a.) Never heard of it, and
b.) I definitely don't want this feature in the game.
The Macchi info is irrelevant, in what situation do have less than 1000rpm?
On the ground or you have a stalled engine.
In the latter situation you don't need the prop anymore...
Spit: This would kill instant action on full real servers - imagine you have to fly around for 15min till you can pop your first round.
That would be so AWSOME!
No.
Well, it's not like I cared, because I never fly red, but anyway