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
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