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  #1  
Old 06-02-2023, 09:50 AM
bobdros bobdros is offline
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Default 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  
Old 06-02-2023, 01:41 PM
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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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  #3  
Old 06-02-2023, 05:15 PM
A Fish Named Wallyum A Fish Named Wallyum is offline
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The voice of experience says nose weight, quite emphatically.
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  #4  
Old 06-03-2023, 06:52 AM
bobdros bobdros is offline
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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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Old 06-04-2023, 05:41 AM
bobdros bobdros is offline
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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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Old 06-04-2023, 10:03 AM
A Fish Named Wallyum A Fish Named Wallyum is offline
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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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  #7  
Old 06-04-2023, 01:19 PM
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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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Old 06-04-2023, 04:36 PM
bobdros bobdros is offline
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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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Old 06-05-2023, 05:14 AM
A Fish Named Wallyum A Fish Named Wallyum is offline
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Quote:
Originally Posted by bobdros
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?

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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Build floor: Estes - Low Boom SST Estes D.O.M. - Space Freighter Semroc - Shrike, SST Shuttle

In paint: Canaroc - Starfighter Scorpion

Unflown: Estes - Der Red Jinx, F-22 Air Superiority Fighter, Jayhawk, Multi-Roc, Solar Sailer II, Microsonde 3 Payloader, Aerobee 300, Cyber III, Scrambler
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  #10  
Old 06-11-2023, 07:42 AM
PaulK PaulK is offline
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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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