U&L 20A 2-4S Brushless ESC for RC Quadcopter Multicopter Tube Installation

These esc's were made for Multirotors, and they won't let you down. There is no BEC on these, and being flashed with Simonk - you won't have to worry about this ESC cutting out on you if the voltage gets too low (like an airplane esc). I have these exact ESC's on 3 very different multirotors: 1- a gimbal equipped, gopro equipped quad for taking videos...... 2- a 250 sized quad for FPV'n through the woods.....and 3- a v-tail quad for acrobatics. NEVER an issue with the performance of these ESC's - in any of these totally different applications!You will NOT be disappointed with buying these ESC's for multirotor applications.

I'm running these on a FlyingCinema CineTank MkII-L with SunnySky 3508 580KV motors off two 5200mAh 4S 10C batteries (in parallel). They get warm, but not hot since the actual load per ESC is only around 4A when hovering and 7A when punching out. The lack of a BEC is fine for me because I've got a PixHawk to provide 5VDC to everything.

SCROLL DOWN TO THE BOTTOM FOR AN UPDATE.I've had three unexplained crashes on my hexacopter since I started using these ESCs. I don't know that these are to blame, but I suspect they are. Each crash has happened in almost exactly the same way. It appears as if one motor suddenly loses power and the hexacopter immediately leans in that direction and darts off to the side. Trying to counter the uncommanded maneuver has no effect. The telemetry logs for each crash showed that the hexacopter had a good GPS lock each time, so it wasn't a GPS glitch. Here's a link to a video of the three crashes: http://youtu.be/RAxl8ATZMbs.Anyway... After the last crash I decided to replace all six of these. I'm not sure if they were the cause, but I don't know what else it could have been.UPDATE:Since switching to a different brand of ESC flashed with BLHeli firmware I haven't had a single crash. These ESCs will probably work fine with 800KV motors or higher, but don't use them with low KV pancake motors. There is all sorts of info on the internet SimonK ESCs and low KV motors. BLHeli firmware is a much better choice.

these are smooth flying esc. i run them with x2208s sunnysky 1260kv on 9 inch props, and my quadcopter is very agile and covers ground very quickly. is stops, banks, and accelerates on the drop of a dime. i highly recommend these escs.

I tried to edit my recent review but couldn't.Mavbot has the original versions as pictured.just got some Fri. They are great ESC's forsmall quads. BUYERS BEWARE the version 2 (has a V2 in the red area)are not simonk and will not work well on quads!I bought some from andoer (as mavbot was out of them)the photo was of the original version but V2's arrived ! Mavbot seems to currently have the originals in stock !!!!

The controller arrived quickly with minimal documentation. It turned out to be very important to keep the total length of leads short between the motor and the controller -- this includes both the motor leads and the leads on the ESC -- less than 5 inches. Otherwise it stuttered and stalled. Once the leads were shortened, it worked fine - providing smooth reliable control of a brushless DC motor at 2-3 amps. I haven't tested it at higher currents. The ESC can be controlled with the standard Arduino servo library as long as you hold it at zero for 1 sec to "arm" it for use. It uses the Simon-K firm ware. When it starts up, it estimates the number of cells and beeps to let you know what it found. It then monitors voltage and smoothly fades out when battery voltage goes below 9 volts on a 3S pack. In the future, I might have ordered a model with a BEC to provide 5V for servos, but it fulfills its designed function perfectly.

Spiders are some of the best ESCs I've ever used. Make sure you get at least 40a ones if planning to use with 6s.

I couldnt use it, took it to an rc store brandnew and it doesnt work, waste of money and i want a refund