Mxsmanic wrote:
Le Chaud Lapin writes:

This true and not true. A wing does not necessarily have to push air
downward to cause lift.

Not correct. Air (or some other mass) must be accelerated downward in order
to produce the upward acceleration of lift. There is no way around this. And
so wings must accelerate air downward in order to produce lift.

When in straight and level flight, the air flow through the rotor blades
of a gyrocopter is upward.


--
Jim Pennino

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