08-14-2016, 08:42 PM
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Freeform rocketry advocate.
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Join Date: Jan 2008
Location: Claremont, CA "The intellectual capitol of the world."-WSJ
Posts: 3,780
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I used to fly my Saturn V's with a cluster of either 2 or 3 D12-3 motors. It is reasonable with that much initial thrust. 29mm mount and the cluster hangs just out of the recessed inner ring. I mostly used Centuri Saturn V's.
That said, a 3" OD would do the trick with existing stock motors.
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