Next time that you drive past a wind mill that either pumps water or generates power, stop, get out and observe.
As the wind increases speed does the mill spin faster or alternatively does its tail swing the mill out of wind to govern the speed? and do you think that there would be more or less reactionary force against the tower with more or less wind?
When you fly a kite does it fly straight up in a light or strong wind or sag limply on the end of the line, either way?
Knowing the wind speed and direction at all times, even when you are sound asleep is a really good idea if you want to survive in a helicopter for long.
Minimum sink rate is GOD. angle of glide may even be backwards in a very strong wind, who bloodycares.
I always believe that the lighter the wind, and thus the further one goes forward, that it is just like a cow walking out to pasture. It takes more power to walk further, think about it.
There is only a certain amount or Kilojoules in a kilogram of grass. A cow loses weight when it walks too far without enough energy to sustain the habit - oh, and the body fat. think about that. A very simple computation.
What is it that powers engine off autorotation? I bet you it aint variable.
So, as you drive, or ride in a train to your school tomorrow, concentrate on the specifics. Do you have enough lunch money or will you eat less today?
cheers tet
ps, well you asked the bloody question, not me.