Even if pitch is adjustable the problem is very non-trivial given the size of the blades and different wind speeds and directions on different elevations. Putti

Even if pitch is adjustable the problem is very non-trivial given the size of the blades and different wind speeds and directions on different elevations. Putting the blades in no-power position along the main wind direction, but having small sidewind 200m above the surface would rotate it.