In article <MHHII.17161$7H7....@fx42.iad>,
jfmezei...@vaxination.ca says...
>
> Apparently, it has now been decided to have 33 engines on Super Heavy.
Initial tests will use 29 engines on Super Booster. Later they'll bump
that up to 33. The Raptors they are going to use are an improved
version with more thrust than initially planned. I'm sure that's part
of the reason for the reduction in engines.
https://www.teslarati.com/spacex-starship-super-heavy-booster-extra-
engine/
Tweet from Elon Musk:
Elon Musk @elonmusk - May 29
29 Raptors on Booster initially, rising to 32 later this year,
along with thrust increase per engine. Aiming for >7500 ton
thrust long-term. T/W ~1.5.
https://techstory.in/spacex-plans-to-boost-starship-raptor-engine-
performance/#:~:text=As%20SpaceX%20managed%20to%20boost,only%20rocket%
20improves%20its%20acceleration.
From above:
As SpaceX managed to boost Raptor 2 performance, the weight is
230 tons of thrust. With a peak lift off at 7600 tons the Super
Heavy Booster with 33 engines is reasonable.
> Also, it is mention only the engines in the middle will gimbal. (Makes
> sense for landing since only those will fire up). But just trying to
> understand the torque aspect. Wouldn't engines on periphery have more
> influence on direction of thrust?
Yes, but you really don't need the outer engines to gimbal. The inner
engines have more than enough control authority.
Jeff
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