In article
,
Wright1902glider wrote:

On Aug 4, 11:05*pm, 4p1e wrote:
On Aug 1, 7:59*am, Stealth Pilot
wrote:

admittedly it is an FA18 but it still comfirms classic lift theory

Amen! I say to thee, a wing does NOT fly by pushing air down. Rather,
it creates a difference in airspeed between the air on top of the wing
and the air underneath it (relative to gravity or G-forces) which
creates the difference in air pressure which causes what we call
"lift". On hot humid days, reducing air pressure enough can cause
condensation to form. Some people say it even causes clouds.

Now before you flame me, remember that I did not say that a wing does
not deflect some air downward (assuming down is the side toward the
gravity). Only that thats not the primary source of "lift". Which of
course has been known to science since two guys stuck a fan in the end
of a box and blew around a bunch of old hacksaw blades.

Harry Frey

Actually, both models describe the same phenomenon. The Bernoulli
principle explains the detailed mechanics of lift, while the momentum
exchange model explains the end product physics of lift. After all, a
symmetric airfoil generates lift by angle of attack, as does the "flat
plate" airfoil, with zero camber.

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