Rockets have big tanks for liquid fuel, but wouldn’t the fuel float freely in the tank while sitting idle in orbit? Like when one is aligned and waiting to burn, what is making sure that the fuel is being piped into the engine?
In: Engineering
This is why rockets often have what are called ‘ullage motors’, which are small pressurised-gas thrusters that give the ship a bit of acceleration so that the fuel in the main tank will all get caught at the ‘bottom’ as the ship moves.
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