This is the Great Planes ElectriFly Ammo / 20-40-3500kV 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 20-40-3500kV Brushless Electric Motor / with connectors and four M2x5 machine screws / / REQUIRES: Installing in model and connecting to speed control / Propeller, suggested sizes are 10x4.5S-12x8S / / SPECS: Motor Diameter: .787" (20mm) / Motor Length: 1.57" (40mm) / Shaft Diameter: .079" (2mm) / Shaft Length: .413" (10.5mm) / kV Rating: 3500 rpm/V / Weight: 2.3oz (65g) / Input Voltage: 7.4-11.1V / Max. Constant Current: 12A / Max. Surge Current: 25A / Max. Constant Watts: 133W / No Load Current: 1A / / jxs 2/23/06