How SpaceX streamlined the Raptor engine

Automated excerpt

SpaceX doesn’t publish any official Raptor schematics, and no one has done a teardown of a Raptor engine. An engine that uses the pressure of the propellant tanks to force fuel and oxidizer into the combustion chamber is called a pressure-fed engine. This is the standard way to build a powerful rocket engine, and virtually every engine used for putting a rocket into orbit uses a pump of some kind to pressurize the fuel and oxidizer. F-1 engine used on the Saturn V rocket.

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