12-12-2018, 04:55 PM
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Craftsman
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Join Date: Aug 2007
Location: Whitehouse, Ohio
Posts: 264
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If you use the geometric equivalence technique for ring fin simulations I came up with about 18 years ago (I used it with RockSim but it should also work for OpenRocket) : https://www.apogeerockets.com/educa...ewsletter27.pdf
You get almost the same result as with the single offset tube fin approximation; Cp = 11.76 in for my technique versus 12.167 in using the offset tube fin, see attachments.
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Bruce S. Levison, NAR #69055
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