ORIGINAL: freakingfast
I wonder if the prop not turning would have less braking/drag (air stalled) in a dive than a spinning prop?
With a few thousand hours in single and multi engine propeller aircraft I did not see a stopped propeller in flight unless it was feathered. I did have two props (one twin and one single) quit turning during the landing roll out. however, someone else has answered you question.
Either the stopped prop or the windmilling prop could have more drag. It depends on pitch, prop length and speed. For more info and graphs visit.
http://www.goshen.edu/physics/Propel...pellerDrag.htm