Neu 1706 Heli 1706H/1.5Y Kv (rpm/V) 1225 Max Power (W) 650W Max Amp (15sec) 40A Max Efficiency 89% Io (No load A) 1.5A Rm (Resistance) 0.022Ohm Shaft Diameter 5mm Gearbox N/A Motor Diameter 43mm Motor Length 39mm Motor Weight 165g Built in Fan Yes Max Rpm 30,000 Poles 8 Case Smooth ESC Timing 5-10 deg ESC Switching Freq. 11-13KHz