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Re: Propellant fluid dynamics at zero-g

Well, I can't stay silent anymore.  

I read a book called "P3D to P3G" {yep, the same one} and it says in the
first article near the end in the section called Propulsion Systems {and I
quote}:  "Helium gas from a high pressure storage tank is reduced to the
system operating pressure by a regulator...snip...Helium is then fed to the
propellant tanks through redundant check valves to force the propellant
into the motor.  Ullage is provided by spinning the spacecraft up before
and during each burn to assure proper flow."

So the main force that causes fuel to flow into the engine is helium gas
pressure.  Simple, huh!


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