Just a small change in balance point can make the difference between a solid performer and an airplane you have to fight just to get back down in one piece. Even if you only fly pre-built ARF models, do not overlook this critical step. Together with the differences in engine and radio selection, your new model may be far out of balance and needs to be checked. Wrong center of gravity (Especially Tail Heavy), will turn your model from an eagle into a turkey. Designed for all types of airplanes between 2-20 lbs. (910-9080g).