12-02-2008, 08:26 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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Quote:
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Originally Posted by rkt2k1
...Thanks for the feedback on acceleration / velocity numbers. Exactly the type of feedback I was looking for. Is there a general rule of them for acceleration and velocity numbers off the rod?...
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The general recommended minimum is about 40 FPS safe flight V off the end of the rod. Anything below that is asking for trouble. I don't have my Handbook nearby, but if you notice in the RockSim settings, it has something like 38.99 or 39.99 FPS as the default threshold velocity. That "minimum launch guide length" number is a calculation of where RockSim says the model reaches this velocity. You then compare that number with a typical 36" or 48" launch rod (standard Estes pad). If it exceeds that length (minus about 6", since you lose some at the bottom for attaching the rod...) then you need to increase the power of the motor until the MLGL is within the actual length of the rod. |