05-12-2006, 10:12 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 James Pierson
Nice job on the Goonies Craig. I have a couple of questions for you about school yard sounders. What are the qualifications for a rocket to be considered a school yard sounder? Also what is the minimum altitude that a rocket should attain before ejection? About 100' ??
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It's the idea of using 13mm motors instead of larger motors; and as for altitude, well, it's more like trying to get the best performance for any given design, which in this case would also require very low Dv numbers. Remember also that most schoolyards are small at best, so you're trying to keep the rocket safely in that small field. This might require a larger model than you otherwise might design for a small motor. That Goony Cobra is a good example: It's still a BT-60/BT-50 model, but it gets over 230' on an "A" class motor. Other than that, I'm not terribly picky...  |