lol trying to tell me a propeller and a rotor will behave the same?A free-driving rotating wing, be it a propeller, wind turbine or helicopter rotor, uses the energy of the freestream air passing its airfoils to get its drive, but due to the fact that there are three distinct regions across the span of the blade from root to tip (stalled, driving and driven), you will still have net drag (from the stalled and driven regions) as a function of the entire system being driven by said airflow. I assume this is what you were trying to verbalize? See this chart:
View attachment 99898
I've done plenty of autorotations over the years. If you lose RPM during the maneuver, you are screwed and will drop like a rock (eg "low drag scenario") unless you can get the RPM back up (higher drag, lower rate of decent, relatively speaking). Of course, you can really drive Nr way up above prescribed limits, but then you risk rotor hub failure...but we are not talking about that here.
My time flying the V-22 Osprey was a good example. You can be hauling tail at 220 knots, and when you pull power back and advance Nr to covert back to VTOL mode, the flat pitching as a result of the proprotor acceleration feels like deploying a parachute out of the back of the bird!
Read my previous reply to your traffic with the two helicopter examples. A free drive prop is simply being driven by the passing wind, and still creates drag. More than if the prop was not moving at all. Simulations and actual use prove the theory, its purely aerodynamic.
In point a fully feathered prop would NOT be the same as a fully feathered rotor.
I think the situation between an auto rotating helicopter or Gyro And a stalled or feathered or freewheeling propeller is different.
Let me ask you this why do you think A stopped propeller would start to rotate when the brake is released?
Are you forgetting that a stopped propeller is still being driven?
On the old airliners Where the propellers designed to feather or to brake ?