My son's team's rocket engine:
Quote:
PROPULSION
Launch is powered by the 3d printed RBF-1, a 1000 lbf LOX/Methane. RBF-1 uses a pintle injector, providing reliable combustion in a simple to manufacture form factor.
The main combustion chamber is 3d printed with regenerative cooling channels in Haynes 282. These channels help keep the hot-gas side wall temperature below the material's melting point, allowing for engine reuse
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