#1
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Upscale Groove Tube Swing test question
I tried to swing test my 1.5X Groove tube on the balance point but it wouldn't fly straight. I wasn't sure if it's a nose weight problem or something weird with the tube fins. Will nose weight help and how would I adjust the weight to add?
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#2
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I don't know for sure, but it is possible a design like the Groove Tube could be completely stable in flight, but might not pass a swing test.
Earl
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Earl L. Cagle, Jr. NAR# 29523 TRA# 962 SAM# 73 Owner/Producer Point 39 Productions Rocket-Brained Since 1970 |
#3
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The voice of experience says nose weight, quite emphatically.
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Bill Eichelberger NAR 79563 http://wallyum.blogspot.com/ I miss being SAM 0058 Build floor: Estes - Low Boom SST Semroc - Mini Aero-Dart, Shrike, SST Shuttle In paint: Canaroc - Starfighter Scorpion Unflown: F-22 Air Superiority Fighter, Jayhawk, Multi-Roc, Solar Sailer II, Microsonde 3 Payloader, Aerobee 300, Cyber III, Scrambler |
#4
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What kind of weight do I use? How do I know how much? And how do I add it!
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#5
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Thaanks! I did some research and found a few posts that said nose weight might be needed. I don't have any experience with doing that and would like to get more detailed information on what's involved.
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#6
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If I remember right, I squeezed some epoxy out and dumped about 10-20 bbs in and mixed them up. Then I scraped them off the paper into the hole in the back of the nose cone, and let it dry in a face down position. I wasn't too exacting and must have done okay because I got the chance to lose it twice. Before and after flight pics are included. The after was taken when it was found after wintering in VOA Park. Man, I wish I had bought more of those checkered parachutes when I had the chance.
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Bill Eichelberger NAR 79563 http://wallyum.blogspot.com/ I miss being SAM 0058 Build floor: Estes - Low Boom SST Semroc - Mini Aero-Dart, Shrike, SST Shuttle In paint: Canaroc - Starfighter Scorpion Unflown: F-22 Air Superiority Fighter, Jayhawk, Multi-Roc, Solar Sailer II, Microsonde 3 Payloader, Aerobee 300, Cyber III, Scrambler |
#7
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Just fly it and see.
If it traces it's tail around in a random flight pattern, it needs nose weight. Thaty'll doo.
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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, AGITATION, CHAOS, TURMOIL, FIASCOS, AGGRAVATION, INSTIGATION, NUISANCE-ACTION, and HAVOC ! |
#8
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Did the tube fins tear off in the launch? I'm buillding another Groove Tube. Should I use something stronger than wood glue? CA or epoxy?
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#9
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Quote:
No, they came off after spending the winter in the wilds of the VOA. Someone found the landing site, gathered up the remains, and returned them to me.
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Bill Eichelberger NAR 79563 http://wallyum.blogspot.com/ I miss being SAM 0058 Build floor: Estes - Low Boom SST Semroc - Mini Aero-Dart, Shrike, SST Shuttle In paint: Canaroc - Starfighter Scorpion Unflown: F-22 Air Superiority Fighter, Jayhawk, Multi-Roc, Solar Sailer II, Microsonde 3 Payloader, Aerobee 300, Cyber III, Scrambler |
#10
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I built a BT-60 Groove Tube (1.68x), and it flies great - so far on a D12, and an E26. Haven't tried an E12 yet. I used the Semroc balsa NC, glued in a 1" dowel, with modestly beefy screw-eye. No additional nose weight.
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Paul If we weren't all crazy, we would go insane - Jimmy Buffett NAR #87246 www.wooshrocketry.org |
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