06-15-2010, 03:13 PM
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BARCLONE Rocketry
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Join Date: Mar 2005
Location: Mobile, Alabama
Posts: 5,357
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Two-Stage Sentinel [Estes #1987]
This is a thread for the development of a two-stage version of the OOP Estes kit. A question was raised about the possibility of modifying the design, and I've got a few results of some RockSim testing.
In the original post, I suggested the forward fins were too small, and the model would be unstable without some additional fin area, such as pop-out tabs. RockSim confirms the upper section, using stock fins, would be completely unstable. The static margin with just a B6-6 is a minus 0.14.
What I will try to do is adjust the length and fin area slightly until I reach a happy compromise without degrading the original appearance.
Stay tooned...
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