ESC for EMAX RS2205 2300kv BLDC

Hey guys!

Complete and utter noob here. I am looking for a suitable ESC for the EMAX RS2205 2300kv BLDC mounted on a Martian II 220mm frame. I already have a Pixhawk PX4 2.4.7 and plan on using that. I will be using the drone for indoor videos and/ or target tracking.

I had shortlisted the Emax BLHeli Series 30A ESC, but saw a lot of people posting about issues with it(esp. on YouTube). As of now, i need a solution which works out of the box and want to avoid the nitty-gritty of the firmware etc.(I also read that EMAX ESCs may face issues with the Pixhawk FC)

I would be immensely helpful if someone could suggest a suitable ESC which comes with the firmware pre-flashed.

Here are a few which i had shortlisted(based on motor ratings and referred this link:

1. Emax BLHeli Series 30A ESC(
2. Emax Bullet Series 35A ESC(
3. Spedix IS30 ESC(
4. Racerstar RS30A V2(
5. Holybro Tekko32 35A(
6. Aikon AK32 35A ESC(

I would be grateful for any help I receive.

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  • Not sure you would go wrong with any of those choices. Best advise I could give is stop reading posts about issues or watching YouTube gripes. In nearly all cases the user is the problem, not the hardware. At KwF we exclusively use Favourite ESCs on small aircraft. Authentic Favourite ESCs are made very well. Other manufacturers sometimes use less reliable hardware. On such a small aircraft, you might want to use a 4-in-1 ESC. These also work great and save space & mass.

    We purchase just about every ESC on the market for testing, and we have never found one that arrived without firmware pre-flashed. Sometimes the firmware is not current, and sometimes the default parameters are not desired; so we reflash, set parameters, and lock out RC programming.

    When we teach robotics to small children, we provide ESCs that are locked down on firmware and all parameters except throttle calibration -- usually Simon-K firmware.

    I would worry more about that Pixhawk 2.4.7. It is a rather old flight controller with very limited performance.


    CTO, Kashmir-Robotics
    • I can also only join. Most of the time it is really the use and only in a few serious cases the device itself. On the other hand, you can be happy about it, because it can also be expensive.
    • Thank you, Ron!
      As i understand from your comment, any of the above mentioned ESCs should be fine for my drone.

      Could you please elaborate on why you have concerns about the Pixhawk?

      Some people have reported that EMAX ESCs have trouble with the Pixhawk, for eg. according to this thread(;

      "I did some digging and came across a few threads of people claiming that EMAX ESCs will not work with Pixhawk because the voltage on the servo rail is 3.3v instead of 5 and the ESC draw pulls that down to 2.8v or 2.2v I don't know how accurate that is, but I was hoping somebody on these forums might have found a work around and/or possibly run into it and discovered they were just overlooking something."

      Is that a cause for concern??

      Thanks again.
      FliteTest Forum
      Welcome to the Flite Test Forums!
      • Let me repeat that the best advise I could give is stop reading posts about issues or watching YouTube gripes. EMAX ESCs are fully compatible with Pixhawk 2.4.7 and with all Pixhawk variants. If you like or have EMAX ESCs, use them. Some small ESCs come with an integral Battery Elimination Circuit (BEC) to provide ~5.5V to the output rail. Most multicopter ESCs do not, If you need voltage on the output rail, and your ESCs do not have BECs, then simply add a small 5.5V BEC to your rail. This is your first aircraft, and it will fly just fine with EMAX ESCs and Pixhawk 2.4.7.

        At KwF we have complex test equipment to help select the best components, but with ESCs I usually tell people to just hold them between your fingers during full throttle for 10 seconds. Some will get so hot they will burn your fingers. Some will just be a little warm. Those are the most efficient. Then weigh them; the least weight is the best.

        I was never a fan of the Pixhawk 2.4.7 because the designers made poor choices for connectors. They fail with wires pulling out of the connectors, connectors pulling out of their slots, and internal board mechanical failures. If you have one and need to save money use what you have. If you can afford a new fight controller try the inexpensive Pixracer, either from mRobotics or other manufacturers including the Pixracer R15. All provide improved performance over the Pixhawk 2.4.7 and feature better cables and connectors.

        CTO, Kashmir-Robotics
        • I took a quick look at the Flitetest forum. The posters attributed failures to hardware that were their failures to understand their hardware and firmware. For example the poster about Pixhawk 2.4.7 rail voltage did not have a clue as to what sets the voltage on the rail of a flight controller. Also the poster about the Pixhawk 2.4.7 not initializing the ESC did not have a clue as to how to initialize an ESC. These are parameters set in the ESC firmware and the Flight Controller parameters. Set them correctly and the ESCs will initialize correctly. In building your first aircraft, ask knowledgeable people for assistance when something does not work as expected. Most all commercial hardware works when operated properly.
          • Thanks a lot for your advice, Ronald. This puts my mind to ease a little.

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