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OCDAY BL3650 3900KV Sensorless Brushless Motor CNC 4 Poles for RC 1/10 Car Description; High purity copper windings maximizes efficiency. CNC machined 6061 T4 billet aluminum heatsink can. Precision engineered for maximum energy conversion. Precision balanced rotor, smoothness for best reliability and maximum RPM. 4 poles design, high torque and high efficiency. Shorter stator, less wire, lower resistance, more power. Specification: Model: BL3650 Material: aluminum alloy Size(D*H): 36 x 64mm/1.4 x 2.5 inch Shaft Length: 15mm Shaft Diameter: 3.175mm Connector: 4mm banana connector KV(RPM/Volt): 3900KV Net weight: 180g Max RPM: 50000 Max current: 69A Max watts: 900W Max Current: 56A Max voltage: