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Stoke Space test-fires new booster engine
(spacenews.com)
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Full-flow staged combustion is what the SpaceX Raptor uses. While also intending to reuse both first and second stages (again, like SpaceX), they are taking a very different approach to second stage propulsion and reentry
Interestingly, Nova's actively cooled heat shield design bears some resemblance to one of the early Starship designs, though I think SpaceX was planning to "sweat" methane rather than recirculate hydrogen.