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Old 05-04-2006, 09:25 PM
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Default RE: 1/2a speed plane wing design

Chris, I take a sharp, fine line marker pen and draw contour lines to help keep track of my progress, when it comes to removing wood. The fiberglassing in the center of the wing adds lots of strength, but I think Tim is being pretty brave to turn a G&Z powered plane loose without a spar [X(]! I think setting the high point of the airfoil at 40% chord line is a good spot. Your contour lines should be based on that. Just go for smooth, flowing curves with no flat spots or dips. I attack the wood with 80 grit on a sanding block after the rough planing, then go to 120, then 220. It is easy to go overboard, so watch your progress. Practice makes perfect, so buy a few slabs of light weight 1/4" and get busy!
For the fuselage, I recommend 7" from the spinner back plate to the wings' L.E., a 6" root chord, and a total length of about 23" from front to the back edge of the "boat tail", where the fuselage sides meet. I let the elevator hinge line fall there, and go with a one piece elevator
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