Lose one engine on takeoff and find, perhaps, that your 65 year-old prop feathering system has pooped out,
Propellers have maximum times that require them to be overhauled and re-certified.
I have flown these engines and propellers on the DC3 and PBY for around 10,000 hours and never had one fail mechanically....had a few prop governors and feathering motors fail but the airplanes were still controllable and flyable.
By the way an engine failure on take off is not an automatic crash, I have had it happen twice on these types of airplanes and managed to control the things to a safe landing.