I flew one for years on a Magnum 40. (kit Built)
Mine balanced with no weight added, the batteries were located under the fuel tank and the servo's were as far forward as possible. You could put this plane into a slight breeze at 1/4 throttle and it would almost hover there. I can't see flying this plane with anything over a .46
I sold the plane to a buddy and taught him how to fly on it and he finally destroyed the plane after a couple of years and throwing it around like a sport plane.
Anthony