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Thanks Eric:

I wasn't looking for formula's per se - I've built a bunch over time  
as well....It's just that in a moment of scratching on the back of a  
piece of paper I was wondering how to attack the problem in a  
quantitative way.  Eric Y. suggested looking at terminal velocity,  
which has been a great place to start (I had started by thinking  
about the air column rather than from the object's perspective)....it  
is, or at least appears to me to be, a very complex problem, so I'll  
just have to go back to tinkering, which is where I should be.   
Although I do have a friend from college who is a rocket scientist  
(really) and I think I'm going to write him!
	




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