Motor Specifications Rotational Speed: 1421 RPM/V Continuous Current: 15A Max. Current: 25A Input Voltage: 6 - 18V Max. Efficiency: 98% No Load Current: 0.6A Internal Resistance: 58m ohm Motor Dimensions (Diameter x Length): 28mm x 20.6mm Shaft Diameter: 2.97mm (Front and Back) Shaft Length: 12.6mm (Front) 11.5mm (Back) Input Battery Types: NiCd/ Nimh/ Li-po Battery Recommend Model: Airplane ESC Specifications Dimensions: 51mm x 24mm x 8.3mm Sustaining Input Voltage: 6 - 18V BEC Output Current: 5V/3A Continuous Output Current: 30A Max. Output Current: 40A/12s Internal Resistance: 0.0021m ohm Cable Type: 16 AWG (Battery & Motor) Cable Length: 72mm (Battery), 72mm (Motor), 190mm (Receiver) Input Battery Types: NiCd/ Nimh/ Li-po Battery Recommend Model: Helicopter / Airplane ESC Features Auto set Low-Voltage Cutoff function Low resistence High rate PWM User programmable brake Low voltage auto setting based on battery Throttle range self-adjusting Soft start ramp up Runs motor in forward or reverse Auto motor cutoff with reset Safe power arming program ensures motor will not run accidentally after turn on Low torque start Auto shut down when signal is lost Package Included 1 x 1421 Outrunner Burshless Motor (with accessories & English Manual) 1 x RC Smart 30A Brushless ESC (with accessories & English Manual)