Cobra C-4120/12 Brushless Motor, Kv=850

Quantity: 1

Cobra Brushless Motors offer performance and value for Sport Flyers and Competition pilots alike. They are built from high quality components, and are designed to give years of top-level performance. All Cobra Motors are shipped in a custom designed package that features protective foam on all six sides of the box, with 3 separate compartments to protect the motor, accessory pack and cross mount.

The Cobra 4120 series motors have a 6.0mm shaft for extra strength, as well as oversize ball bearings to support the shaft and provide a long life. There are two internal bearing measure 12mm x 6mm x 4mm and the outer bearing measures a massive 17mm x 6mm x 6mm! The stators are made with 0.20mm laminations for maximum efficiency and minimum Eddy Current losses. Also included on the motor are ultra-flexible motor leads with high-temp silicone rubber insulation and 4.0mm bullet connectors already installed.

Included with every Cobra 4120 Series Motor is a complete accessory package which contains the following items:

● Heavy Duty 3mm Thick Cross Style Motor Mount
● Four M4x8mm Motor Mount Screws
● Bolt-On style threaded prop adapter with 8mm shaft and M8x1.0mm thread
● 3 Prop Adapter retaining screws
● Retaining Collar with Set Screw
● Three female 4.0mm bullet connectors
● Three pieces of heat-shrink tubing


Click here for the Cobra C-4120/12 Propeller Data Chart


 
Cobra 4120/12 Motor Specifications
 Stator Diameter  41.0 mm (1.614 in)
 Stator Thickness  20.0 mm (0.787 in)
 Number of Stator Slots  12
 Number of Magnet Poles  14
 Motor Wind  12 Turn Delta
 Motor Kv Value  850 RPM per Volt
 No Load Current (Io)  2.74 Amps @ 14 Volts
 Motor Resistance (Rm) per Phase  0.021 Ohms
 Motor Resistance (Rm) Phase to Phase  0.014 Ohms
 Maximum Continuous Current  75 Amps
 Max Continuous Power (3-cell Li-Po)  830 Watts
 Max Continuous Power (4-cell Li-Po)  1110 Watts
 Max Continuous Power (5-cell Li-Po)  1390 Watts
 Motor Weight  293 grams (10.34 oz.)
 Outside Diameter  49.8 mm (1.961 in.)
 Shaft Diameter  6.00 mm (0.236 in.)
 Motor Body Length  51.8 mm (2.039 in.)
 Overall Shaft Length  74.5 mm (2.933 in.)
 Motor Timing  5-10 degrees
 PWM Frequency  8 KHz
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