I would like to ask : what kind of wheels do you use ? I use a pair of 3'' with normal rim and they deform ( because of the weight of the model), so my plane has a horrible tracking on the runway. I have order a pair of Robart scale wheels ,where the tire has a lower profile,but don't have it on hands yet. Also , i noticed that while my inside loop is O.K. , the outside loop goes to a snap-roll...Any ideas?