I did 3 test flights of my new Zen 50 today. I could not get over how well built that kit is. Everything goes together perfectly, and the construction/covering is better than I could do. On the first flight, I needed a little right trim on the aileron, and maybe a click or two of elevator. Otherwise she flew great and landed even better. The problem came when I started looping. Inside loops rolled a little to the left, but manageable. Outside loops rolled hard right, and it took a couple attempts to figure out how much left aileron I had to hold to keep the plane on track. According to my radio manual, if a plane rolls in different directions for the inside and outside loop, than one side of the elevator is moving more than the other. However, on the table, even with resistance from me, the two halves move exactly the same and are rock solid. My brother thinks he remembers reading that the rudder trim could be off (balanced out by the aileron), and that it shows up in the loops if it is. The wing is very stiff to stress and appears perfectly built. Any ideas?

Thanks,
Rick