Yeah, that's what the salesman was telling me. I'm wondering what the shaft size would have to be to handle 65-100hp? Mini-imps just use a regular off the shelf drive shaft of the appropriate length AFAIK. I'm just curious as to how that would work as a practical solution to a pusher with a shaft driven prop of normal size for the application.100 hp helicopter will use 10-15 to turn the tail rotor. That is what the driveshaft is sized for.