Jim Wilson writes:
> > > 
> > 
> > Well as a physicist (but with no formal aeronautical education), I always
> think of it as the wing is pushing air down, which causes an "equal and
> opposite force" (to quote Newton) of the air pushing the wing up. Hence
> acrobatic aircraft with symmettrical wings can still fly. The key to wing
> shape design is to keep the air flow attached to both the upper and lower
> surface so that you can change the direction of airflow. Once the flow
> detaches (a stall), you are not pushing the air down any more, so it isn't
> pushing you up.
> > 
> 
> This suggests that both bernoulli and the pushing (gravity) are at play,
> depending on the airfoil.  My (uneducated) guess is the pushing is almost all
> of it and that the bernoulli effect only augments:
> http://observe.arc.nasa.gov/nasa/exhibits/planes/planes_1c.html

This is a 100 year old argument :-)
http://hyperphysics.phy-astr.gsu.edu/hbase/fluids/airfoil.html

If you really want to know read everything you can wriiten by
Koukowskii and Prandtl

Cheers

Norman

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