a generic text that prop strike = engine rebuild
Yeah, that is the case with the majority of prop driven aircraft, and includes alot of Turboprops too, like the Allison used on alot of aircraft, and it is a guarantee with any pistion engine. Big issue is crankshaft on piston.
But the Pratt and Whitney PT6 on the King Air uses the Free Turbine I mentioned. You can actually hold the prop still while the engine is started. I don't know at what point the forces would be too great, but I expect it would eventually be too much to hold.
If you are around a Turboprop with PT6, when they start they often leave the prop in a pitch I believe to be at or near feather, then, they prop is turning much slower and quieter than normal, and you can easily hear the differance when the pilot brings the prop out of that range and into normal pitch.
dago