This is the Great Planes ElectriFly Ammo 24-33-4040kV 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 24-33-4040kV Brushless Electric Motor with connectors and four M3x5 machine screws REQUIRES: Installing in model and connecting to speed control Propeller, suggested sizes are 7x5E-12x8E SPECS: Motor Diameter: .945" (24mm) Motor Length: 1.3" (33mm) Shaft Diameter: .118" (3mm) Shaft Length: .472" (12mm) kV Rating: 4040 rpm/V Weight: 2.4oz (67g) Input Voltage: 7.4-11.1V Max. Constant Current: 18A Max. Surge Current: 28A Max. Constant Watts: 200W No Load Current: 1.1A jxs 2/23/06 ir/jxs