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
| Cobra 4120/16 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 | 16 Turn Delta |
| Motor Kv Value | 610 RPM per Volt |
| No Load Current (Io) | 1.51 Amps @ 14 Volts |
| Motor Resistance (Rm) per Phase | 0.036 Ohms |
| Motor Resistance (Rm) Phase to Phase | 0.024 Ohms |
| Maximum Continuous Current | 62 Amps |
| Max Continuous Power (4-cell Li-Po) | 920 Watts |
| Max Continuous Power (5-cell Li-Po) | 1150 Watts |
| Max Continuous Power (6-cell Li-Po) | 1380 Watts |
| Motor Weight | 290 grams (10.23 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 |
Items Included in Hardware Package
Cobra 41mm Motor Bearing and Mounting Detail
Cobra Motor Packaging
Package Interior