On Oct 5, 6:27 pm, Mxsmanic wrote:

The angle of attack is the angle between the forward stagnation point and the
trailing stagnation point. The points of intersection of the chord line with
the airfoil surface are static, but the stagnation points can change, altering
the angle of attack.

This has never been an accepted definition of angle of attack and
your creation of it has no credibility. You just create even more
confusion in your mind and in the minds of innocent truth-seekers
here.

If the angle of attack is not positive, there is no lift. You cannot have
lift at negative angles of attack because that is not symmetric.

So you don't believe NASA or NACA or anyone else that finds
lift at negative AOAs on some airfoils?

Dan