#31
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The BNC-55AO balsa nose cone is available from eRockets:
http://www.erockets.biz/semroc-bals...l-sem-bnc-55ao/
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Lee Reep NAR 55948 Projects: Semroc Saturn 1B, Ken Foss Designs Mini Satellite Interceptor In the Paint Shop: Nothing! Too cold! Launch-Ready: Farside-X, Maxi Honest John, Super Scamp |
#32
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Thanks. Color me embarrassed. Just after I posted my question, I noticed another Goblin thread that contained the answer. I even dug in to my stash of SEMROC parts and discovered at BNC-55AO! Now, another question - if I swap out the plastic cone for the balsa, will nose weight be needed?
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Got a Caribbean soul I can barely control..... |
#33
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I have an original from the early 70's and it doesn't have any nose weight added. I think it would depend on what type of streamer you use. Mine is crepe paper and maybe 7ft long. When coiled it has some substance. If I was going to use a shorter, plastic streamer I would most likely put a washer under the screw eye.
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#34
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Thanks, sounds good! Might have to try the old string stability method . I can see it now. Our neighbors wondering why their 63 year old neighbor is whipping a rocket around his head!
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Got a Caribbean soul I can barely control..... |
#35
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I would suspect the stock Goblin is a very, very stable design. Those are some pretty big fins, and I would almost conjecture that it might be stable with just three fins (mounted in a standard three fin 120 degree configuration).
But, checking via a swing test or some CP/CG calculations won’t hurt. The quickie ‘cardboard cutout’ CP test would be easy on this one. Earl
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Earl L. Cagle, Jr. NAR# 29523 TRA# 962 SAM# 73 Owner/Producer Point 39 Productions Rocket-Brained Since 1970 |
#36
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Thanks! I dug up a copy of the original Estes kit instructions, and there is no nose weight listed in the parts list. So I'll still check the stability but I think we're good.
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Got a Caribbean soul I can barely control..... |
#37
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Guaranteed that a properly filled/sealed/sanded/painted BNC-55AO weighs more than a PNC-55AO.
You will not have any stability issues with the balsa cone.
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When in doubt, WHACK the GAS and DITCH the brake !!! Yes, there is such a thing as NORMAL, if you have to ask what is "NORMAL" , you probably aren't ! Failure may not be an OPTION, but it is ALWAYS a POSSIBILITY. ALL systems are GO for MAYHEM, CHAOS, and HAVOC ! |
#38
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The Semroc version doesn't have nose weight either, and it flies fine on D12-7s. I tried an E12, but it went KABOOM on the pad. Entertaining, in any case!
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Paul If we weren't all crazy, we would go insane - Jimmy Buffett NAR #87246 www.wooshrocketry.org |
#39
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Thanks!
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