Align BL Series BL430SP Kv (rpm/V) 3700 Max Power (W) 380W Max Amp (15sec) 40A Max Efficiency 86% Io (No load A) - Rm (Resistance) - Shaft Diameter 3.5mm Gearbox N/A Motor Diameter 27.5mm Motor Length 42mm Motor Weight 75g Built in Fan Yes Max Rpm 45,000 Poles 6 Case Smooth ESC Timing 5-18 deg ESC Switching Freq. 16-22KHz