HK 2208 Series 2208-3600 Kv (rpm/V) 3900 Max Power (W) 150W Max Amp (15sec) 15A Max Efficiency 85% Io (No load A) 0.83A Rm (Resistance) 0.064Ohm Shaft Diameter 2.5mm Gearbox N/A Motor Diameter 28mm Motor Length 22.5mm Motor Weight 32g Built in Fan N/A Max Rpm 45,000 Poles 6 Case Outrunner ESC Timing 20-25 deg ESC Switching Freq. 8-16KHz