Gizmo,

Is a .61 engine too much for the UCD? The reason I have the .61 is it was originally in the Twist. It seemed like it was too much for the plane (firewall seemed suspect to handle it) and I was flying 1/4 - 1/2 throttle at all times. I went to a .46 and it still flies great. I want to make sure if I get a "40" plane that the structure and control surfaces can handle the stresses that a .61 might present.

Rob