I have a new GP P-51 Mustang, OS .25 engine. Haven't flow this yet. Do these engines Idle ok inverted. Or do you turn the plane upside down, so the engine is right side up then start it. Turn right side up and fly full throttle till out of gas. I've put a rudder in mine and would like to do some Hamer Heads etc. where idling the engine is desired. Don't want the throttle to be just a kill switch.

Thanks

Art