QWinOut 2-4S 30A RC Brushless ESC Simonk Firmware Electric Speed Controller with 5V 3A BEC with 3.5mm Female Banana Bullet for 2 to 4s Lipo Battery, DIY Multicopter Quadcopter (30A, 4 pcs)

I initially left a bad review, because after connecting this to an Arduino and trying to activate a motor with a basic servo sketch, it did nothing other than make the ESC beep. Then I did some more research and learned these ESCs have a startup routine needed to "arm" them, AND that I needed to power cycle the ESC after each Arduino update. After doing both of those, then my servo sketch worked.

So when I first tried to use these they wouldn't work at all. My main problem turned out to be not having a common ground because I had different power sources for my Arduino controller and the ESC's/Motors. They all work great and don't seem to have any heating issues yet.Used with 935kv motors and 3S battery, working well so farFOR CALLIBRATING:1. Have motor/reciever sending data2. Throttle up to full3. Power the ESC/Motor3. You should hear 3 D's (means getting power) followed by 1 D (means getting HIGH signal)4. Lower throttle to the minimum5. You should hear 2 D's -- after that you should be good to throttle up

I have been through four of these now, and don’t ask me why I have ordered so many after having so much trouble! Two of them burned out for no apparent reason, likely they are way overrated by their amperage. The other two caused some type of voltage transient, resulting in multiple plane crashes. The whole time I suspected faulty receivers, servos, etc.. After changing them all out and still dealing with the same problem, I switched out ESC’s. Miraculously, no problems! I don’t know how an ESC can cause so many issues, but between the interference and the outright failures, I am zero for four, and many, many lost hours trying to troubleshoot. I can’t steer you away from this product strongly enough!

Good power source.

i BOUGHT THE FOUR SET AND NOW ONLY HAVE ONE THAT WORKS THE SPEED CONTROL GOS OUT AND THE PLANE COMES DOWN TWO THAT ARE WASTED AND ONE GLIDED IN NOT WORTH THE MONEY.

Worked great until out of nowhere one of them stopped working on the lower half of the range.

this esc works exactly as i expected

These are bigger than I expected but they will work fine