What a great web!!! Alot of opinions. I think a Q-42 or 50 will have more than enough power to fly a Nosen P-51 as they build light(even with extra weight of drive) Original plans show a Du-Bro prop drive with a .60 engine.(I have one of those also). Would be great also to find a modern prop which could transfer more torque like full size props can. Anyone like to try?