ST Alpha - "I believe the sea-level optimized engine has a much smaller (shorter & narrower) expansion bell at the bottom. " (Reading a Post)

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In response to "I wonder if there's any obvious visual difference between the standard Raptor engine and the vacuum version -- nm" by JD

I believe the sea-level optimized engine has a much smaller (shorter & narrower) expansion bell at the bottom.

Posted by howie (aka howie) Sep 4 '20, 17:56

So there will be only 3 RVACs on the second stage, all the other ones will be the sea-level optimized model.

IIRC

Responses:

Thanks. Maybe if I'd pursued advanced degrees or specialized in rocket propulsion, I'd have known that 🤔 - JD Sep 4, 18:09 3
- hey, I just have a BFA in Film & TV. (I only minored in Physics). --nm - howie Sep 4, 18:34 1
  - More physics than I had ;-) -- nm - JD Sep 4, 18:37
- In looking at other pics, I think the left engine is the standard Raptor. The Merlin bell isn't as tall as a person. So 27 of the engines on the left - TWuG Sep 4, 18:16

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