Generally, the number of TURNS that a motor has will dictate its RPM (or power). Lower turn motors (15t-6t), will run faster than higher turn motors ( 27t-16t ). The number of WINDS will determine the potential torque of a motor. A 13turn, 2 wind motor will out accelerate a 13turn, 4 wind motor, but the 13x4 will go faster since the higher number if winds will generate more RPMs at a given voltage ( generally 7.2 volt). Just remember that TURNS refers to the number of times that the wire loops around the armeture in the motor. WINDS refers to the number of wires used in a turn ( generally 1-4 wires). The more wires, a more intense electrical field is, thus more RPM's.