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Old January 9th 06, 04:48 PM posted to rec.aviation.soaring
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Default Thrusting or Sucking (where's Howard Stern when we need him.)

You`re pushing air, water or whatever downwards. The result is a
pressure and shear distribution on a plane which creates both lift and
drag.
In reality you can only apply bernoulli on a slow (200 kts), airfoil
shaped device because of compressibility and possible detatchment of
the boundary layer. When you start adding slats, fowler flaps or start
flying fast or very slowly (model airplane`s) Bernoulli is far beside
the thruth.

A propellor or rotor is simply a rotating wing, and works exactly the
same. It both sucks and pushes the air afterwards.

The Blackbird would probally not fly at all if you use Bernoulli.

That`s it...

Jarno Nieuwenhuize,
The Netherlands.