After reading the many comments on this subject, I reached pout to several experts including the an of a local College Dean who heads up the Aeronautics Department and Tom Turner, of the American Bonanza Society. They all had the same answer: A stopped prop creates less drag than a windmilling...
Great discussion and appreciate the comments. My unqualified understanding is that flying fixed-wing aircraft the ultimate "best glide" rate would be to have no prop at all. Next would be a full feathering ability followed by setting prop control to full high pitch (constant speed propeller)...
Best glide with windmilling prop or stopped prop?
I recently was flying an S-35 Bonanza with an IO 550-B engine. At 4, 500 feet the engine came apart and the prop came to a very sudden stop. I immediately made a 180 turn headed to a dirt runway I was aware of. The best glide in this bird is...