This is the Great Planes ElectriFly RimFire 28-26-1000 Brushless Outrunner Electric Motor. FEATURES: For Sport airplanes up to 21oz (595g) and 3D airplanes up to 13oz (370g) Designed for explosive acceleration and maximum torque Lightened aluminum can houses high torque rare earth Neodymium magnets Double shielded bearings Virtually maintenance-free; no commutators or brushes to wear out INCLUDES: Great Planes ElectriFly RimFire 28-26-1000 Brushless Outrunner Electric Motor with motor mount, leads, 2mm male connectors, and prop adapter REQUIRES: Speed control for Brushless Motors such as the ElectriFly Silver Series 12 (GPMM1810) *GPMM3122 3.5mm ML/2mm FEM BLT ADPT* SEE COMMENTS SPECS: Can Diameter: 28mm Can Length: 26mm Shaft Diameter: 3mm RPM/V (Kv Rating): 1000 Weight: 1.4oz (41g) Input Voltage: 7.4-11.1V (2-3S LiPo) Max. Constant Current: 12A Max Surge Current: 15A Max Constant Watts: 135W Burst Watts: 165W No Load Current: .7A Suggested Prop Sizes: 9x4.5 - 10x4.5 slow flyer COMMENTS: The three-number designation refers to Motor Diameter, Motor Length and kV Rating. If using the SS25 ESC(GPMM1820), the GPMM3122 3.5mm ML/2mm FEM BLT ADPT is required jxs 4/20/06 ir/jxs