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 alternative to inrunner brushless motors Quiet, lightweight operation High-quality construction with ball bearings and hardened 5mm steel shaft