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Re:SpaceX test flight of Starship SN-5 [video] by codeulike on Wednesday August 05, 2020 @11:04AM (#24061592)
Full flow staged combustion cycle, never been flown* before, explained here:

https://everydayastronaut.com/raptor-engine/

* The Russians built one in the 60s but it never got past static fire tests

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