Readytosky 2-4S 40A Brushless ESC Electronic Speed Controller 5V/3A BEC for F450 450mm S500 ZD550 RC Helicopter Quadcopter(4PCS)

These readdytosky esc are just perfect for a drone with a 14 to 16 inch blade. There light weight for a 40a esc and work really well with high current motor you can have them give a boost amprig of 50a for to attest 10 second which is relly helpful when you have to going full throttle before you crash with out blowing of your esc. but what I really like Is the 2 capacitor that (look great quality also) they give a very stable current to power your othe drone parts like flightcontroller becouse it so stable you shouldn't have any problems with the sensor on the drone. there definitely a great price for the quality

As advertised

Took the drone off and after about 30 seconds in the air the esc exploded causing it to crash to the ground snapping the frame.

I’ve purchased over 10 of these ESC’s for a drone project and more than half have failed prematurely due to the capacitor leads coming undone during runtime. This leads to short circuits and potentially dangerous flammable situations. If these capacitors were properly secured I would highly recommend the product because they work great. I wish the capacitors were more secure because the product fits my drone great without having to solder or add additional wire leads.

Update: They sent a new ESC and everything works beautifully now. I like these esc's because they don't heat up even after 20 minutes of flight. I only just received the new one so I'll stress test it more later.Update 2: I've now used these ESC's in 3 different drone builds and I love them.... however I have discovered a second one that had a manufacturing defect which is unfortunate. Basically one of the 3 connectors to the motor was too short, so you can't put a bullet connector in it. I've attached a picture, it's the plug farthest on the left. You can see it's not as deep as the others. I took off the heat shrink tubing from the motor and was still impressed with the design. It has a large metal block that is used as both a heatsink and an EM shield. When they work they run cool and clean.Pros: Fantastic ability and design for the priceCons: It seems 1/7 of them tend to have some form of defect. I have built 2 quadcopters and 1 hexacopter with these ESC's. I will still buy them but remember to test them first on a motor you don't like.Original Review:I was building a new drone and decided to use these ESC's. I hooked up the first one and it worked really well, the motor tested and spun smoothly. I hooked up the other 3, calibrated them, and did a full motor test. 3 of the ESC's worked, one of them arrived dead.I tested that motor with one of the other ESC's and it worked just fine. I have contacted customer service and if they can help me replace the broken one I will increase it to 5 stars.

One out of four didn’t work. Return date had expired . I received a replacement. I should have tested all four when received but waited until I had to install them in an airplane.The seller was very nice about the resolving the problem. Will buy from them again.

ESC caught fire! Destroyed my airplane... Seller will insult you even after I proved these ESCs destroyed my $400 airplane. Seller sent replacement ESCs.....but still told me it's my fault lol

Bench tested these using a 4S battery and 2212 motor and configured with PWM signal. Runs cool and smooth. It has tight bullet connectors for the motor which nicely avoids the need for soldering. Good value for 4x 40Amp ESC's.