Mega 16/15/4 (photos below are of the Mega 16/15/3 but used for illustrative purposes) Neodymium magnets - strong magnetic field produces exceptional motor torque Kevlar sleeve on rotor allows 40,000 rpm Efficient rotor design supported by sealed ball bearings for long life Flow-through cooling for reliable operation at high power levels Exceptional versatility - from 6 to 12 cells direct, and 6 to 16 cells geared (depending on wind) Fitted with 16mm / 19mm mounting holes and  3.17mm motor shaft to fit many motor mounts and gearboxes Motor Type #Cells No Load  Amps  m W Kv Short Time Max Amps Weight ACn 16-15-4 7-16 1.10 45 2200 25 76g