Dan Luke wrote:
"Le Chaud Lapin" wrote:

Obviously, any air above the wing can only result in a force downward
on top of the wing. The only force causing the plane to want to move
upward comes from beneath the wing. The effect of any air above the
wing is to cause rarefication above the wing, resulting in lower
pressure, thereby giving the 14.7lbs/in^2 (plus) to do its work. That
"reaction" coming from downward movement of air seems just plain silly
to me.


Then why does the wing stall and cease lifting when flow separates from the
upper surface?



It doesn't cease lifting. It doesn't lift as hard, and not hard enough
to support the airplane, but the force doesn't magically go away.

Matt