Here's another one that I missed on my first airplane that the instructions seem to never touch on during construction (or assembly) of trainers: Lateral balance. The instructions almost always include a section on how to locate the center of gravity (CG) and how to balance the plane in it's pitch axis BUT it needs to be balanced in it's roll axis (side to side) also. With the plane sitting level, lift it by the engine (or spinner) and the bottom of the fuselage at the tail. If one wing drops when you lift the aircraft, it means that side is heavy and you need to attach a weight to the lighter side of the wing. Make sure you find the CG and laterally balance the airplane after the model is completed. If you have done everything right the airplane should fly and track through the air very well. PAUL