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
You can either use pumps to force the fuel/oxidizer out of the tanks and into the engine or you can have an extra tank of some high pressure, inert gas that you can bleed into the fuel/oxidizer tanks to maintain the flow.
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