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Saturn V did use liquid hydrogen for its second and third stages. One of the original plans for SLS was to adapt and modernize the original Saturn hydrogen engi
by perihelions 4y ago
Saturn V did use liquid hydrogen for its second and third stages. One of the original plans for SLS was to adapt and modernize the original Saturn hydrogen engine, the J-2.
https://en.wikipedia.org/wiki/J-2X https://en.wikipedia.org/wiki/J-2X