SLS - space launch system (3-я попытка)

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О планируемой трансляции теста RS-25

https://www.nasa.gov/multimedia/nasatv/schedule.html

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AUGUST

August 14, Tuesday
3:20 p.m. – RS-25 Rocket Engine Test at the Stennis Space Center with NASA Administrator Jim Bridenstine (All Channels)

19:20 UTC

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Chris B - NSF‏ @NASASpaceflight 25 мин. назад

FEATURE ARTICLE:
Digging into the details of Orion's EM-1 test flight -

https://www.nasaspaceflight.com/2018/08/digging-details-orions-em-1-test-flight/ ...

- By Philip Sloss. (Epic EM-1 Render by Nathan Koga @kogavfx for NSF/L2)

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Chris G - NSF‏ @ChrisG_NSF 1 мин. назад

Shuttle-era RS-25 liquid rocket engine resumes production restart development testing. Test T0 (ignition) is 15:20 EDT (1920 UTC) today - subject to change per test condition. NASA Administration @JimBridenstine is expected to be in attendance.

ARTICLE:
https://www.nasaspaceflight.com/2018/08/rs-25-resumes-production-restart-development-testing/ ...

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Chris B - NSF‏ @NASASpaceflight 11 мин. назад

STATIC FIRE! RS-25 E5025 has ignited on the A-1 test stand at the Stennis Space Center.

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Chris B - NSF‏ @NASASpaceflight 19 мин. назад

Do you have an icing problem on your powerhead? Try Ignition!

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Chris G - NSF‏ @ChrisG_NSF 8 мин. назад

If it was an early shutdown, remember: this was a test to root out issues and problems as the RS-25 production restart begins. @NASA tests extensively - as does @SpaceX, @ulalaunch, @blueorigin, @northropgrumman - to ensure engine issues don't present in flight.

Chris B - NSF‏ @NASASpaceflight 12 мин. назад

NASA admin talking about this being 500 seconds (and it was supposed to be full duration).....pretty sure it was only about five minutes and shutdown early, we'll check.

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Chris B - NSF‏ @NASASpaceflight 14 мин. назад

Yep. Confirmed early shutdown (aborted). It's happened before and they repeated the test about a week or so later. Bit awkward for the NASA admin to go on camera and say "that was 500 seconds of heart pounding power".

Stennis Space Center‏Подлинная учетная запись @NASAStennis 15 мин. назад

Today's RS-25 Engine Test @ NASA's John C. Stennis Space Center has concluded with a duration of 319 seconds. #SLSFiredUp

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SLS RS-25 Engine Test, 14 August 2018

SciNews

Опубликовано: 14 авг. 2018 г.

NASA conducted a new test of a flight controller installed on the Aerojet Rocketdyne developmental RS-25 rocket engine No. 0525. The 319 seconds hotfire test was conducted on the A-1 Test Stand at the John C. Stennis Space Center in Mississippi, on 14 August 2018, at 19:41 UTC (14:41 CDT, 15:41 EDT). NASA's Space Launch System (SLS), the most powerful rocket ever built, will be powered by four RS-25 engines firing simultaneously.

(6:35)

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NASA Stennis Live Stream

NASA Stennis

Трансляция началась 1 час назад

(21:25)

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Chris B - NSF‏ @NASASpaceflight 41 мин. назад

The RS-25 test at Stennis suffered an "early cut" (abort) issued by the test conductor at 319 seconds when at 111% RPL. Was a Liquid Hydrogen transfer initiation issue. Likely a facility issue, not the engine. Test objectives were still achieved!

UPDATED:
https://www.nasaspaceflight.com/2018/08/rs-25-resumes-production-restart-development-testing/ ...

Спойлер

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https://spacenews.com/nasa-says-rs-25-engine-test-a-success-despite-ending-early/

NASA says RS-25 engine test a success despite ending early
by Jeff Foust — August 15, 2018


An RS-25 engine performs a static-fire test at NASA's Stennis Space Center Aug. 14. NASA said the test was a success despite ending three minutes early because of a "facility issue." Credit: NASA Stennis

WASHINGTON — NASA says an Aug. 14 test of an engine for the Space Launch System was a success despite an unspecified "facility issue" that caused the test to end early.

The test of the RS-25 engine on the A-1 stand at the Stennis Space Center in Mississippi was the first in a new series of static-fire tests of the shuttle-era engine that will be used in the core stage of the SLS. The engine, a developmental unit designated No. 0525, tested a flight controller unit that will be used on flight models of the engine as well as new manufacturing techniques intended to reduce the cost of future engines.

NASA Stennis announced prior to the test that the test would run for eight minutes and 20 seconds. However, in a tweet after the test, Stennis said the test ended after five minutes and 19 seconds.

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Stennis Space Center‏Подлинная учетная запись @NASAStennis 14 авг.

Today's RS-25 Engine Test @ NASA's John C. Stennis Space Center is now targeting a 2:38 p.m. (CDT) start for a scheduled duration of 500 seconds #SLSFiredUp

Stennis Space Center‏Подлинная учетная запись @NASAStennis 14 авг.

Today's RS-25 Engine Test @ NASA's John C. Stennis Space Center has concluded with a duration of 319 seconds. #SLSFiredUp

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An Aug. 15 statement fr om Stennis about the test made no mention of the planned or actual duration of the test. "All test objectives were met during the hot fire," the center's statement noted.

Stennis spokesperson Valerie Buckingham confirmed Aug. 15 that the test was cut short. "The test ended early due to a facility issue, but all test objectives were met," she said in an emailed response to a SpaceNews inquiry. She later said she didn't know the details about the problem, other than it did not damage the engine itself.

Aerojet Rocketdyne, which manufactures the RS-25, also said the test ended early because of a facility problem, but deferred questions on the issue to NASA Stennis. The company said in a statement that the engine performed as expected.

Among the objectives of the test was to test a new manufacturing approach called hot isostatic pressing for the engine's main combustion chamber that the company says "saves considerable time and money" over conventional techniques. "Initial test data indicates the chamber performed flawlessly during the 319-second test," Aerojet Rocketdyne said.

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That technique is being evaluated for use on future versions of the RS-25. The first four SLS missions will use existing engines, originally manufactured for the space shuttle and updated for SLS. Later SLS launches will require new RS-25 engines.

"As we develop a new generation of RS-25 engines, ensuring they continue to remain reliable while reducing costs is a major focus at Aerojet Rocketdyne," said Eileen Drake, chief executive and president of the company. "That's why we're working hard to drive down costs on the RS-25 by incorporating the most modern and efficient manufacturing techniques."

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NASA is planning eight more tests using the same developmental RS-25 engine that will go through early 2019. Later in 2019, another test stand at Stennis will host a "green run" static-fire test of the first SLS core stage, where its four RS-25 engines will fire simultaneously.

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Among those attending the test was NASA Administrator Jim Bridenstine, making his first visit to Stennis since becoming administrator. The visit was part of a series of appearances at NASA facilities in the region that included the Michoud Assembly Facility in New Orleans Aug. 13 and the Marshall Space Flight Center in Huntsville, Alabama, Aug. 15.

In a webcast of the launch, Bridenstine didn't appear to be aware that the test had been cut short. "I've seen a lot of launches as a member of Congress before and now as NASA administrator, but the rockets always leave," he said. "In this particular case, the rocket stayed, and it stayed for 500 seconds of just a heart-pounding thrust."

He reiterated the importance of the SLS in carrying out human missions to the moon and beyond despite the vehicle's years of delays. "This is our opportunity to follow through on the president's Space Policy Directive 1, which says that we're going to the moon," he said, saying the SLS fits into a "sustainable" architecture wh ere "we want every piece of this architecture to ultimately be reusable." The SLS is currently an expendable vehicle, including the original shuttle-era RS-25 engines that were designed for reuse.

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Chris B - NSF‏ @NASASpaceflight 6 мин. назад
 
ARTICLE:

Boeing team challenges focusing SLS Engine Section work -

https://www.nasaspaceflight.com/2018/08/boeing-challenges-focusing-sls-engine-work/ ...

- By Philip Sloss (Business end SLS render by Nathan Koga @kogavfx for NSF/L2)

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Chris B - NSF‏ @NASASpaceflight 20 мин. назад

Crawler Transporter -2 (CT-2) and Mobile Launch Platform -3 (MLP-3) are returning home from their road trip. Includes preps for the end of the month rollout of the huge SLS ML to 39B.

That's SpaceX's 39A in the background, with the CAA install taking place.

Evan Richard‏ @TheEvangineer

В ответ @NASASpaceflight

Crawler getting in on all the excitement again today



11:16 - 20 авг. 2018 г.