#ullage_motor
Ullage motor
Small rocket engines that help fuel settle in 0g before main engine start
Ullage motors are relatively small, independently fueled rocket engines that may be fired prior to main engine ignition, when the vehicle is in a zero-g situation. The resulting acceleration causes liquid in the rocket's main tanks to settle towards the aft end, ensuring uninterrupted flow to the fuel and oxidizer pumps.
Sun 21st
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