Neu 1105 Series 1105/2Y 1105/2.5Y 1105/3Y 1105/3.5Y Kv (rpm/V) 5000 3800 3300 3000 Max Power (W) 400W 350W 350W 350W Max Amp (15sec) 40A 25A 20A 18A Max Efficiency 87% 85% 85% 85% Io (No load A) 1.4A 0.7A 0.65A 0.45A Rm (Resistance) 0.018Ohm 0.028Ohm 0.039Ohm 0.055Ohm Shaft Diameter 3.17mm 3.17mm 3.17mm 3.17mm Gearbox N/A N/A N/A N/A Motor Diameter 29mm 29mm 29mm 29mm Motor Length 32.5mm 32.5mm 32.5mm 32.5mm Motor Weight 65g 65g 65g 65g Built in Fan N/A N/A N/A N/A Max Rpm 60,000 60,000 60,000 60,000 Poles 4 4 4 4 Case Smooth Smooth Smooth Smooth ESC Timing 5-10 deg 5-10 deg 5-10 deg 5-10 deg ESC Switching Freq. 11-13KHz 11-13KHz 11-13KHz 11-13KHz