Looking for BT-21 or BT-20+ and odd items
Hi folks, So in my attempt to scratchbuild a Fake Wulf I have been gathering parts. What I cannot find is a BT-20+ or also called BT-21 tube I guess, and also a pretty thick 21-55 balsa centering ring. Everything else was easy enough to find, but these, well not so much. Anyone have any idea where I might buy these items?
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Try BMS or Semroc
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Not having the tube dimensions, I'm going to guess that the BT-20+ tubing is a slip fit over BT-20. This vintage Totallu Tubular product? http://www.erockets.biz/totally-tub...t-20-34-1-pk-1/ Or maybe the ASP variation? https://www.asp-rocketry.com/ecomme...nt=13&navPanel= ST-7 is larger than BT-20 and not a slip fit over BT-20: http://www.erockets.biz/st-7/ |
Thanks everyone, so far.........
I have found everything except the 21-55 thick balsa centering ring.............but I have some leads.....
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BT-30 is an old Estes size.
OD: 0.767 ID: 0.725 Not sure where BT-20+ originated. OD 0.770" ID 0.744" eRockets (Semroc) has both. You can take a regular 20-55 centering ring and sand it until it fits. Otherwise, print out a template and cut your own. I seldom buy centering rings anymore. I usually make them from cardboard or balsa. . |
Are you doing a build thread on the scratch Fake Wulf?
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Why not just sand or “Dremel-out” a fiber 2055 centering ring? BMS has those. The fiber is really tough, and lightweight. I realize you found the other parts, but for for the benefit of others, BMS, stocks several “+” style tubes that slide over a regular tube. |
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BT-20+ may be what CMR called RB-77. Their regular tube was RB-74, and RB-77 was a slip-fit over it. Apogee (Ed LaCroix version) had similar sizes of their BlackShaft tube (and maybe their regular tube too) |
This tubing is on erockets.biz It is also available on the ASP website. Just a slight bit smaller in diameter than the Quest size T-20 available from BMS. It should be a simple matter to enlarge the rings. A sheet of sandpaper wrapped around an engine casing works well. BTW,, the t-20+ tubes will probably be discontinued due to the change in the NAR payload requirements. Apparently it was too challenging. LOL.
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I believe that the "+" usage came from Totally Tubular.
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