I wouldn't use the OS 61 myself. I have one and the engine is pretty blah and disappointing when it comes to power. I would use the FS 91 instead. The plane is serious fun when powered properly. I needed a bit of nose weight to balance mine. The first flight I had other flyers yelling at me because they thought I pulled the plane off the ground too fast. What they didn't realize is that this plane wants to fly and leaves the ground on its own. I was just keeping it straight down the run way when it was suddenly heading for the clouds!! Actually very trainer like except in a low wing tail dragger configuration. [X(]