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 theaded prop adapter with 4 screws
● Retaining Collar with Set Screw
● Three female 3.5mm bullet connectors
● Three pieces of heat-shrink tubing
| Cobra 2820/8 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 | 8 Turn Delta |
| Motor Kv Value | 1450 RPM per Volt |
| No Load Current (Io) | 2.50 Amps @ 10 Volts |
| Motor Resistance (Rm) per Phase | 0.030 Ohms |
| Motor Resistance (Rm) Phase to Phase | 0.020 Ohms |
| Maximum Continuous Current | 55 Amps |
| Max Continuous Power (3-cell Li-Po) | 610 Watts |
| Max Continuous Power (4-cell Li-Po) | 810 Watts |
| Motor Weight | 139 grams (4.90 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 |