Align BL Series BL250 Kv (rpm/V) 3400 Max Power (W) 170W Max Amp (15sec) 16A Max Efficiency 80% Io (No load A) - A Rm (Resistance) - Ohm Shaft Diameter 2.5mm Gearbox N/A Motor Diameter 24.8mm Motor Length 22mm Motor Weight 30g Built in Fan N/A Max Rpm 40,000 Poles 6 Case Outrunner ESC Timing 20-25 deg ESC Switching Freq. 8-16KHz