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Feb 24, 2009, 12:30 AM
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Starting work on a Supra


Inspired by the build logs of others, I'll attempt to document my progress while I build a couple Supra's.

I figured the wing was the place to start. I started by laying poster board templates for the foam. Marking out the spar, hinge and other stuff.

Templates are cut from 1/8" phenolic. I think they might be a bit thick but that's all they had at the plastics store. I could use counter top laminate but...they're already cut, and I hate cutting templates.

Blocking out the foam I discovered I'll need a new bow. The center sections are 31" long and my current bow is only about 25". I'd been having trouble cutting foam. Always got a washboard surface. My old bow used 3/16" arms about 10" long. My new one has 7/32" arms about the same length. With a lot more tension on it the cuts are perfect. The longer bow has 1/4" arms, even more tension. They're made from 1" aluminum tube from the hardware store and hardwood stuffed in each end to hold the arms. I used some leftover oak for the larger bow and discovered that oak splits easy. When I tried to tension the wire the arms just split the oak. So, using some kevlar thread I thought I'd test just how well wrapping a joiner box would work. The wraps made all the difference.

Next step is to cut the foam. I've ordered the carbon bit's for the spar from ACP this afternoon.

Thanks for looking,
davidk
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Mar 02, 2009, 11:31 AM
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wingbeat's Avatar
Thanks for the foam cutting lessons. I'll be watching this one.


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