[QUOTE=berner;14155961

If you play around with it you will find that power required for a given speed varies as the square of the speed, I believe. [/QUOTE]

Correctly stated, the wind FORCE goes up by the square of the speed. But power is different than force, power is force X the distance that it is exerted over. Very simply stated, if you use a force of 5 pounds to push an object over a distance of 10 feet you have done twice the work than if you pushed it 5 feet. The result is that power requirements go up by the cube of the speed.