this post was submitted on 18 Nov 2023
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And he's now done a more in-depth analysis: Starship & Superheavy Become The Biggest Rocket In Space.... Before Exploding
He speculates that B9 engine failure during boostback was due to either fuel slosh, fluid hammer, or a combination of both. It's unclear whether the booster FTS was triggered or whether the Booster RUD happened on its own.
For S25, he notes that a puff of gas just after T+7 minutes coincides with a drop in the LOx gauge. This indicates an oxygen leak of some sort, which could have any number of causes.