Iirc cold gas thrusters are used before ignition to provide some acceleration to... | Hacker News

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chasd00 8 months ago | parent | context | favorite | on: Starship Flight 5: Launch and booster catch [video...

Iirc cold gas thrusters are used before ignition to provide some acceleration to force the fuel to the bottom of the tank.

baq 8 months ago [–]

The technical term for that is 'ullage'.

See also: https://en.wikipedia.org/wiki/Ullage_motor

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