OK... izzatafact? I'll defer to your greater knowledge... Sorry mate, I shoulda said, I'm repeating what I've read, but it probably came from some Time/Life magazine or something... I'd kill to fly anything with a Griffon or a Merlin in it! [I've named two dogs after each] But I've never put myself airborne with anything beyond an O320...
I can well imagine the torque effect of a single 1500-2000 hp monster, swingin' a full paddle wheel of prop blades, would be quite the animal to tame... One would certainly like to know which foot to have ready...