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Questions about rocket oxidizer, propellant, reactive mass, or other fuels used in spacecraft or rockets.

19 votes
4 answers
8k views

What is the best chemical rocket fuel from a purely specific impulse standpoint?

A variety of different rocket programs use a variety of different fuel types. … Researching this, the main fuel combinations I saw were: RP-1 / LOX (SpaceX's Falcon rockets, early stage Atlas and Saturn rockets), methane / LOX (SpaceX's Starship), HTPB (ISRO's PSLV), PBAN (NASA's …
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