New finding of the day: I never knew that there was a rocket engine in service that uses the hydrazine/LOX fuel combination, much less it flew something like 160 times in the 1960s/70s! https://en.wikipedia.org/wiki/RD-119
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Huh! And that Korolev turned up his nose at it because of the UDMH (even though it gave it a better specific impulse than some other fuel combos)
Korolev did the same later when Glushko offered his engines for the N1, meaning that he had to look elsewhere for the engines!
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interesting!
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