I Have the Evolution trainer system on a Four Star 40. I took off the flywheel and put an APC 11x7 prop on it. It runs very well. There is plenty of power for verticals. It moves that SIG around pretty fast. I liked the engine so much I bought another Evolution .46NT this time around.

I have had OS, Magnums and now the Evolution engines I think they are good. I also thinking about their .52 for a forty size Ugly Stick
I have.

Good luck
Frank