I just test flew this airplane yesterday for another club member. His had the Magnum 80 4 stroke.

It's a very good combination. The 91 would give you a little more power.

I think you will like the combination of plane and motor.

4 strokes have more shake than 2 strokes. Make sure every thing is tight, and pin the firewall.

Your take off roll should be some where in the naborhood of 10 feet. The landing is slow.

A good airplane all around.

Tony