I completed one of these for my father-in-law. He wanted a K&B Screamin 48 in it. I balanced it at 4.5" from the leading edge and flew it on its maiden flight. I set up the control surfaces on the mild side and the plane flew really well. It could fly fast or slow, tracked well, took off and landed well and was all around a great flying plane. As for a 60 on this plane, you may have some problems balancing it, but it should give you great 3D capability. As mentioned above, you will increase wing loading, but it should not be that bad. By the way, the 48 on my father-in-law's plane is one of the heaviest in its class, so if you find a light 60, I bet it will be pretty close.