This is the Great Planes ElectriFly RimFire .32 42-50-800 Brushless Outrunner Electric Motor. FEATURES: For Sport airplanes up to 6.5lbs (2950g) and 3D airplanes up to 4lbs (1845g) Designed for explosive acceleration and maximum torque eliminating the need for a gearbox Lightened aluminum can houses high torque rare earth Neodymium magnets Double shielded bearings Virtually maintenance-free; no commutators or brushes to wear out Two year quality guarantee INCLUDES: Great Planes ElectriFly RimFire .32 42-50-800 Brushless Outrunner Electric Motor Outrunner Motor Mount GPMG1205 Outrunner Prop Adapter GPMQ4906 REQUIRES: Brushless Motor-compatible 45 amp Electronic Speed Control Propeller: 12x6 - 13x8 electric SPECS: Motor Diameter: 1.7" (42mm) Motor Length: 2.0" (50mm) Shaft Diameter: .20" (5mm) Shaft Length: .67" (17mm) Lead Length: 3" (76mm) Connectors: Bullet type, 4.0mm diameter Max. Constant Current: 50A Max. Surge Current: 80A Max. Constant Watts: 925W Max. Burst Watts: 1480W No Load Current: 2.6A Input Voltage: 11.1-14.8V (3-4S LiPo) RPM/V (kV Rating): 800 Weight: 7oz (198g) COMMENTS: The three-number designation refers to Motor Diameter, Motor Length and kV Rating. jxs 4/20/06 ir/jxs