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 2820 series motors have a 5mm shaft for extra strength, as well as oversize ball bearings to support the shaft and provide a long life. The internal bearing measures 11mm x 5mm x 5mm and the outer bearing measures a massive 16mm x 5mm x 5mm! 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 3.5mm bullet connectors already installed.
Included with every Cobra 2820 Series Motor is a complete accessory package which contains the following items:
Heavy Duty 3mm Thick Cross Style Motor Mount
Four M3x6mm Motor Mount Screws
Bolt-On style threaded prop adapter with 4 screws
Retaining Collar with Set Screw
Three female 3.5mm bullet connectors
Three pieces of heat-shrink tubing
Cobra 2820/14 Motor Specifications
Stator Diameter: 28.0 mm (1.102 in)
Stator Thickness: 20.0 mm (0.787 in)
Number of Stator Slots: 12
Number of Magnet Poles: 14
Motor Wind: 14 Turn Delta
Motor Kv Value: 840 RPM per Volt
No Load Current (Io): 1.00 Amps @ 10 Volts
Motor Resistance (Rm) per Phase: 0.071 Ohms
Motor Resistance (Rm) Phase to Phase: 0.047 Ohms
Maximum Continuous Current: 36 Amps
Max Continuous Power (3-cell Li-Po): 400 Watts
Max Continuous Power (4-cell Li-Po): 530 Watts
Motor Weight: 140 grams (4.94 oz.)
Outside Diameter: 35.0 mm (1.378 in.)
Shaft Diameter: 5.00 mm (0.197 in.)
Motor Body Length: 40.0 mm (1.575 in.)
Overall Shaft Length: 60.0 mm (2.362 in.)
Motor Timing: 5-10 degrees
PWM Frequency: 8 KHz
