We know that a propeller has twist from it's root to it's tip. We also know that the most thrust/drag comes out towards the tips, where the velocity is highest. The twist may be somewhere around 30 degrees from root to tip. In practice, there is very little difference between 60 and 90 degrees as far as drag is concerned. I would think limiting angles of 30/tip, 60/root would be typical (60/90 feather position). At full throttle, you'd never see any of the #2 drag until you hit well over 500 mph, but at idle, the drag would become prominent above about 200 mph. So basically, the RPM setting will determine the speed at which the propeller starts to act like a barn door!
[This message has been edited by wells (edited 05-31-2000).]