RE: Propeller Worms
Barry,
I have edited my previous post...
A prop on an idling engine will obviously speed up somewhat; increasing the RPM of the engine with it.
But by no means will it spin as fast as it would when windmilling (when the plane is flying significantly faster than in 'idle flight'), or like a helicopter rotor during auto-rotation.
In fact, I have emphasized this in some past thread... If you use a prop with too low a pitch, your plane could (aerodynamically) stall on the final leg of the landing approach, as you chop the throttle; if 'idle flight' speed is lower than the model's stalling speed.