Neu 1515 Heli 1515H/2Y F 1515H/2.5D F Kv (rpm/V) 1100 1700 Max Power (W) 1500-2500W 1500-2500W Max Amp (15sec) 70A 85A Max Efficiency 90% 90% Io (No load A) 1.1A 2.25A Rm (Resistance) 0.019Ohm 0.010Ohm Shaft Diameter 5mm 5mm Gearbox No No Motor Diameter 49mm 49mm Motor Length 82mm 82mm Motor Weight 395g 395g Built in Fan Yes Yes Max Rpm 60,000 60,000 Poles 4 4 Case Finned Finned ESC Timing 5-10 deg 5-10 deg ESC Switching Freq. 11-13KHz 11-13KHz