This is the Great Planes ElectriFly Ammo / 28-45-3600kV Brushless In-Runner Electric Motor. / / FEATURES: Brushless, slotless Ammo In-Runner Motors offer an incredible power- / to-weight advantage and almost twice the efficiency of Brushed / motors / Ideal for direct or gear drive use / Up to 89% efficient and virtually maintenance-free; no brushes to / wear out / Powered by "rare earth" Neodymium magnets for high torque and / unmatched heat resistance / Pre-installed gold plated connectors for plug and play operation / when used with compatible ElectriFly Silver Series Brushless speed / controls / Double sealed bearings / Two year warranty / / INCLUDES: Great Planes ElectriFly Ammo 28-45-3600kV Brushless Electric Motor / with connectors and four M3x5 machine screws / / REQUIRES: Installing in model and connecting to speed control / Propeller, suggested sizes are 9x6E-15x10E / / SPECS: Motor Diameter: 1.1" (28mm) / Motor Length: 1.77" (45mm) / Shaft Diameter: .126" (3.2mm) / Shaft Length: .591" (15mm) / kV Rating: 3600 rpm/V / Weight: 4.6oz (133g) / Input Voltage: 7.4-14.8V / Max. Constant Current: 40A / Max. Surge Current: 70A / Max. Constant Watts: 592W / No Load Current: 2.3A / / jxs 2/23/06