Reduce rpm in the F4U and it'll glide rather well, actually. I'll post a glide video in the film thread.
All his point is, is the glide path is different between:
High RPM windmilling
Low RPM windmilling
Stopped prop
In order of most to least drag. I don't know what the proper speeds are, I don't know if what's in the game is right or wrong, but it would be neat if it reflected reality I suppose.
High alt bomber hunting, I do a ton of dead sticking home. If it's as big of a difference between windmilling and not windmillling as icepac claims, it's worth stopping the prop in some situations.
Wiley.