HK 2208 Series 2208-3600 Kv (rpm/V) 3590 Max Power (W) 220W Max Amp (15sec) 21A Max Efficiency 83% Io (No load A) 1.21A Rm (Resistance) 0.061Ohm Shaft Diameter 2.3mm Gearbox N/A Motor Diameter 28mm Motor Length 20.5mm Motor Weight 39g Built in Fan N/A Max Rpm 48,000 Poles 6 Case Outrunner ESC Timing 20-25 deg ESC Switching Freq. 8-16KHz