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2 votes
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At what altitude is the ISP of a rocket in our atmospehre usually defined? Why is the vaccuum ISP not used for performance evaluations instead?

At what altitude is the ISP of a rocket in our atmosphere usually defined? The most correct answer here is in vacuum, though, as you note, sea-level values are often reported as well. I wouldn't be ...
A McKelvy's user avatar
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30 votes
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How are rockets able to keep their centers of mass in line with thrusters?

Gimballed engines, or other steering methods (vernier thrusters, fuel injection into nozzle, gimballed nozzle, RCS thrusters, differential thrust control), and a broad array of sensors measuring the ...
SF.'s user avatar
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