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Hybrid Propulsion

Hybrid A rubbery fuel Rocket propellants come in two parts, fuel and oxidizer, which work together to keep an engine burning. SpaceShipOne burns a material called hydroxy-terminated polybutadiene (HTPB), a common ingredient in tyre rubber, as fuel with nitrous oxide serving as the oxidizer. According to press statements by Scaled, the combination was chosen for SpaceShipOne after... »