http://www.sikorsky.com/vgn-ext-temp...extfmt=default

We have at the airport 2 Cirrus VK30s one with the prop knocked off; its a total. It has a tubine the other has a liquid cooled Voyager. Not the plane for the average pilot; over rotation and no prop. I also know that the PT6 exhaust kills the Piaggio props. Vari-Easy like planes are a little better because the moment of the engine is closer to the cg so the prop has better ground clearance when rotation is taken into account.
I have always liked pusher planes but they have to be perfect in plane and pilot to get out the performance. A tractor plane is easer to get good performance without being good.

Piaggio stayed in business by making the Vespa scooter; their engineers are a little crazy.