Quote:
Originally Posted by nosehair  The air striking the lower surface is pushing it up into the lowered air pressue above.
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The air striking the lower surface has a negligent effect on lift...until you get into high speed high altitude flying. The dynamic pressure of the air at subsonic speeds is too puny to have any meaningful contribution on the lower surface of the wing.
At high altitudes, once the air pressure gets very, very low...and circulation theory becomes less effective on lift production...then the "skipping stone" theory comes into play. But you pretty much need to be flying an SR-71 for the relative free stream to have lifting effect below the wing.
For subsonic flight...to say that air impacting the lower surface of the wing pushes the wing up for some type of lift...is inaccurate.