Phil wrote in news:1192037923.115677.275220
@o3g2000hsb.googlegroups.com:

On Oct 9, 6:15 pm, Ray Vickson wrote:
Heh. I know the argument. I think it's broken out here (sci.physics)
many times.

(a) It's the Bernoulli effect due to the shape of the
wing cross-section, the way we were all taught as kids.

(b) No, it's just the angle of attack.

Probably true, in large part anyway. Just consider that aerobatics
pilots can fly their planes upside-down over considerable distances.
If Bernoulli were the sole factor this couldn't happen.

R.G. Vickson

It doesn't have to be either-or. Both Bernoulli and angle of attack
are at work in generating lift.


That's right, but what's more is that Bernoulli is strengthened by angle of
attack and it's that which provides most of the increase n lift at higher
angles.
Even with a flat bottom wing being flown inverted, most of the lift is
still coming from Bernoulli.



Bertie