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ЦитироватьIndia readies reusable launch vehicle testbed for flight May 19, 2016 Stephen Clark Artist's concept of India's reusable launch vehicle demonstrator. Credit: ISRO India's space agency plans to boost a sleek winged prototype spacecraft into the upper atmosphere aboard a solid-fueled rocket early Monday on a short test flight that will end with a controlled, unpowered glide to a simulated runway landing in the Bay of Bengal.The reduced-scale space plane features delta wings and angled tail fins, with an outward appearance resembling a mini-space shuttle like the U.S. Air Force's X-37B orbiter.Indian officials hope the testbed is a pathfinder for a future unmanned reusable launch vehicle that could take off like a rocket, deploy a satellite in orbit, and return to Earth and land on a runway.Monday's demo mission an early step in the development of such a launcher, which Indian officials say is likely 15 years from becoming operational.The test vehicle will not reach space on Monday's flight, but a rocket booster will accelerate the craft up to six times the speed of sound within 90 seconds after a vertical liftoff from the Satish Dhawan Space Center, India's launch base on the country's east coast.The launch is scheduled for 0400 GMT (12 a.m. EDT) Monday, according to multiple Indian news reports.After consuming its 9 metric tons (nearly 20,000 pounds) of pre-packed solid propellant, the booster will separate from the space plane as it coasts to a maximum altitude near 70 kilometers (43 miles).Then the craft will pitch its nose up, allowing a heat shield on its belly to take the brunt of the high temperatures generated by the vehicle's speedy descent back into the thick, lower layers of the atmosphere.The technology pathfinder is instrumented with sensors to measure the pressures, temperatures and structural loads it encounters in flight.The Indian Space Research Organization is leading the reusable launcher's development.The Reusable Launch Vehicle-Technology Demonstration program, or RLV-TD, includes a series of test flights designed "to evaluate various technologies, namely, hypersonic flight, autonomous landing, powered cruise flight and hypersonic flight using air-breathing propulsion," ISRO said on its website.Monday's mission, expected to last about 10 minutes from liftoff to splashdown, is known as the hypersonic flight experiment.Its objective is to characterize the aero-thermal dynamics of the winged re-entry craft as it autonomously steers toward a predetermined point in the Bay of Bengal east of the launch site. Engineers will also test the performance of its heat shield, made of silica tiles and a carbon-carbon nose cap, much like the retired American space shuttle.India spent at least $14 million and took five years developing the first flight model for the RLV-TD program, according to the NDTV television news network.ISRO does not plan to recover the vehicle on the hypersonic flight experiment.Future test flights include a landing experiment, a return flight experiment and a scramjet propulsion experiment, ISRO said.An operational reusable launch vehicle based on the winged space plane design will be at least five times larger than the SUV-sized, 1,750-kilogram (3,858-pound) testbed slated to fly Monday.The first model has no on-board engines, while a full-scale reusable launcher will have two stages, carry air-breathing engines, and have conventional rocket thrusters."The cost of access to space is the major deterrent in space exploration and space utilization," ISRO said on its website. "A reusable launch vehicle is the unanimous solution to achieve low cost, reliable and on-demand space access."The European Space Agency tested a similar space plane called the Intermediate Experimental Vehicle last year, but it flew more than 400 kilometers (250 miles) above Earth and reached much faster speeds than India's RLV-TD pathfinder.A.S. Kiran Kumar, ISRO's chairman, told the Hindu newspaper that the hypersonic flight experiment is "a very preliminary step" in the development of a reusable rocket."We have to go a long way," he said, according to the Hindu. "But these are very essential steps we have to take."
ЦитироватьIndia's first-ever 'swadeshi' or indigenous space satellite launch vehicle - dubbed the Re-Usable Launch Vehicle - Technology Demonstrator or RLV-TD - was launched from Sriharikota in Andhra Pradesh at 7 am today. The mission was declared successful 20 minutes after lift-off.
Цитировать http://www.ndtv.com/india-news/exclusive-making-of-indias-space-shuttle-the-inside-story-1408551...Americans successfully flew their space shuttles 135 times until they retired it in 2011 over cost constraints and the Russians flew it only once in 1989. .....
ЦитироватьThe proposed RLV is designed in two parts; a manned space plane rigged atop a single stage, booster rocket using solid fuel. The rocket is expendable while the RLV would fly back to earth and land like a normal aeroplane after the mission.
Цитироватьhttp://www.isro.gov.in/update/23-may-2016/india%E2%80%99s-reusable-launch-vehicle-technology-demonstrator-rlv-td-successfullyMay 23, 2016India's Reusable Launch Vehicle-Technology Demonstrator (RLV-TD), Successfully Flight TestedToday, May 23, 2016 ISRO successfully flight tested India's first winged body aerospace vehicle operating in hypersonic flight regime. In this experimental mission, the HS9 solid rocket booster carrying RLV-TD lifted off from the First Launch Pad at Satish Dhawan Space Centre, Sriharikota at 07:00hr IST. After a successful flight of 91.1second, HS9 burn out occurred, following which both HS9 and RLV-TD mounted on its top coasted to a height of about 56 km. At that height, RLV-TD separated from HS9 booster and further ascended to a height of about 65km. From that peak altitude of 65 km, RLV-TD began its descent followed by atmospheric re-entry at around Mach 5 (five times the speed of sound). The vehicle's Navigation, Guidance and Control system accurately steered the vehicle during this phase for safe descent. After successfully surviving a high temperatures of re-entry with the help of its Thermal Protection System (TPS), RLV-TD successfully glided down to the defined landing spot over Bay of Bengal, at a distance of about 450km from Sriharikota, thereby fulfilling its mission objectives. The vehicle was successfully tracked during its flight from ground stations at Sriharikota and a shipborne terminal. Total flight duration from launch to landing of this mission of the delta winged RLV-TD, lasted for about 770seconds.In this flight, critical technologies such as autonomous navigation, guidance & control, reusable thermal protection system and re-entry mission management have been successfully validated.ISRO acknowledge the support of Indian coast guard and National Institute of Ocean technology (NIOT) for the mid sea wind measurement and shipborne telemetry respectively in this mission.
Цитироватьknezevolk пишет: А в чем принципиальное отличие от Шаттла? Как удастся избежать ошибок американцев?
Цитироватьknezevolk пишет: А в чем принципиальное отличие от Шаттла?
ЦитироватьAir-Breathing Propulsion System (ABPS) which is planned for advanced space launches including next Reusable Launch Vehicle (RLV) uses atmospheric air as oxidiser for combustion with vehicle fuel to propel the rocket. This can bring down space travel cost by 1/10th and eventually 1/100th, VSSC scientists said.
ЦитироватьTHIRUVANANTHAPURAM: A little over a year since the successful flight test of the first prototype of the futuristic Reusable Launch Vehicle - Technology Demonstrator (RLV-TD), ISRO is gearing up for a second go. Only this time, the prototype will 'land' on land instead of water.Work is progressing at the Vikram Sarabhai Space Centre (VSSC) here on the second RLV-TD. A senior officer associated with the project said the RLV-TD will almost be a ditto version of the first scaled-down RLV-TD with the only exception being it will have landing gear.ISRO sources said it may take another year for the model to be ready. They said the present plan is to launch the RLV-TD from Sriharikota and land it on an undisclosed Air Force airfield in the eastern sector. This is yet to be finalised though, they said.СпойлерThe unmanned RLV-TD comprises a space shuttle-like component fitted atop a booster rocket. The first RLV-TD weighing 1.5 tonnes, was successfully launched from Sriharikota on May 23 last year and splashed down in the Bay of Bengal from a height of 64.8 km.While VSSC is primarily responsible for building the RLV-TD, the navigational equipment are being provided by the ISRO Inertial Systems Unit in Thiruvananthapuram and ISRO's Satellite Applications Centre, Ahmedabad. Hindustan Aeronautics Ltd is responsible for the landing gear.In fact, ISRO plans a series of TDs before attempting to build a fully-fledged vehicle that can be reused for launching satellites. A subsequent TD will possibly involve a slightly larger vehicle which will place a nano-satellite in the orbit.[свернуть]