No. Relatively small perturbations, including relatively slow pitch changes, could start a little bit of slosh going. If the slosh frequency is resonant with the lag in the control system, then it could quickly become a lot of slosh. Mostly what I need to confirm is that the control system won't reinforce sloshing at any propellant level, or that if it will, the range of propellant levels at which this can occur is relatively narrow, and will pass quickly in normal operation.Since POGO isn't supposed to be pushing the envelope yet for mass ratio, could you just put
some simple baffles into the tank to reduce/eliminate sloshing? I'm thinking you could likely
get by with some screen (made of stainless or aluminum), or thin sheets of Polyethylene. What
are the tanks made of?
Point taken. I'll calculate the fundamental frequency of the slosh (using the pendulum model) and see how they compare to the lag time in the control system. If the slosh frequency is much longer, then there is no problem from that direction.Or you could just do that. It should work fine. If you want though, there's a book in the local
library on rocket propellant tanking. IIRC it has a chapter on calculating slosh effects, etc. If
you would like, I could probably sink a half hour or so into mining some equations from it for
you (or I could send you some photocopies, or something).
~Jon
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