ORIGINAL: sensei
Guys this is not rocket science, unless you are using a semi symmetrical airfoil then a positive AOA is required to produce lift and that is certainly no front page news.
Bob
Ok, I don't understand this comment (that is not to say its wrong, but please explain). It seems to me, that a wing with a SYMMETRICAL airfoil would produce no lift w/o a postive AOA. But a semi-semmetrical, or a flat-bottom wing does produce lift, even with a zero-degree AOA. All of the afore mentioned airfoils increase lift with a + AOA, but I am not understanding how it would be "required" to have a positive AOA to achieve lift?
~Dave