Quote:
Originally Posted by aerohead
4) at wind speed, there is no net force acting anywhere on the vehicle, it's at terminal velocity.
6) for the blades to be producing net thrust requires over-unity, which is impossible given the already stated mechanical efficiencies between blades and wheels.
|
at wind speed, the wings on the propeller are still moving, and like the sail on a tacking boat, still providing thrust.
It doesn't require over-unity, because essentially the energy is coming from the difference between air speed and ground speed.