03-20-2010, 10:39 AM
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Incurable SEMROC Fan
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Join Date: Mar 2005
Location: Twin Falls, Idaho, USA
Posts: 2,319
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Craig's right... AGAIN!
Quote:
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Originally Posted by CPMcGraw
Slowing the rocket down just a tad by way of drag instead of by mass. Adding mass can bite you -- it makes the model fall faster, even under the parachute, which means higher impact V with the ground. By using drag, the increase in mass is minimal, so the descent rate remains lower.
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Quote:
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Originally Posted by Doug Sams
BTW, not only does adding mass increase descent weight, it also increases separation forces imparted to the recovery harness. So, while that 30mph Dv is hard on the recovery system, so too is the extra ounce of mass at the screweye.
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Craig and Doug,
Thanks for your input! After sleeping on it, I think Craig's idea of increasing the fin size by 25% is probably the best way to go with this design. As for the Prometheus... The 175% SLS version works just fine, but the 100% version still has relatively high deployment speeds.
Maybe the solution is a Really Big Streamer? (See third picture.) But that means finding one big enough to slow this model down... (thinking really hard)
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__________________
Jay Goemmer
"Centuri Guy"/"Tau Zero"
YORF Member 28
Semroc SAM #0029
NAR 86131
"I think about organizing things all the time. Never seems to happen. I find something that piques my interest and I'm off on a quest. Or a Centuri.   "
--Bill Eichelberger, 02/22/2022
“Centuri fret buzz in an updated form.”
Bill “Wallyum” Eichelberger re: Estes Flutter-By
03 Sept 2014
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