This paragraph motor uses high-speed ball bearings high flux outside the rotor. Long life small size high efficiency lowe power consumption lowe vibration noise control and stability. Suitable for electric model aircraft electric helicopter high-speed power purposes. Specification: KV: 350 Idle current @ 10.0V: 0.3A Configuration: 24N28P No. of cells(Lipo): 3-6S Stator diameter: 40mm Max. continuous current(A) 60S: 20A Stator length: 6mm Max. continuous power (W) 60S: 400W Shaft diameter: M6 Max. efficiency: >84% Internal resistance: 0.280ohms Recommend Speed controller: 25A Tested with 25A ESC: Prop Volts(V) Amps(A) Watt(W) Thrust(g) Thrust(oz) Efficiency(g/W) Efficiency(oz/W) 13*6.5(APC) 22.2 7.1 157.62 1340 47.27 8.50 0.30 13*4(APC) 22.2 6.6 146.52 1220 43.03 8.33 0.29 14*7(APC) 18.5 7.8 144.3 1300 45.86 9.01 0.32 14*7(APC) 22.2 10.0 222 1800 63.49 8.11 0.29