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Old 03-02-2016, 11:10 PM
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mwtoelle mwtoelle is offline
Flying since 1977
 
Join Date: Oct 2010
Location: Middle TN
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OpenRocket, RockSim, and the commonly used Barrowman Equations will give incorrect CP information if you have fins on a transition. Someone else with the appropriate math and aero engineering background will need to work out the equations to handle fins on a transition properly. The other method would be to put the model in a wind tunnel and find the CP that way. Referring to the V-2, the rocket should balance about one-half of the main body diameter in front of the boattail if the model has scale sized fins in a flight-ready state.
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Mike Toelle

NAR 31692 L1

SAM 0373
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