 14 minutes. Shutdown of the upper stage is expected at T+plus 16 minutes, 55 seconds. The rocket is aiming for an orbit with a low point of about 180 kilometers, or 111 miles, a high point of 35,975 kilometers, or 22,353 miles, and an inclination of 19.3 degrees.

1100 GMT (6:00 a.m. EST)
T+plus 12 minutes, 30 seconds. ISRO says the third stage's thrust level has been throttled down a bit as designed.

Цитировать1106 GMT (6:06 a.m. EST)
The official commentators from the control center say the rocket achieved a "very precise" orbit.

1105 GMT (6:05 a.m. EST)
Spacecraft separation! The GSAT 14 satellite has been released from the rocket's third stage. All indications are this launch was a success.

1105 GMT (6:05 a.m. EST)
T+plus 17 minutes. Third stage shutdown has been confirmed on time. Data being broadcast by ISRO show the rocket achieved an orbit close to the target.

Separation of the GSAT 14 spacecraft is expected momentarily.

ЦитироватьНЬЮ-ДЕЛИ, 5 января. /Корр. ИТАР-ТАСС Александр Антипин/. Индия впервые успешно запустила ракету- носитель с криогенным двигателем собственного производства GSLV-D5. Она стартовала с космодрома на острове Шрихарикота в Бенгальском заливе вблизи побережья штата Андхра-Прадеш на юге Индии.

19 августа запуск этой ракеты-носителя не состоялся из- за утечки топлив. Теперь она вывела на орбиту телекоммуникационный спутник GSAT-14.

Ранее Индия шесть раз успешно запускала аналогичные ракеты (GSLV) с криогенными двигателями российского производства. В 2010 году Индия попыталась впервые запустить ракету-носитель с двигателем собственного производства. Тогда попытка не увенчалась успехом.

Пуск такой ракеты обходится индийской экономике в 1,6 млрд рупий ($25 млн). Еще в 400 млн рупий ($6,3 млн) оценивается стоимость телекоммуникационного спутника, который она должна была вывести на орбиту.
Вес GSAT-14 превышает 1,9 тонны. Ракета-носитель с криогенным двигателем может выводить на орбиту спутники повышенной тяжести (весом свыше полутора тонн). До этого Индии приходилось запускать такие спутники на иностранных ракетах.

Цитироватьche wi пишет:
Пуск такой ракеты обходится индийской экономике в 1,6 млрд рупий ($25 млн). Еще в 400 млн рупий ($6,3 млн) оценивается стоимость телекоммуникационного спутника, который она должна была вывести на орбиту.

ЦитироватьZOOR пишет:

Цитироватьche wi пишет:
Пуск такой ракеты обходится индийской экономике в 1,6 млрд рупий ($25 млн). Еще в 400 млн рупий ($6,3 млн) оценивается стоимость телекоммуникационного спутника, который она должна была вывести на орбиту.

Цифры в баксах потрясающие

ЦитироватьПрол пишет:

ЦитироватьZOOR пишет:

Цитироватьche wi пишет:
Пуск такой ракеты обходится индийской экономике в 1,6 млрд рупий ($25 млн). Еще в 400 млн рупий ($6,3 млн) оценивается стоимость телекоммуникационного спутника, который она должна была вывести на орбиту.

Цифры в баксах потрясающие

Да, хотя и неправильные .
Radhakrishnan said the country pays around $85-90 million or around Rs.500 crore as launch fee for sending up a 3.5 tonne communication satellites whereas the GSLV rocket costs around Rs.220 crore and the GSAT-14 that would go up Sunday evening costs around Rs.145 crore.
Т.е. около $40 млн. за РН и около $26 млн. за спутник. Это тоже сильно. Еще один конкурент по извозу .
(Цитата из поста ronatu #9  8)  .

http://www.business-standard.com/article/news-ians/gslv-rocket-s-success-will-mean-immense-savings-isro-chief-114010400550_1.html

ЦитироватьVeganin пишет:
 ЦиХ чужими руками убил американского выскочку.
            
         
      
      
         
            

ЦитироватьПрол пишет:

ЦитироватьVeganin пишет:
 ЦиХ чужими руками убил американского выскочку.
            
         
      
      
         
            

Ну, может и не убил окончательно, но жизнь, похоже, усложнили основательно.

ЦитироватьПрол пишет:
ИМХО, красивая ракета у индусов получилась!

Цитироватьilan пишет:
Не смог найти, обсуждались ли здесь компоновка и время работы ускорителей и первой ступени.
Получается так, что твердотопливная первая ступень работает на 40 (или 60 по другим источникам) секунд меньше жидкостных гептильных ускорителей и ускорители это время тащат пустой корпус первой ступени?

Цитировать1050 GMT (5:50 a.m. EST)
 T+plus 2 minutes, 40 seconds. Separation of the first stage and boosters has been confirmed by ISRO launch controllers, and the second stage's Vikas engine is now firing for a burn scheduled to last 2 minutes, 20 seconds.
          
1050 GMT (5:50 a.m. EST)
 T+plus 2 minutes. The GSLV's core motor has burned out, and the rocket's four strap-on boosters will shut down in less than 30 seconds, followed by ignition of the second stage.

ЦитироватьДенеб пишет:
 Так, на всякий случай: что значит "получилась"? http://space.skyrocket.de/doc_lau/gslv.htm

Цитировать4.40 pm: GSLV-D5 with indigenous cryogenic engine successfully places GSAT-14 communication satellite on orbit.

4.25 pm: Cryogenic stage burn out. Performance normal. 

4.25 pm: Performance of the cryogenic engine normal. Range 150 km.

4.22 pm: Payload faring successfully separates.Second stage also separated.

4.21 pm: Second stage of GSLV D5 ignited. Vehicle at an altitude of 99 km. 

4.20 pm: First stage of the GSLV-D5 performance normal.

4.18 pm:  GSLV-D5 successfully lifts off.

ЦитироватьGradient пишет:
И почался геноцид и свежевание неубитых медведей...
С двумя тоннами на GTO не рано ли Арианспейс хоронить?

Цитировать ilan пишет:
Не смог найти, обсуждались ли здесь компоновка и время работы ускорителей и первой ступени.
Получается так, что твердотопливная первая ступень работает на 40 (или 60 по другим источникам) секунд меньше жидкостных гептильных ускорителей и ускорители это время тащат пустой корпус первой ступени?

Цитироватьfagot пишет:

ЦитироватьНо ведь это же нерационально! Тащить выгоревший ТТРД

За основу была принята PSLV, отсюда и схема. Разработать полностью новый "рациональный" носитель было бы сложнее и дороже.

ЦитироватьДенеб пишет:

ЦитироватьПрол пишет:
ИМХО, красивая ракета у индусов получилась!

Так, на всякий случай: что значит "получилась"? http://space.skyrocket.de/doc_lau/gslv.htm

Цитироватьilan пишет:
Мои поздравления индийским товарищам с успехом!

Не смог найти, обсуждались ли здесь компоновка и время работы ускорителей и первой ступени.
Получается так, что твердотопливная первая ступень работает на 40 (или 60 по другим источникам) секунд меньше жидкостных гептильных ускорителей и ускорители это время тащат пустой корпус первой ступени?

ЦитироватьZOOR пишет:

ЦитироватьДенеб пишет:
 Так, на всякий случай: что значит "получилась"? http://space.skyrocket.de/doc_lau/gslv.htm

Получилась, с длительным тернистым процессом отработки

ЦитироватьСтарый пишет:
Вобщето в действительности по центру ускоритель а четырёхблочная первая ступень вокруг.

ЦитироватьSFN пишет:

ЦитироватьСтарый пишет:
Вобщето в действительности по центру ускоритель а четырёхблочная первая ступень вокруг.

А тогда можно назвать это бустером? ступенью допустим можно, но бустером? Как это вспомогательное устройство может быть внутри основного?

ЦитироватьG.K. пишет:
что я же где-то видел такую компоновку.

ЦитироватьSFN пишет:
они не сбрасываются до отделения первой ступени

ЦитироватьSFN пишет:
А тогда можно назвать это бустером? ступенью допустим можно, но бустером? Как это вспомогательное устройство может быть внутри основного?

ЦитироватьSFN пишет:
Не пытатесь юлить. Стартовые ускорители - strap-on rocket used to augment the core launch vehicle's takeoff thrust and payload capability

А если они не сбрасываются до отделения первой ступени то это "блок первой ступени"

ЦитироватьGeorge пишет:
Жидкостные блоки от центра не отделяются и падают в море совместно. Это единая первая ступень.

ЦитироватьНеглупый пишет:
А в данном случае, пмсм, нужно рассматривать как одну ступень с дросселированием

ЦитироватьСтарый пишет:

ЦитироватьGeorge пишет:
Жидкостные блоки от центра не отделяются и падают в море совместно. Это единая первая ступень.

Если ускорители (ускоритель) не отделяются от блока то они не перестают от этого быть ускорителями. Ускоритель это функциональность а не конструктивное решение.

ЦитироватьSFN пишет:

ЦитироватьНеглупый пишет:
А в данном случае, пмсм, нужно рассматривать как одну ступень с дросселированием

В лаунмодели не получится с досселированием. Лучше как две.

ЦитироватьСтарый пишет:
Если ускорители (ускоритель) не отделяются от блока то они не перестают от этого быть ускорителями. Ускоритель это функциональность а не конструктивное решение.

ЦитироватьСтарый пишет:

ЦитироватьSFN пишет:
Не пытатесь юлить. Стартовые ускорители - strap-on rocket used to augment the core launch vehicle's takeoff thrust and payload capability

А если они не сбрасываются до отделения первой ступени то это "блок первой ступени"

Стартовые ускорители вовсе не обязаны сбрасываться после отрабатывания. Их функциональность вовсе не в этом. Их функциональность - увеличивать тягу при старте и ускорять полёт ракеты. После отрабатывания они могут висеть дальше сколько потребуется не переставая от этого быть ускорителями.

ЦитироватьGeorge пишет:
Я заметил, что у индусов нет рокеткамов и вообще, уровень трансляции беден.

ЦитироватьСтарый пишет:

Цитироватьilan пишет:
Мои поздравления индийским товарищам с успехом!

Не смог найти, обсуждались ли здесь компоновка и время работы ускорителей и первой ступени.
Получается так, что твердотопливная первая ступень работает на 40 (или 60 по другим источникам) секунд меньше жидкостных гептильных ускорителей и ускорители это время тащат пустой корпус первой ступени?

Вобщето в действительности по центру ускоритель а четырёхблочная первая ступень вокруг.

ЦитироватьДмитрий В. пишет:
Вообще и твердотопливный блок и четыре жидкостных образуют двухтопливный ракетный ускоритель первой ступени

ЦитироватьСтарый пишет:

ЦитироватьДмитрий В. пишет:
Вообще и твердотопливный блок и четыре жидкостных образуют двухтопливный ракетный ускоритель первой ступени

Ну хорошо хоть не четыре навесных жидкостных ускорителя.
 Однако увы, по выполняемым функциям центральный блок это твердотопливный ускоритель, а четыре навесных блока это первая ступень.

ЦитироватьДмитрий В. пишет:
Особенности отечественной терминологии. Например, блоки Б, В, Г и Д образуют ускоритель первой ступени Р-7, а блок А - ускоритель второй ступени Р-7.

ЦитироватьСтарый пишет:

ЦитироватьДмитрий В. пишет:
Особенности отечественной терминологии. Например, блоки Б, В, Г и Д образуют ускоритель первой ступени Р-7, а блок А - ускоритель второй ступени Р-7.

Я ж только что на той странице сказал что счас начнут путать "навесной стартовый ускоритель" и "ускооритель такой то ступени".
Это кто и когда ввёл терминологию "ускоритель ступени"? Низкопоклонство перед западом?

ЦитироватьДмитрий В. пишет:

ЦитироватьСтарый пишет:

ЦитироватьДмитрий В. пишет:
Особенности отечественной терминологии. Например, блоки Б, В, Г и Д образуют ускоритель первой ступени Р-7, а блок А - ускоритель второй ступени Р-7.

Я ж только что на той странице сказал что счас начнут путать "навесной стартовый ускоритель" и "ускооритель такой то ступени".
Это кто и когда ввёл терминологию "ускоритель ступени"? Низкопоклонство перед западом?

Где-то после войны.

ЦитироватьСтарый пишет:

ЦитироватьДмитрий В. пишет:

ЦитироватьСтарый пишет:

ЦитироватьДмитрий В. пишет:
Особенности отечественной терминологии. Например, блоки Б, В, Г и Д образуют ускоритель первой ступени Р-7, а блок А - ускоритель второй ступени Р-7.

Я ж только что на той странице сказал что счас начнут путать "навесной стартовый ускоритель" и "ускооритель такой то ступени".
Это кто и когда ввёл терминологию "ускоритель ступени"? Низкопоклонство перед западом?

Где-то после войны.

А в какой книжке такое слово впервые встречается? В Красной энциклопедии есть?

ЦитироватьДмитрий В. пишет:
Быстрее всего в переводной работе Фертрегта по многоступенчатым РН (издана у нас кажись в 1947 году), хотя точно и не вспомню. Термин применялся у нас в методичке по расчету характеристик ракет. Сейчас не помню, использовался ли термин "ускоритель ступени" в ОСТе.

ЦитироватьДмитрий В. пишет:
Вообще и твердотопливный блок и четыре жидкостных образуют двухтопливный ракетный ускоритель первой ступени

ЦитироватьВВК пишет:
то это явно не 1-ая ступень

ЦитироватьСтарый пишет:
У нас пррименяется термин "ступень", а если надо отделить ракетную часть ступени от полезной нагрузки то говорят "ракетный блок (блоки) такой то ступени". Но никак не "ускоритель".

ЦитироватьСтарый пишет:

ЦитироватьДмитрий В. пишет:
Быстрее всего в переводной работе Фертрегта по многоступенчатым РН (издана у нас кажись в 1947 году), хотя точно и не вспомню. Термин применялся у нас в методичке по расчету характеристик ракет. Сейчас не помню, использовался ли термин "ускоритель ступени" в ОСТе.

Вот и я ж про низкопоклонство перед Западом. Пишут там "бустер" значит и нам надо. Особенно если это какойто провинциальный политех.
 Насколько я понял от френира, единственный раз такое определение употреблялось в учебнике Мишина. У нас пррименяется термин "ступень", а если надо отделить ракетную часть ступени от полезной нагрузки то говорят "ракетный блок (блоки) такой то ступени". Но никак не "ускоритель".

ЦитироватьSFN пишет:

ЦитироватьДмитрий В. пишет:
Вообще и твердотопливный блок и четыре жидкостных образуют двухтопливный ракетный ускоритель первой ступени

Когдато это чудо природы уважаемый ДмитрийВ определял как "ступень со смешанной ДУ".

ЦитироватьДмитрий В. пишет:
А принципиальной разницы нет. Здесь основной признак - не тип топлива и не время отсечки/отключения, а время отделения. Если жидкостные и твердотопливные блоки отделяются одновременно, то это - единый ракетный блок (ускоритель) ракетной ступени.

ЦитироватьG.K. пишет:

ЦитироватьВВК пишет:
то это явно не 1-ая ступень

А твердотопливные бустеры/ускорители.

ЦитироватьДмитрий В. пишет:

ЦитироватьSFN пишет:

ЦитироватьДмитрий В. пишет:
Вообще и твердотопливный блок и четыре жидкостных образуют двухтопливный ракетный ускоритель первой ступени

Когдато это чудо природы уважаемый ДмитрийВ определял как "ступень со смешанной ДУ".

А принципиальной разницы нет. Здесь основной признак - не тип топлива и не время отсечки/отключения, а время отделения. Если жидкостные и твердотопливные блоки отделяются одновременно, то это - единый ракетный блок (ускоритель) ракетной ступени.

ЦитироватьВВК пишет:
Я хотел сказать одно , что конструкция может быть любой, но бустеры/ускорители появляются если сразу, и это постоянное явление, то это все вместе ступень, а если первоначальная конструкция потом получает дополнение и это дополнение может использоваться по мере необходимости, но не постоянно , то это отдельные бустеры/ускорители, но не как не ступень

ЦитироватьСтарый пишет:
Балистически это единая ступень. А функционально - ступень и ускоритель.

ЦитироватьSFN пишет:

ЦитироватьСтарый пишет:
Балистически это единая ступень. А функционально - ступень и ускоритель. 

Ага, РДТТ ступень и жидкий ускоритель намертво к ней прикрученный 
Функционально они прикручены друг к другу насмерть. Типа ступень с автоматическим дросселированием. Единое целое.

Цитировать Старый пишет:
Функционально твердотопливный стартовый ускоритель это ракетный блок предназначеный для увеличения тяги РН при старте.

ЦитироватьSFN пишет:

ЦитироватьСтарый пишет:
Функционально твердотопливный стартовый ускоритель это ракетный блок предназначеный для увеличения тяги РН при старте.

Очевидна подмена теплого на мягкое. Что означает "предназначены для увеличения тяги"? Была тяга маленька добавили ускоритель стала большой? Теперь нарисуйте то, что было до добавления ускорителя.

ЦитироватьСтарый пишет:
Тяги одних только четырёх блоков 1 ступени для ГСЛВ достаточно?

ЦитироватьНеглупый пишет:
А если продолжать в этом духе.
Тяги одного (из четырех) блоков с ЖРД недостаточно, значит один ступень а три - ускорители?

ЦитироватьСтарый пишет:

ЦитироватьSFN пишет:

ЦитироватьСтарый пишет:
Функционально твердотопливный стартовый ускоритель это ракетный блок предназначеный для увеличения тяги РН при старте.

Очевидна подмена теплого на мягкое. Что означает "предназначены для увеличения тяги"? Была тяга маленька добавили ускоритель стала большой? Теперь нарисуйте то, что было до добавления ускорителя.

Была тяга недостаточной, сделали больше. Тяги одних только четырёх блоков 1 ступени для ГСЛВ достаточно?

ЦитироватьSFN пишет:
Нет сначсала нарисуйте ракету до установки этого "ускорителя."

Цитироватьus2-star пишет:
Если с ракеты снять 4 блока первой ступени, сможет ли оставшийся стартовый ускоритель оторвать то что осталось от земли?

ЦитироватьSFN пишет:

ЦитироватьВВК пишет:
Я хотел сказать одно , что конструкция может быть любой, но бустеры/ускорители появляются если сразу, и это постоянное явление, то это все вместе ступень, а если первоначальная конструкция потом получает дополнение и это дополнение может использоваться по мере необходимости, но не постоянно , то это отдельные бустеры/ускорители, но не как не ступень

В этой ракете обе ДУ первой ступени используются постоянно. Отделяются одновременно. И привернуты друг к другу намертво.

ЦитироватьСтарый пишет:

Цитироватьus2-star пишет:
Если с ракеты снять 4 блока первой ступени, сможет ли оставшийся стартовый ускоритель оторвать то что осталось от земли?

Сможет. Только это будет PSLV.

ЦитироватьВВК пишет: И может все-таки отдадим право дать название ГК ведь это его идея, чего он там планировал только ему известно.

ЦитироватьСтарый пишет:
Можно конечно отдать право. Пусть хоть горшком обзовёт, главное чтоб в печь не поставил.
Мы ж обсуждаем не как обозвать а чем оно является на самом деле.

ЦитироватьВВК пишет:

ЦитироватьСтарый пишет:
Можно конечно отдать право. Пусть хоть горшком обзовёт, главное чтоб в печь не поставил.
Мы ж обсуждаем не как обозвать а чем оно является на самом деле.

Извиняюсь за назойливость, я опять попытаюсь просто объяснить свое мнение, вот скажите есть какое-нибудь правило, которое категорически требует делить конструкцию любой РКН на ступени, ускорители и так и только так. Вот если кто-нибудь в каком-нибудь , скажем , учебном издании станет называть вместо ступень , ну скажем например, блок 1(2 или 3 стандартного для данного типа РКН , или дополнительного) этапа работы РКН, а блок может иметь вид 1.одна стандартная ступень(но такого диаметра, такой-то длины, такой-то тяги) , 2. блок из нескольких стандартных ступеней, 3. ступень из нескольких отдельных боковых элементов , 4.блок из нескольких ускорителей жестко закрепленных на стандартной ступени, 5. стандартная ступень от другой РКН, но с одним или несколькими дополнительными наружными двигателями. Это будет неправильно и будет противоречить каким-нибудь правилам , точнее законам , или нет? А если в этой схеме вместо термина ускоритель(или бустер) применит термин увеличитель тяги или дополнительный выносной автономный двигатель или для этого надо опять соблюдать определенные правила? Может все же делить по принципу действия это есть скажем стандартная, есть дополнительная комплектация. В стандартной есть условно ступень №... или блок-ступень №... и есть дополнительные устройства и у всех у них могут быть разнообразные конструкции, вот в данном случае 1-ый этап по типу 4. Может так получится придти к общему мнению ? Просто схем может быть множество, а я так понимаю классификация наверно есть , но мы на нее не опираемся, либо опять их много.

ЦитироватьВВК пишет:

ЦитироватьСтарый пишет:
Можно конечно отдать право. Пусть хоть горшком обзовёт, главное чтоб в печь не поставил.
Мы ж обсуждаем не как обозвать а чем оно является на самом деле.

Извиняюсь за назойливость, я опять попытаюсь просто объяснить свое мнение, вот скажите есть какое-нибудь правило, которое категорически требует делить конструкцию любой РКН на ступени, ускорители и так и только так.

ЦитироватьСтарый пишет:
Ещё раз подчёркиваю: речь не о том как называть свои ступени разработчикам, а о том как их называть нам.

ЦитироватьNilk пишет:
Если на то пошло, то на "за бугром" применяется термин strap-on, который у нас почему-то часто переводится как ускоритель, на самом деле - это то что пристегивается к ракете с боку (ну отсюда и название), 

ЦитироватьА вот переводить ли слово strap-on на русский язык словом ускоритель тут уж сами решайте.

ЦитироватьNilk пишет:
 Старый , т.е. получается есть два термина booster и strap-on, ИМХО любой booster - это strap-on, но не любой strap-on - это booster, 

ЦитироватьСтарый пишет:
Это неплохо бы знать нашим низкопоклонщикам которые начали обзывать ступени "ускорителями".

ЦитироватьСтарый пишет:
Это неплохо бы знать нашим низкопоклонщикам которые начали обзывать ступени "ускорителями".

ЦитироватьSFN пишет:

ЦитироватьСтарый пишет:
Это неплохо бы знать нашим низкопоклонщикам которые начали обзывать ступени "ускорителями".

Пока четко видна попытка называть ускорителями все нижние РДТТ. При таком подходе "ускорителямь" только калька с "booster"

ЦитироватьСтарый пишет:
Ээээ... Чья попытка?

ЦитироватьВВК пишет:

ЦитироватьСтарый пишет:
Ещё раз подчёркиваю: речь не о том как называть свои ступени разработчикам, а о том как их называть нам.

Во-первых спасибо за ответы и терпение, а относительно как их называть, то мое мнение личное, если оно интересно,то внешне(зрительно) это ускорители,и 1-ая ступень отдельно, а фактически блок 1-ой ступени(просто 1-ая ступень) из готовых ускорителей(которые были в наличии разработанные) и стандартной ступени от ПСЛВ, Ещё раз спасибо за терпение.

ЦитироватьСтарый пишет:

ЦитироватьSFN пишет:

ЦитироватьСтарый пишет:
Это неплохо бы знать нашим низкопоклонщикам которые начали обзывать ступени "ускорителями".

Пока четко видна попытка называть ускорителями все нижние РДТТ. При таком подходе "ускорителямь" только калька с "booster"

Ээээ... Чья попытка?

ЦитироватьВВК пишет:
услышать комент на свое представление об изделии

ЦитироватьNilk пишет:
Ускоритель - это то что "ускоряет" уже существующую ракету, есть допустим Атлас-5, отлично летает и без ускорителей, приделали ускорители - вывели больший груз, а если рекета без первой ступени никуда не полетит, то это и есть первая ступень, а не ускоритель ИМХО.

ЦитироватьСтарый пишет:
То есть мы в данном случае имеем дело всего лишь с инерционностью мышления.

ЦитироватьSFN пишет:

ЦитироватьСтарый пишет:
То есть мы в данном случае имеем дело всего лишь с инерционностью мышления.

Ваше мысление невесомо и потому безинерционно.

ЦитироватьSFN пишет:
Они называют связку 1st stage

ЦитироватьSFN пишет:
Лучше давате про Core booster продолжать.

ЦитироватьСтарый пишет:

ЦитироватьSFN пишет:
Они называют связку 1st stage

Правильно. Они пользуются научным балистическим определением.

ЦитироватьSFN пишет:

ЦитироватьСтарый пишет:

ЦитироватьSFN пишет:
Они называют связку 1st stage

Правильно. Они пользуются научным балистическим определением.

Вау! куда делся "Вобщето в действительности по центру ускоритель а четырёхблочная первая ступень вокруг. "??

Цитироватьilan пишет:
Не смог найти, обсуждались ли здесь компоновка и время работы ускорителей и первой ступени.
Получается так, что твердотопливная первая ступень работает на 40 (или 60 по другим источникам) секунд меньше жидкостных гептильных ускорителей и ускорители это время тащат пустой корпус первой ступени?

ЦитироватьНеглупый пишет:
Старый против всех - шансы равны

ЦитироватьSFN пишет:
А тогда можно назвать это бустером? ступенью допустим можно, но бустером? Как это вспомогательное устройство может быть внутри основного?

ЦитироватьСтарый пишет:

ЦитироватьSFN пишет:

ЦитироватьСтарый пишет:

ЦитироватьSFN пишет:
Они называют связку 1st stage

Правильно. Они пользуются научным балистическим определением.

Вау! куда делся "Вобщето в действительности по центру ускоритель а четырёхблочная первая ступень вокруг. "??

На месте. А что случилось?

ЦитироватьСтарый пишет:
Ещё раз, СФН, не только вы но и многие другие считали навесные жидкостные блоки стартовыми ускорителями. Теперь когда вам объяснили вы вместо "спасибо" начинаете тупить и паясничать. Собственно я и не ставил задачи вас убедить, мне интересно как вы будете выкручиваться.

ЦитироватьSFN пишет:
Не пытайтесь мне приписать, то что я не писал. Это нехорошо выглядит. Я с самого начала сообщил что определение ДмитрияВ как "ступени со смешанной ДУ" на мой взгляд самое правильное.

ЦитироватьСтарый пишет:
Твердотопливный центральный блок ПО ВЫПОЛНЯЕМЫМ ИМ ФУНКЦИЯМ является стартовым ускорителем.
Что не так? Как было так и осталось. Ну возразите что-нибудь, скажиьте что он выполняет какие то другие функции.

ЦитироватьSFN пишет:
Ничего не случилось. На картинке ступень есть, а ускорителя нет

ЦитироватьGSLV is a three stage vehicle GSLV is 49 m tall, with 414 t lift off weight. It has a maximum diameter of 3.4 m at the payload fairing. First stage comprises S125 solid booster with four liquid (L40) strap-ons. Second stage (GS2) is liquid engine and the third stage (GS3) is a cryo stage. 

ЦитироватьСтарый пишет: И напоминаю уровень ваших возражений:
SFN пишет:
А тогда можно назвать это бустером? ступенью допустим можно, но бустером? Как это вспомогательное устройство может быть внутри основного?

ЦитироватьSFN пишет:

ЦитироватьСтарый пишет:
Вобщето в действительности по центру ускоритель а четырёхблочная первая ступень вокруг.

А тогда можно назвать это бустером? ступенью допустим можно, но бустером? Как это вспомогательное устройство может быть внутри основного?

ЦитироватьSFN пишет:
 Мне кстати до сих пор непонятно, как первая ступень ПСЛВ в ГСЛВ умудрилась стать ускорителем.

Цитироватьus2-star пишет:
 http://www.antrix.gov.in/gslv.html (http://www.antrix.gov.in/gslv.html)

ЦитироватьGSLV is a three stage vehicle GSLV is 49 m tall, with 414 t lift off weight. It has a maximum diameter of 3.4 m at the payload fairing. First stage comprises S125 solid booster with four liquid (L40) strap-ons. Second stage (GS2) is liquid engine and the third stage (GS3) is a cryo stage.  

ЦитироватьSFN пишет:
Отлично уже есть ускоритель. S125 solid booster означает что ракетный блок S125 выполнен как ракетный ускоритель.
Про ПСЛВ "The first stage is one of the largest solid propellant boosters in the world and carries 139 tonnes of propellant." Так это по вот это я писал вот это "Я вижу попытку считать все РДТТ работающие от земли ускорителями, не более того."

ЦитироватьНК писал:
С точки зрения ДУ в GSLV два новых элемента: жидкостные стартовые ускорители ЖСУ с "земными" двигателями Vikas и криогенная верхняя ступень СS

ЦитироватьЗа 4.8 сек до Т=0 запустились двигатели четырёх навесных жидкостных стартовых ускорителей (ЖСУ)...
В Т=0 после подтверждения нормальной работы ЖСУ включился мощный РДТТ первой ступени... 

ЦитироватьПервая ступень включает твердотопливный двигатель S139  и четыре навесных неотделяемых жидкостных ускорителя L40H

ЦитироватьПрол пишет:
Занятный у вас спор, однако . У кого из вас английский - родной язык? Booster- одно из самых многозначимых слов в английском. Это м.б. и РН вся, и стартовый ускоритель и просто ускоритель, и усилитель, и детское автомобильное сиденье (подпопник), и рабочий внизу штабеля (подавальщик по-нашему) и т.д. и т. п.

ЦитироватьПрол пишет:
А у нас нет сложившейся терминологии - на "Союзах" все боковушки - это ступень, на Атласах или Дельтах - это ускорители. Индусы вам предлагают свой вариант - все это первая ступень. Чего бы с ними не согласиться?
Если говорить о терминологии, ИМХО, логично идти по амерскому варианту: первая ступень - конструктивная единица, движки на которой включаются при старте и которая отделяется как единое целое. Если не хватает тяги - появляются ускорители (как правило, боковые ).

ЦитироватьСтарый пишет:

ЦитироватьПрол пишет:
А у нас нет сложившейся терминологии - на "Союзах" все боковушки - это ступень, на Атласах или Дельтах - это ускорители. Индусы вам предлагают свой вариант - все это первая ступень. Чего бы с ними не согласиться?
Если говорить о терминологии, ИМХО, логично идти по амерскому варианту: первая ступень - конструктивная единица, движки на которой включаются при старте и которая отделяется как единое целое. Если не хватает тяги - появляются ускорители (как правило, боковые ).

Твердотопливный центральный блок на GSLV функционально выполняет роль твердотопливного стартового ускорителя. Да/Нет?

ЦитироватьСтарый пишет:
Можно ответить так: "Твердотопливный центральный блок на GSLV выполняет какую угодно роль только не твердотопливного стартового ускорителя."

ЦитироватьSFN пишет:
Пока четко видна попытка называть ускорителями все нижние РДТТ. 

ЦитироватьСтарый пишет:

ЦитироватьПрол пишет:
Занятный у вас спор, однако . У кого из вас английский - родной язык? Booster- одно из самых многозначимых слов в английском. Это м.б. и РН вся, и стартовый ускоритель и просто ускоритель, и усилитель, и детское автомобильное сиденье (подпопник), и рабочий внизу штабеля (подавальщик по-нашему) и т.д. и т. п.

Вам сюда: http://novosti-kosmonavtiki.ru/forum/messages/forum12/topic12876/message1185575/#message1185575

ЦитироватьПрол пишет:

ЦитироватьСтарый пишет:
Твердотопливный центральный блок на GSLV функционально выполняет роль твердотопливного стартового ускорителя. Да/Нет?

Нет.

ЦитироватьСтарый пишет:
Тогда как на самом деле первая ступень состоит из четырёх жидкостных боковых блоков и твердотопливного центрального блока выполняющего роль твердотопливного стартового ускорителя.

ЦитироватьЦитатаСтарый пишет:
Вобщето в действительности по центру ускоритель а четырёхблочная первая ступень вокруг.

ЦитироватьSFN пишет:

ЦитироватьСтарый пишет:
Тогда как на самом деле первая ступень состоит из четырёх жидкостных боковых блоков и твердотопливного центрального блока выполняющего роль твердотопливного стартового ускорителя.

Как то потихоньку незаметно центральный ускоритель стал частью ступени 

ЦитироватьSFN пишет:
В этой ракете центральный блок стартовым ускорителем быть не может

ЦитироватьСтарый пишет:

ЦитироватьSFN пишет:
В этой ракете центральный блок стартовым ускорителем быть не может

А выполнять роль ускорителя может.

ЦитироватьСтарый пишет:

ЦитироватьSFN пишет:

ЦитироватьСтарый пишет:
Тогда как на самом деле первая ступень состоит из четырёх жидкостных боковых блоков и твердотопливного центрального блока выполняющего роль твердотопливного стартового ускорителя.

Как то потихоньку незаметно центральный ускоритель стал частью ступени

А что, не был? Отдельно болтался?

ЦитироватьСтарый пишет:
Вобщето в действительности по центру ускоритель а четырёхблочная первая ступень вокруг.

ЦитироватьСтарый пишет:
 СФН, может вы забыли с чего всё началось?

Цитироватьilan пишет:
Не смог найти, обсуждались ли здесь компоновка и время работы ускорителей и первой ступени.
Получается так, что твердотопливная первая ступень работает на 40 (или 60 по другим источникам) секунд меньше жидкостных гептильных ускорителей и ускорители это время тащат пустой корпус первой ступени?

http://novosti-kosmonavtiki.ru/forum/messages/forum12/topic12876/message1184438/#message1184438
               
                  

ЦитироватьSFN пишет:

Цитироватьilan пишет:
Не смог найти, обсуждались ли здесь компоновка и время работы ускорителей и первой ступени.
Получается так, что твердотопливная первая ступень работает на 40 (или 60 по другим источникам) секунд меньше жидкостных гептильных ускорителей и ускорители это время тащат пустой корпус первой ступени?

Цитироватьfagot пишет:

ЦитироватьНо ведь это же нерационально! Тащить выгоревший ТТРД

За основу была принята PSLV, отсюда и схема. Разработать полностью новый "рациональный" носитель было бы сложнее и дороже.

ЦитироватьВВК пишет:
Т.е. если индусы потом придумают ступень когда эта центральная часть будет работать столько сколько боковушки или чуть больше, то все станет на свои места и спор будет не нужен.

ЦитироватьПо-моему весь спор возник оттого , что термин ускоритель не поймешь что означает и к теме спора больше подойдет название увеличитель тяги, больше видно будет , что это дополнительное устройство.

ЦитироватьSFN пишет:

ЦитироватьНеглупый пишет:
Старый против всех - шансы равны

Ну если как на базаре - кто последний тот и прав, то шансы не равны. А других вариантов нет.
Я, например, даже и не ставлю себе задачку убедить Старого в чем либо.

ЦитироватьSFN пишет:
 final circular orbit with an inclination of 74 degrees east

ЦитироватьFALCON 9 R/B
NORAD ID: 39499   
Int'l Code: 2014-001B 
Perigee: 187.3 km 
Apogee: 35,623.0 km 
Inclination: 19.4 ° 
Period: 627.4 minutes 
Semi major axis: 24276 km 
Launch date: January 5, 2014 
Source: India (IND) 
Note: This is a ROCKET BODY

Цитироватьilan пишет:
Что-то праздники не только у нас на головы влияют.
Сегодня на http://www.n2yo.com/satellite/?s=39499
GSLV Фалконом обозвали:

ЦитироватьVeganin пишет:
Это влияние мысли, что у Маска появился серьезный конкурент

ЦитироватьSalo пишет:
http://www.arianespace.com/news-mission-update/2014/1124.asp (http://www.arianespace.com/news-mission-update/2014/1124.asp) 

ЦитироватьThe heavy-lift Ariane 5 workhorse will also perform Arianespace's second mission this year – scheduled for March 7 – which is to loft SES' Astra 5B and HISPASAT's Amazonas 4A spacecraft on Flight VA216. 

Пуск назначен на 7 марта по UTC.