Great kit, fairly easy to build, flies great, not as scale as other kits but I can't think of any other 40 size that is any more scale. I was told that the airfoil is based on the ultrasport which makes it fairly aerobatic. Mine was clocked at 90+mph with a Royal 46 using a standard muffler. The fuse will accommodate a 60 size engine but I don't think it is necessary.

George