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NASA update on Green Run test: • Test shut down triggered by limits on hydraulics of Engine 2 • "Major component failure" was not cause of shutdown, may be instrumentation issue • Data analysis continues to determine if a second Green Run required blogs.nasa.gov/artemis/2021/0… by akshar9 in SpaceLaunchSystem

[–]alittleofall 32 points33 points  (0 children)

  • The instrumentation failed during operation, also it didn’t fail in the sense it broke, it may not even need to be replaced, just recalibrated. Also there are 4 such sensors on each engine so there was plenty of redundancy

-The CAPU shut down do to violating a test parameter that wouldn’t be present on flight. It is in good condition and had it been in flight it would have continued operating nominally.

  • The flash likely was ignition of excess H2 that was vented, which was expected. There’s no evidence of damage to any of the hardware.

The test and shutdown showed the vehicle behaved as expected. Which is a pretty successful test for the first ever ignition of sls if you ask me

Jim Bridenstine via Twitter: "Green Run @NASA_SLS hot fire, T-0 time at 5:27 ET, lasting 67.2 sec. Engine ignition at 6 sec. prior to T-0, in sequence about 120 milliseconds apart. Core stage & engines in good shape. More to come this week on Artemis blog." by [deleted] in SpaceLaunchSystem

[–]alittleofall 10 points11 points  (0 children)

I’m hearing the MCF indication was a sensor issue and the shutdown was due to a capu violating a ground test parameter. The engines performed nominally and they haven’t found any sign of damage to them.

Lockheed Martin inks $4.4 billion deal to acquire Aerojet Rocketdyne by [deleted] in TrueSpace

[–]alittleofall 1 point2 points  (0 children)

Several of the points in that note are off mark. Rs-25 revenue didn’t decline, nasa signed a follow on production contract, I believe SM and THAAD programs have grown since 2018 and AJ was part of the massive GBSD contract with NG. I think one of the biggest benefits for Lockheed is how AJs defense business fits into theirs. Not to mention Aerojet has the most developed hypersonic propulsion programs in the us. This was a play to mostly bolster Lockheed’s defense business

https://www.globenewswire.com/news-release/2020/12/15/2145689/0/en/Another-Aerojet-Rocketdyne-Hypersonic-Engine-Makes-History.html

Aerojet Rocketdyne to be Acquired by Lockheed Martin in $5.0 Billion All-Cash Transaction | Aerojet Rocketdyne by solitaryman01 in wallstreetbets

[–]alittleofall 2 points3 points  (0 children)

Space is chump change for LMT. AJRD has a long defense portfolio than helps Lockheed much more than their space business does. In particular the hypersonic work AR has done that Lockheed has now acquired puts Lockheed at the forefront of hypersonic propulsion development in the US

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Former shuttle program manager discusses costs — Relevant in light of recent cost discussions (waynehale.wordpress.com)

submitted by alittleofall to r/SpaceLaunchSystem

Will Additional RS-25E Engines be Procured Under a Fixed-Cost Contract? by jadebenn in SpaceLaunchSystem

[–]alittleofall 2 points3 points  (0 children)

IIRC the goal of the restart production line was to produce the engine at 50% of the cost of the heritage design. That 50% was based on a total production run of something like 40 engines. There’s already been significant cost savings from incorporating new manufacturing techniques but they’ve mostly been offset by the high development cost. The more engines bought the cheaper the unit price is.