Align BL Series BL650L Kv (rpm/V) 1220 Max Power (W) 2000W Max Amp (60sec) 85A Max Efficiency 85% Io (No load A) Rm (Resistance) Shaft Diameter 6mm Gearbox N/A Motor Diameter 46.5mm Motor Length 70mm Motor Weight 400g Built in Fan Yes Max Rpm 40,000 Poles 6 Case Finned ESC Timing 5-18 deg ESC Switching Freq. 16-22KHz