Z-Power Z50A Equivalent		Century 600 Series 600A Plus 800 Kv (rpm/V) 800 Max Power (W) 2500W Max Amp (15sec) 75A Max Efficiency 90% Io (No load A) -A Rm (Resistance) -Ohm Shaft Diameter 5mm Gearbox N/A Motor Diameter 49mm Motor Length 60mm Motor Weight 340g Built in Fan Yes Max Rpm 29,000 Poles 8 Case Outrunner ESC Timing 5-10deg ESC Switching Freq. 11-13KHz