Cobra CM-4012/30 Multirotor Motor, Kv=300

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Cobra CM-4012/30 Brushless Multirotor Motor

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Cobra Brushless Multirotor Motors offer performance and value for Your RC Models. 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 sides, with separate compartments to protect the motor and accessory pack.

The Cobra CM-4012 series motors have a 4.0mm motor shaft for extra strength, as well as oversize ball bearings to support the shaft and provide a long life. The stators are made with 0.20mm laminations for maximum efficiency and minimum Eddy Current losses. Since these motors are typically soldered directly to the speed controller for reliability, and often need to be cut to length for the specific installation, the CM-4012 motors come without bullet connectors and feature extended pre-tinned motor leads that are 17 inches (430mm) long. These motors also have 3mm threaded holes in a 19x25mm pattern on the back plate for easy installation on your model.

The CM-4012 series motors allow for multiple propeller mounting options. They have a set of four of 3mm threaded holes located on a 12mm circle for directly mounting carbon fiber props that use two 12mm spaced holes, or to mount the included bolt-on style prop adapter. This prop adapter has an M6x1.0mm thread for holding traditional multirotor props that have a 6mm center hole. The included prop washer and nylon insert prop nut provides a solid attachment for your propellers that will not loosen up and slip during use.

Included with every Cobra CM-4012 Series Motor is a complete accessory package which contains the following items:

● Two M3x10mm Prop Mounting Screws
● Four M3x8mm Prop Adapter Mounting Screws
● Machined Aluminum Bolt-on Style Prop Adapter
● Machined Aluminum Prop Washer
● Locking Prop Nut with Nylon Insert
● Machined Aluminum Top Plate for Carbon Fiber Props

Click here for the Cobra CM-4012/30 Propeller Data Chart

Cobra CM-4012/30 Motor Specifications
 Stator Diameter 40.0 mm (1.574 in)
 Stator Thickness 12.0 mm (0.472 in)
 Number of Stator Slots 24
 Number of Magnet Poles 22
 Motor Wind 30 Turn Wye
 Motor Kv Value 300 RPM per Volt
 No Load Current (Io) 0.69 Amps @ 21 Volts
 Motor Resistance (Rm) per Phase 0.062 Ohms
 Motor Resistance (Rm) Phase to Phase 0.124 Ohms
 Maximum Continuous Current 22 Amps
 Max Continuous Power (5-cell Li-Po) 410 Watts
 Max Continuous Power (6-cell Li-Po) 4900 Watts
 Motor Weight 140 grams (4.94 oz.)
 Outside Diameter 45.5 mm (1.791 in.)
 Motor Shaft Diameter 4.00 mm (0.157 in.)
 Prop Shaft Diameter 6.00 mm (0.236 in.)
 Motor Body Length 27.9 mm (1.098 in.)
 Overall Shaft Length 33.5 mm (1.319 in.)
 Motor Timing 5-10 degrees
 PWM Frequency 8 KHz to 20Khz

Motor Performance Graphs

The following downloadable PDF files show the performance data curves of the Cobra CM-4012/30 motor, over its entire throttle range, with a variety of propellers. These graphs can be downloaded and printed to use as a reference for calculating power requirements at specific thrust levels, and enable the user to calculate flight times, current draw and other motor parameters.

5-Cell Li-Po Power

Cobra CM-4012/30 Performance Data with APC 18x5.5-MR prop on 5S Li-Po

Cobra CM-4012/30 Performance Data with GemFan 20x6-MRW prop on 5S Li-Po

Cobra CM-4012/30 Performance Data with RC-Timer 17x5.5-CF prop on 5S Li-Po

6-Cell Li-Po Power

Cobra CM-4012/30 Performance Data with APC 16x5.5-MR prop on 6S Li-Po

Cobra CM-4012/30 Performance Data with GemFan 18x5-MRW prop on 6S Li-Po

Cobra CM-4012/30 Performance Data with RC-Timer 15x5.5-CF prop on 6S Li-Po

Performance Graph Instructions

This downloadable PDF file shows the step by step process to use for interpreting the data shown in the Motor Performance Graphs. By following this procedure, you can determine how to select a proper motor for a Multirotor aircraft, as well as calculate required power levels, determine overall prop efficiency and calculate expected flight times based on the battery size that is used. This document can be printed out and saved as a valuable reference tool to keep in your workshop for future use as well.

Motor Performance Graph Instructions

Top View

Items Included in Hardware Package

NOTE: Cross Mounts are NOT included with any multirotor motors.

For more information about this product and the rest of the Cobra Motors product line, please check out the Cobra Brushless Motors web site.
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