Aerodynamic question

[FLS]

Ever see one of these fall out of a tree?
If it doesn't spin, it falls fast. (no drag)  When it spins if falls slowly. (drag)

Coogan

There is drag in either case. When it spins it creates lift.

[icepac]

I think a real life P51 will dive faster at 30,000 feet with the prop. feathered than under power but the reverse is true at lower altitudes.

It would have to fully feather.

The reno guys run as coase a pitch as you can run and the props are good to only a few mph over 500 with 4000hp.

[Slade]

Ever see one of these fall out of a tree?

Thanks for explaining it in a way that the flight math aerodynamics inhibited like me can understand.