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The salient point of interest to me in the NACA report is found in the conclusion section at the end: " 4. The drag of a free-wheeling propeller is slightly less than that of a locked propeller in the normal range of blade angle settings."

THANK YOU for this reference! For nearly two decades I've been told that the clutched, free-wheeling prop on a gyrocopter produces far more drag - thus significantly reducing engine-out glide distance - than one that is not clutched and fixed in position in the event of an engine-out, dead...