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,1 pcs)

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 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.

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!

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.

Good power source.

I got these escs for flitefest combat expecting them to be damaged during use. upon first powering them I noticed after only 30 seconds of being powered up (not even throttling them up) they were getting really hot to the touch, I unplugged them and let them cool down then calibrated them thinking that might solve the issue. well it didnt. I decided to fly them anyway (I was not worried about crashing a plane meant to go in combat anyway) and to my surprise I did not burst into flames and they landed even cooler than they were on take off. I noticed that the escs were set with high drag brake (motors are stopped when throttled down) I think the over heating issue comes from that drag brake not deactivating when the motors are sitting idle. I would only recommend these escs for use on planes/projects you dont care about I could see an inexperienced person getting these and burning something up. please buy with caution and keep good air flow over them they get hot when idle.

These are bigger than I expected but they will work fine

Liked plugs. Don't like sodering .