Align BL Series BL500L Kv (rpm/V) 1600 Max Power (W) 800W Max Amp (15sec) 45A Max Efficiency 85% Io (No load A) Rm (Resistance) Shaft Diameter 5mm Gearbox N/A Motor Diameter 36mm Motor Length 61mm Motor Weight 200g Built in Fan Yes Max Rpm 40,000 Poles 6 Case Finned ESC Timing 5-18 deg ESC Switching Freq. 16-22KHz