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Are throttleable rocket engines less efficient the lower the power setting? Logically that would lead to lower pressures in combustion chamber and so lower thermodynamic efficiency. Or is it remedied by combustion chamber design?

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    $\begingroup$ Did you perhaps mean to post this on space.stackexchange.com? $\endgroup$ – Dan Pichelman Jun 14 '18 at 18:43
  • $\begingroup$ There are numerous questions here about engines, and this is pertaining to rocket powered interceptors, I think it fits here. It's not usual to throttle spacegoing rockets save for vernier engines $\endgroup$ – Francis L. Jun 14 '18 at 20:32
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    $\begingroup$ You've just posted a question about jet engines in Space SE and here's a question about rocket engines in Aviation SE. I'm voting to close both and hopefully you'll get both of them in the right location. If these are the right locations, there won't be further votes and mine will expire. By the way these days practically all rocket engines going to space are throttle-able, and a quick check of questions in Space SE will show this. This shows 200 posts: space.stackexchange.com/search?q=throttle $\endgroup$ – uhoh Jun 27 '18 at 17:27

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