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  #31  
Old 04-19-2020, 09:34 AM
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As said before the same tube but longer was used in the Venus Probe. 25 years ago, I also noticed a tube of the same diameter and thickness used in the AAA Transonic 775, which I used to repair my original Skywinder after a weak ejection in an MRC motor failed to deploy the blades. The first picture shows a piece of one of those tubes on right, and the Replacement tube TT-20+ in the center and the BT-20 on the left. The second pic shows a test fit of the BT 20 fit onto the stop inside the slide, with the TT-20 plus over that, still loose. The AAA catalog page shows the correct tube could be had back then, “BT-20HD”.
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Last edited by 5x7 : 04-19-2020 at 06:46 PM.
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  #32  
Old 04-19-2020, 10:02 AM
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Here is the sarting point, the blades yellowed from being exposed all summer laying in a clearing inside a thick patch of bushes and small trees. I had a line on it so found it after the leaves fell. The first pic doesn’t show it, the tube was unraveled but the plastic parts were ok, the D12 was yanked out, the motor mount is rough but useable, and the old quest engine hook is rusted but I think it will work. One rotor has crack so will be repaired with packing tape which works well for these blades.
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Last edited by 5x7 : 04-20-2020 at 06:30 AM.
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  #33  
Old 04-19-2020, 10:15 AM
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I used a Totaly tubular TT-20+ from Erockets and a BT-20 nested, cut to 9.25 inches, which makes a perfect replacement for the Skywinder tube. I used the NCR Kuhn cutter to cut both tubes and used Tightbond III on about an inch of the the tube ends, then quickly slid the tubes together so they wouldn’t freeze, so only the ends are glued. I think this is ok since the gluing surfaces for the slide stop and fin can rotor hub are both internal, inside the BT-20. The outer tube provides strength and is the correct outer diameter for the vent slide/rotor release. You could repair a Skywinder with a BT-20 only, but the nosecone slide/vent assembly would be a bit loose and would probably kink the tube on landing.
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Last edited by 5x7 : 04-19-2020 at 11:14 AM.
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  #34  
Old 04-19-2020, 10:22 AM
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After the tube dried, I beveled the inside edge of the slide ‘fingers’ so the edge of the tube wouldn’t catch when being slid into the slide onto the stop. Then I used JB weld to join the tube to the plastic slide assembly. The next repair was a wrap of silver tape around the slide to reinforce the retainer ring that is soft after being in the elements. The last picture shows the completed rocket after the other end of the replacement tube was joined to the original red coupler with Titebond III.
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Last edited by 5x7 : 04-19-2020 at 11:07 AM.
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