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Loading contentA high-efficiency rocket-engine power cycle in which propellant burned in a preburner drives the turbopumps and is then routed into the main chamber, so almost none is wasted. It is harder to build than the simpler gas-generator cycle but yields higher performance; the Space Shuttle's RS-25 used it, and SpaceX's Raptor uses the even more demanding full-flow staged-combustion variant.
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