NSF - NASASpaceflight.com
@NASASpaceflight · Mar 9, 2021
This is a tricky one given that I believe said helium pressurization was added to the CH4 header tank to mitigate what happened with SN8.
That's why it's a test program, of course.
Elon Musk@elonmusk· Mar 9, 2021@austinbarnard45 SN10 engine was low on thrust due (probably) to partial helium ingestion from fuel header tank. Impact of 10m/s crushed legs & part of skirt. Multiple fixes in work for SN11.
Elon Musk
@elonmusk
Fair point. If autogenous pressurization had been used, CH4 bubbles would most likely have reverted to liquid.
Helium in header was used to prevent ullage collapse from slosh, which happened in prior flight. My fault for approving. Sounded good at the time.
08:18 PM · March 9, 2021 · 0 views
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