wow, I had 3 U Can Dos and I fought coupling on all 3 of them. Im not sure if the newer versions have improved rudder but the original versions had a reputation for severe coupling issues. The worst was trying to enter a knife edge loop. I think on my earlier versions it was a lack of power running an OS91 FS. On the later versions I ran a Saito 1.20 and it wasnt as bad but it was still a problem. I reasoned that it was because it had so much power that it was climbing at lower rudder throw due to increased propwash and therefore more rudder authority. With less rudder input less coupling. But it was still a substantial problem, just less than with the 91. With my Edge you just roll it on KE, give a little rudder, adjust throttle and elevator for crosswind and attitude and watch it do its thing.

Again I think experience has a lot to do with it. I can fly my foamies on KE all day long and they are HARD to get to knife edge, much harder than a UCD. I know this because several of us at the field have foamies and most cant KE them at ALL, only 3 of us can. I also fly with less expo now so it "feels" like less stick input. As I gain experience I find many things that used to seem impossible much easier now.