ST Alpha - "A SpaceX Merlin engine (l) next to a Raptor engine (r). There are 9 Merlins on a Falcon rocket. There will be 27 Raptors on a Starship -- (link)" (Reading a Post)

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A SpaceX Merlin engine (l) next to a Raptor engine (r). There are 9 Merlins on a Falcon rocket. There will be 27 Raptors on a Starship -- (link)

Posted by TWuG Sep 4 '20, 17:41

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https://twitter.com/SpaceX/status/1302038129990279168?s=19 (twitter.com)

Responses:

I wonder if there's any obvious visual difference between the standard Raptor engine and the vacuum version -- nm - JD Sep 4, 17:48 5
- I believe the sea-level optimized engine has a much smaller (shorter & narrower) expansion bell at the bottom. - howie Sep 4, 17:56 4
  - 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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