The high-line of the airfoil can be anywhere between 1/4 to 1/2 back from the leading edge. To answer the original question, the airfoil should begin at the leading edge of the wing.
#Glider airfoil pdf
pdf “Accurate Shaping of Solid Balsa Surfaces” in the Related Construction Notes of this page: There is quite a bit of information on the web regarding airfoil shaping for optimal efficiency, but this aspect of glider design is only a tiny factor compared to getting down to minimum weight and having proper wood density and stiffness of components, and proper trim and launch, leading to a perfect transition from climb to glide.įor high ceiling gliders (maybe over 50 ft.) airfoil shaping is a little more important. For a wing with a 3” chord at wing center, this would mean that the high point would 0.9” from the leading edge at the wing center. The typical airfoil high point would b about 30% of the wing chord (wing width). It still is not a bad idea to sand the forward portion of a flapper or a 1/16” thick sheet wing non flapper into a reasonable airfoil shape. And the flapper designs get the most important part of their airfoil shape from the curved flap. Most of the glider designs for this event will use very thin sheet for the wing, which won’t require a very sophisticated airfoil.
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