RE: slosh (was Re: Armadillo May 2, 2004)

Either in tank fixed baffles, or tank liners would seem to me to be the way 
to solve slosh.  For a vehicle that gets to orbit, tank liners would allow 
for engine restart, in zero G, without the pressurant gas blowing straight 
through the fuel/oxider in the tank.


Tony Fredericks                 "Mind that bus!"
Amateur Rocket Scientist        "What Bus?"
E.R.P.S. Member                 SPLAT!! - Arnold Rimmer





>From: Henry Spencer <[email protected]>
>To: ERPS <[email protected]>
>Subject: slosh (was Re: [ERPS] Armadillo May 2, 2004)
>Date: Mon, 3 May 2004 19:08:25 -0400 (EDT)
>
>On Mon, 3 May 2004, John Carmack wrote:
> > If we find slosh to be an issue, our easiest correction will be to float 
>a
> > bunch of stainless steel balls in the tank, which is effectively what 
>they
> > did on Vanguard.
>
>Mmm, I'm not sure that will be very effective.  (I assume by "balls" you
>mean "floats".)  For cylindrical tanks, the main slosh mode is the surface
>going up on one side and down on the other, with actual liquid motion
>mostly somewhat below the surface.  I don't think floats are going to damp
>this very well.
>
>Vanguard was too skinny to have much of a slosh problem anyway -- it's
>almost entirely a function of diameter.  (Redstone at 178cm -- half again
>the diameter of Vanguard -- had no slosh problem, while Jupiter at 267cm
>had a serious one.)  Floats are more often used to try to isolate the
>propellant from the pressurant gas.
>
>                                                           Henry Spencer
>                                                        [email protected]
>
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