Power 25 Brushless Outrunner 1250KvKey Features Ideal for airplanes requiring up to 850 watts of input power Equivalent to a 25 size glow engine for high power airplanes weighing 3 to 5. 5 pounds (1. 4 to 2. 5 kilograms) or 15 sized high speed electric Formula One racers weighing up to 4 pounds (1. 8 kilograms) Includes mount, prop adapter and mounting hardware External rotor design; the shaft can easily be reversed for alternative motor installations High torque, direct drive