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Edge 540 · 06-04-2007, 06:07 PM

Yep, the symmetrical airfoils-rotor blades etc produce no lift an zero AOA.
Get a heli, put collective at 0 and you can spin those blades as fast as you want and you still aren't going anywhere. The lift curve for symmetrical airfoils looks like and X^3 graph. (symmetric about the origin)

Most under cambered airfoils on the other hand actually produce lift for at least several degrees negative AOA.

06-04-2007, 06:07 PM	#17 (permalink)
Edge 540 Bad-ass Super Contributer! Join Date: Jan 2006 Location: Dayton Ohio Posts: 1,682	Re: Rudder Airfoil Debate.... Yep, the symmetrical airfoils-rotor blades etc produce no lift an zero AOA. Get a heli, put collective at 0 and you can spin those blades as fast as you want and you still aren't going anywhere. The lift curve for symmetrical airfoils looks like and X^3 graph. (symmetric about the origin) Most under cambered airfoils on the other hand actually produce lift for at least several degrees negative AOA. __________________ www.ohiomodelplanes.com http://www.flyinggiants.com/gallery/...500&ppuser=273 Last edited by Edge 540; 06-04-2007 at 06:12 PM.