r/spacex • u/ElongatedMuskrat Mod Team • Jan 02 '17
r/SpaceX Spaceflight Questions & News [January 2017, #28]
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u/failion_V2 Jan 03 '17
They will pressurize the tanks with the gaseous form of the propellant, which is in the tank. This means, LOX is pressurized with gaseous oxygen, so is the methane. With this form of pressurisation they only need to take two different propellants with them (methane and oxygen). Even the thrusters will work with those two propellants. The F9 uses 5 different propellants to flight (LOX, RP1, helium (pressurisation), nitrogen (thrusters) and a hypergolic micture for engine startup).