02-17-2009, 10:00 AM
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Old Far...er...Rocketeer
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Join Date: Mar 2005
Location: Plano, TX resident since 1998.
Posts: 3,965
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Quote:
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Originally Posted by Solomoriah
I suspect the 3 second delay will severely limit clustering the A10-3T. It's a hard-kicking engine with almost no follow-through; a heavy enough rocket to hold it down to a low DV might be too heavy for the low tail of the thrust curve.
Just musing, no simulations or data to back it up.
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Think drag, not mass.
I've run many sim's trying to adjust the coast time to fit a given motor only to learn that coast time is surprisingly flat over a wide range of mass values. The heavier rocket will burn out at a lower altitude with a lower velocity, but with the added mass, its coast time will be about the same.
So if you want a rocket to have a short coast time for use with a cluster of A10-3T's, use draggy construction: large but light body tubes such as the BT-100 or BT-101, unswept fins with no airfoiling, six fins instead of 3 or 4, a ring tail or tube fins. These are the tricks for cutting the coast time.
Doug
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