EMAX RS2205 2300KV & 2600KV Motors – Cooling Red Bottom EMAX RS2205 2300KV & 2600KV Motors – Cooling Red Bottom
FacebookTwitterGoogle+PinterestredditTumblr On this page I’m going to be giving my opinion on the EMAX RS2205 motors and putting them head to head with the... EMAX RS2205 2300KV & 2600KV Motors – Cooling Red Bottom

On this page I’m going to be giving my opinion on the EMAX RS2205 motors and putting them head to head with the Cobra motor.

You can buy the EMAX RS2205 motors from here:

Indeed, any drone enthusiasts out there may well have heard of these motors as there has been a lot of talk around them recently on numerous drone forums. They sometimes take the name “red bottom” as the motor itself has a red shade on its underside. Regardless of this, both the 2300KV and the 2600 models weigh roughly 30g and look exactly the same from the outside.

However, its the inside where the magic happens…

I’m going to compare these motors to the Cobra 2204. The Cobra 2204 is roughly 5g lighter as it uses less metal on the base and the bell.

EMAX tell us that they used some different types of magnets on these motors (the 2300KV and 2600KV). Also the new design contains “cooling fins” which restrict the coil temperature down by at least 30%.

To fill you in with some basic statistics, the motos have CW and CCW thread rotations and the motor wires are 20AWG.

These motors have CW and CCW thread rotations (optional on product page). The motor wires are 20AWG.

Here they are in comparison to the Cobra. You can tell immediately that they look bigger (and hence are slightly heavier.)

emax-rs2205-2300kv-2600kv-motor-cobra-2204-comparison-768x576

Unboxing The RS2205

Despite its lack of importance in flying the drone, I always love it when a company takes time to package their product up well. EMAX does this exceptionally well. The box comes equiped with 8 motor screws, 3 props nylon nuts and a handy hex key!

Take a look at the photos below to see exactly what I mean.

EMAX does a very good job in the packaging. And it comes with 8 motor screws, 3 props nylon nuts and a hex key.

emax-rs2205-2300kv-2600kv-motor-include-screws-bolts-driver emax-rs2205-2300kv-2600kv-motor-parts-includes-unboxing emax-rs2205-2300kv-2600kv-motor-box-package

EMAX RS2205 2300KV Motor

To be honest, I was very surprised with the performance of this motor. It was very efficient and generated much more thrust than the cobra in almost every test.

The tests used the following setup:

  • ESC: KISS 24A Race Edition – Factory Settings
  • Battery: Turnigy Nanotech 4S 1800mAh
  • Voltage: 16.2V – 16.6V
  • Turnigy Thrust Stand

EMAX RS2205 2300KV Motor Thrust Data

Props % Peak Thrust – g Peak Current – A Max Power – W Efficiency – g/W
Gemfan 4045 50 148 2.3 37.3 3.97
  100 460 9.6 155.5 2.96
HQ 4045 BN 50 257 4.4 71.3 3.61
  100 647 19.3 312.7 2.07
Gemfan 5030 50 295 3.2 51.8 5.69
  100 790 15.0 243.0 3.25
Gemfan 5040 50 304 3.9 63.2 4.81
  100 880 17.8 287.9 3.06
Gemfan 5045 50 342 4.6 74.5 4.59
  100 938 21.6 349.9 2.68
Gemfan 5045 BN 50 395 5.0 81.0 4.88
  100 917 23.3 377.5 2.43
HQ 5045 BN 50 386 6.3 102.1 3.78
  100 989 28.6 463.3 2.13
HQ 5040×3 Triblade 50 411 5.3 85.9 4.79
  100 1050 25.0 405.0 2.59
Gemfan 5045×3 Triblade 50 417 5.4 87.5 4.77
  100 1155 27.3 442.3 2.61

The Gemfan 5045 Triblades prop were from BG $3.5 for 4.

Cobra 2204 2300KV Motor Thrust Data

At first I tested this motor with a Blue Series 20A ESC with BLHeli firmware. However, I was unable to collect enough data as the ESC simply under performed and thus I had to redo the test but with the KISS 24A ESC. The results are shown below.

Props % Peak Thrust – g Peak Current – A Max Power – W Efficiency – g/W
Gemfan 4045 50 133 2.0 32.4 4.10
  100 429 8.9 144.2 2.98
HQ 4045 BN 50 235 4.3 69.0 3.41
  100 588 18.2 294.8 1.99
Gemfan 5030 50 265 3.1 50.2 5.28
  100 718 14.3 231.7 3.10
Gemfan 5040 50 296 3.5 56.7 5.22
  100 810 16.8 272.2 2.98
Gemfan 5045 50 315 4.4 71.3 4.42
  100 837 19.7 319.1 2.62
Gemfan 5045 BN 50 375 4.7 76.1 4.93
  100 865 21.0 340.2 2.54
HQ 5045 BN 50 369 6.4 103.7 3.56
  100 862 27.2 440.6 1.96
HQ 5040×3 Triblade 50 355 5.0 81.0 4.38
  100 875 22.1 358.0 2.44
Gemfan 5045 Tri 50 401 5.2 84.2 4.76
  100 947 24.4 395.3 2.40

EMAX RS2205 2600KV Motor

The 2600KV motor is designed for the 4″ props on a 180 mini quad frame. However, it also works really well with 5030 props and therefore I may use that setup on my next 5″ build. I’ll let you guys know how I get on with that!

The 3S LiPo with 5″ props also works well with this. However, I forgot to test it on 3S! Sorry guys 🙁 I’ll update this post later with the 3S results included. Also, if you have any props that are larger than the 5045, the draw will exceed 30A which is was not good for the 24A ESC I that I used for testing. Oops…

 

emax-rs2205-2600kv-motor-review

Props % Peak Thrust – g Peak Current – A Max Power – W Efficiency – g/W
Gemfan 4045 50 189 3.4 55.1 3.43
  100 529 13.5 218.7 2.42
HQ 4045 BN 50 311 6.4 103.7 3.00
  100 776 27.0 437.4 1.77
Gemfan 5030 50 355 4.7 76.1 4.66
  100 990 21.7 351.5 2.82
Gemfan 5040 50 395 5.3 85.9 4.60
  100 1025 25.6 414.7 2.47
Gemfan 5045 50 430 6.2 100.4 4.28
  **100 1120 30.0 486.0 2.30
Gemfan 5045 BN 50 400 5.8 94.0 4.26
  **100 1074 30.0 486.0 2.21
HQ 5045 BN 50 496 9.2 149.0 3.33
  **100 915 27.0 437.4 2.09
HQ 5040×3 Triblade 50 435 7.0 113.4 3.84
**100 1025 29.0 469.8 2.18

** ESC entered over-current protection at 30A before 100% throttle was reached, so that might not the true full throttle thrust.

emax-rs2205-2300kv-2600kv-motor-side-by-side-768x584

Conclusion

Ultimately, it is clear to me that the RS2205 is a winner. It is easily one of the best motors out there for a 5″ prop and therefore I defiantly recommend that you buy it. However, someone who desires a lighter setup (perhaps for FPV racing) will probably find 30g a little bit too heavy for their drone.

I would also like to mention that during the tests that I performed, the Cobra motor was notably warmer which implies that the RS2205’s cooling fins are working!

  • Framk

    March 19, 2016 #1 Author

    I heard some are having issue with Emax RS2205 2300kv and Kiss KISS 24A Race Edition

    Any thoughts on that ?

    Tks

    Reply

    • admin

      March 20, 2016 #2 Author

      Most of the issues have been due to poor setting up of the cleanflight/ flyduino equivalent and the 2205s are no different in terms of timing.

      Reply

    • Andy

      April 7, 2016 #3 Author

      Got the Kiss-FC and the Kiss 24A Race Edition. Works great with these Motors and BN 5045 Triblade on 210 Lisam!

      Reply

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