Tmbstory
It was was the reduction gearbox that caused all the grief. Took many hours of training to to make pilots understand how it all worked.Combined with supercharging made one hell of a confusion when you had no experience in anything mechanical. You pretty much had to be a mechanical engineer to fly a Queenair or prepaired to foot an expensive repair bill at every 100 hours.
Pilot training was the key but once you got it it was your best friend.