06-01-2009, 01:55 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 am thinking the increased diameter makes the initial thrust slug last considerably longer, perhaps 50% more, which is a BIG factor in liftoff safety. Most model rockets are over optimum mass to begin with, so this brings the power unit closer to the airframe unit on the optimum weight (for altitude) continuum.
Plus they are cool and the pictures rock!
Jerry
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