I flew my ultra stick 60 with an OS 91 FS and it flew very nicely. I wanted more power so I put a super tigre 91 2 stroke on it and wow what a blast. It had unlimited vertical and would do anything I was capable of. I liked the plane so much that I got a bigger one the Ultra stick lite 120 and am in the process of building it and putting a 3W-24 gasser on it. I should have it done this week.

Rick