INTEGY ULTIMATE 3D OUTRUNNER FOR 450 SIZE HELI3200KV high efficiency, high torque, 4holes, multi-poles outrunner brushless motor. High-efficiency, power-saving motor, high efficiency: 92%+, CNC precision machined case, hand wound windings, operates very cool, input voltage: DC7.4~14.8v, max output efficiency: 92%, max continuous current: 28A, max output power:320W, extreme 3D capable, 2.3mm motor output shaft -