Awhile back, I picked up a new motor from Gear Best, a large online distributor of all kinds of products from China. This motor is the Gear Best 2212/5T 2700 Kv motor that you can see pictured below in my NAMC Mig-35 testbed plane.
When I first saw the specifications on this motor, I had hoped it might be another alternative to the Focal Price/Deal Extreme/EBay motors we have listed in the "medium" motor section of our NAMC Recommended Parts list.
Thus far through the 12 test flights I have completed, I actually feel this motor would probably best fit into our "mild" section of motors on the parts list. My evaluation is based on simply what I saw at the field and comparing a few numbers I saw by evaluating motor performance with my wattmeter.
The setup I used for flight testing thus far is using a 6x3 EMP prop, Turnigy Plush 40A ESC and Zippy Flightmax 2200 Mah 3S 40C discharge battery. More details on all these components can be found on our parts list linked above.
I took readings on six separate occasions with the wattmeter and found the average of these six evaluations to be as follows -
- 50% throttle - 13.3 A/158.4 watts
- 100% throttle - 31.4 A/360.1 watts
In comparison, I also took the same readings with my Turnigy 2826/6 2200 Kv motor and 6x4 APC prop combo and saw the following results -
- 50% throttle - 14.6 A/175.6 watts
- 100% throttle - 30.4 A/351.1 watts
With the FP/DX/EBay 2212/6 2700 Kv motor with 6x3 EMP prop, I normally get very close to the following results -
- 50% throttle - 15 A/175.1 watts
- 100% throttle - 35.7 A/425.8 watts
Thus far during the flight tests this week, I have been flying these two planes to compare in-flight performance.
Low to mid range performance (50-75% throttle) is comparable between the two setups. When I hammer the throttle with the Gear Best setup, I do get slightly better acceleration than with the Turnigy setup, but once the plane reaches full speed, the two setups are quite comparable. I am assuming the better acceleration with the Gear Best setup is due to the lower pitch prop and higher Kv motor. Other than that, performance is quite similar, thus supporting my initial impression that if I had to place the Gear Best motor in any of the categories on our NAMC recommended parts list, it would be in the "mild" section based on what I have seen thus far.
I am still learning about brushless motors and what the nomenclature means. My understanding is that the number after the "/" (5 in the case of the Gear Best motor) refers to the number of windings per stator arm. All other dimensions are identical with the "mild" and "medium" motors on our list, including weight. I can only assume that even though the GB motor has the same Kv rating as the FP/DX/EBay motors, it lacks the top end performance because of the difference in windings as the "medium" motors on our list are all 2212/6 motors.
I will continue further field testing trying different props on the GB motor and when the weather turns a bit less favorable to flying will do a more thorough bench test, but as mentioned earlier, using the setup I have been using in testing, I would place this Gear Best 2212/5T 2700 Kv motor in the "mild" category of our parts list.
Here are a few things I would recommend based on what I have observed thus far if you decide to try this motor.
- be patient with the shipping :) as mentioned, it is a very inexpensive motor and shipping is free, but expect it will take a long time to get to you;
- recommend using a 40A ESC as it regularly runs over 30A at full throttle with the 6x3 EMP prop;
- I would recommend starting off with a 6x3 EMP prop, although I am sure it will spin a 6x4 prop, based on how warm the motor was post flight using a 6x3 prop, the motor may get quite warm with a 6x4 prop;
- I would recommend a battery that is capable of delivering at least 40A to provide the motor what it needs;
- you will need to have and solder on appropriate connectors (I use 3.5mm bullet connectors) to the three motor leads as they are not provided when you purchase the motor.
- More to follow in the coming weeks :)