The A40-10L Electric Turbine is specifically for Extreme 3D Helicopters. This motor combines a high-efficient motor design with almost unbelievable power and improved cooling. It is an 8 Pole Inside-Outrunner design Featuring: 8-Pole High-Temp Neo Magnets, low resistance windings, special Heli-Stator, Fan cooling, High RPM Bearings, and precision ground and hardened output shaft.