New 5010 350KV / 750KV High Torque Brushless Motors Outrunners for ZD550 ZD850 MultiCopter / Quadcopter Achieve higher efficiency with up to 16" propellers and up to 22.2V. This is 5010 350KV / 750KV brushless motor, designed for either 14x5.5" propellers at 6-cells or 22.2V at 25amps(approx.) or larger propellers when lower voltage batteries are used. At 11.1V, larger or more efficient propellers can be used (only recommended for lighter efficiency configurations). Features: 1.Machined aluminum front housing with four fan-style cooling holes that pump air through the motor while it runs. 2.Rear threaded mounting holes with both 16 mm and 19mm hole spacings fit a variety of applications. 3.Specially designed NdFeB magnets with high temperature rating for trouble-free operation. 4.High quality stator plates are epoxy coated on the inner surface to prevent winding shorts. 0.20mm stator plate id used on this motor 5010. 5.High quality shielded and permanently lubricated ball bearings are used to support the motor shaft in all our motors. 6.High temperature adhesives are used to secure the stator windings and prevent them from shifting and getting pinched or shorting out . Specifications: Motor size: 50*10mm Shaft size: 4mm Weight: about 115g KV(rpm/v): 350 / 750 Recommended parts (Not inclueded) Battery: 2-6 Li-Po ESC: 20-40A Used on 4-axle , Best working with props of 14-16" Used on 6-axle or 8-axle, Best working with props of 12-13"