The rigid hubs of these
2.3MW turbines were the size of a Transit van!
Notice the door at the base of the one in the foreground...
Blade camber is wrong way to allow for autorotation from rotor top. They take time to respond to wind change so get noisy until "pilot" adjusts collective. The advantage being here that a generator forces constant RRPM by varying power adsorption.
Originally Posted by outofwhack
Do any engineering types amongst us know how many degrees of pitch the blades of a helicopter typcially have when the collective is bottomed.
Depends on aerofoil lift and drag vector angle to chord. Combined lift and drag vectors have to point straight up to keep RRPM constant. Raise collective vector points backwards, RRPM decreases. Lower collective vector points forwards, RRPM increases. You need to add a pitch increase since finite rotor size causes local downwash over each blade (induced drag from tip vortices).
The practical upshot is that you are probably correct. Long time no study aero.
Mart