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Old August 6th 09, 05:36 PM posted to rec.aviation.homebuilt
Jim Logajan
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Posts: 1,958
Default visualisation of the lift distribution over a wing

Wright1902glider wrote:
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".


Well then, you'd better contact NASA and tell them they need to correct the
following:

"Lift occurs when a moving flow of gas is turned by a solid object. The
flow is turned in one direction, and the lift is generated in the opposite
direction, according to Newton's Third Law of action and reaction."

Quoted from:
http://www.grc.nasa.gov/WWW/K-12/airplane/lift1.html

"Lift is created by deflecting a flow of air,"

Quoted from:
http://www.grc.nasa.gov/WWW/K-12/airplane/momntm.html

On hot humid days, reducing air pressure enough can cause
condensation to form. Some people say it even causes clouds.


Inserting the word "adiabatically" right after the word "pressure" make the
above a more reasonable assertion.

Now before you flame me,


Too late! :-)

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.


Different physical situations. Incorrect analogy.