01-30-2019, 12:42 AM
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Craftsman
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Join Date: Aug 2007
Location: Whitehouse, Ohio
Posts: 264
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Attached are my preliminary simulations for the Estes Saturn V, K-36, 1/100th scale with and without the plastic fins. I still need to size and place the body wraps better and include the electrical, pressurization and systems tunnels as well as all the other surface details.
CP with plastic fins is 32.903", stability margin with 3 x C6-3 motors 1.06, altitude 183' AGL. CP with just the balsa fins is 29.770", stability margin with 3 x C6-3 motors 0.52, altitude 208' AGL. Although this suggests that the clear plastic fins might be needed for flight stability RockSim gives a stable flight in 7mph winds with just the balsa fins.
Again I simulated the engine shrouds as one transition section of the same length and overall base diameter. You should be able to open and use these files with Open Rocket freeware http://openrocket.info/.
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Bruce S. Levison, NAR #69055
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