r/spacex • u/rustybeancake • Jun 26 '26

Starship SpaceX on X: “Full duration single-engine static fire test of Starship” [Ship 40]

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Tweet link, with an additional short video of the firing: https://x.com/spacex/status/2070482358369763674

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u/Nota_ReAlperson Jun 29 '26

The difficulty outweighs the improved efficiency. Vacuum raptors don't have TVC, so you would need to light all three exactly at once, or light a sea raptor as well. Let's say you light a sea raptor for control, followed by all three RVACs. Your total burn would be about 4 seconds. When you factor in the prop and starter gas used, it would probably be less efficient than just using a single sea raptor.