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  Item found in the following categories;
> Speed Controllers > All Speed Controllers
> Speed Controllers > HobbyKing ESC
> Speed Controllers > 20 to 39 Amp


Hobby King 30A ESC 3A UBEC

Hobby King 30A ESC 3A UBEC

Constant Current: 30A
Burst Current: 40A
Battery: 2-4S Lipoly / 5-12s NiXX
BEC: 5v / 3A
Motor Type: Sensorless Brushless
Size: 54 x 26 11mm
Weight: 32g

Programming Functions:
Battery Type: Lipo /NiXX
Brake: On / Off
Voltage Protection: Low / Mid / High
Protection mode: Reduce power / Cut off power
Timing: Auto / High / Low
Startup: Fast / Normal / Soft
PWM Frequency: 8k / 16k
Helicopter mode: Off / 5sec / 15sec (Start up delay)

User manual can be downloaded from the files Tab.


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Weight: 47g
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Price  $9.99

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 Customer rated
Total of 426 discussions.
Riotnuts  796 points - 5/14/2015
will this Hobby King 30A ESC 3A UBEC work with 12x4.5 prop & 4oa (50abrust)esc on a x-930 octocopter ? reward- for- answer**-buddy code=C57CEB66-6578-48E0-8280-C70BA5F683A7
 Aaron 4 points
it will probably work but it depends on what motor you are using and also what cell your battery is if you have a 2 cell lipo then it would be fine but with anything more than that it would be overloaded
Simon  47 points - 5/6/2015
I have used the ESC on QUADS Hex and Octocopters. Never a problem.
Jacob  3 points - 4/11/2015
Can these be flashed?
 chris 7 points
Good choice for flashing. the programing pads are all in a row at the edge of the board. googleing for the product number(F-30A) will give you detailed info. I run these with simonk on all my multirotors.
 Jacob 3 points
Thanks for the reply, so you suggest Simon K on these ESCs over B-heli, for mutirotors?
 chris 7 points
I've actually never used BLheli. My impression is that it's a bit more complicated, there's configuration involved and it supports helicopters as well as multi-rotors. I haven't been tempted to try it, however many people swear by it. With SimonK you only need to find the bin file that matches your hardware and there's nothing else to think about. At this point I should mention I do all my flashing directly with AVRdude from the command line, I've never been able to figure out the allegedly simple interface of the KKmulti-copterflashtool. Perhaps a BLheli fan can weigh in here?
john  7 points - 3/25/2015
I have just received these from the latest stock at UK warehouse, they are refusing to flash Simonk firmware using the HK flash tool, previously i have had no problem flashing them. I am getting the error message that the chip is not responding .Have they been locked.?
 TANDEM 8 points
Try to enter the programming mode , in part files you find you need to do
 Christ 765 points
hello John, any progress in programming? I intend to buy some for my quad but if we can not program them, they are useless. Please let us know if and how you succeded Thanks
 john 7 points
Yes they do flash, I was having a senior moment and forgot to power them when flashing.!!!!
Kardo  1 points - 3/24/2015
Hi, I have purchased one of these ESC as an upgrade for my AXN Floater Jet 4x Hextronik HXT900 servos. Now I have a problem with the servos, they worked first properly, but now when i connect the battery, only motor works. I hear a noise coming out the servos. Is there any solution or help? Is the ESC dead?
 Sam.Cee 89 points
The ESC wouldnt be dead if your servos make noise yet dont work, because your motor works and that is onely possible with a working ESC, Check the amperage your servos need total, and compare that to what the esc can provide, also if your running more than 4 or 4 that draw alot of current they can possibly not have enough power, or they are experienceing a high frame rate, and if they are analog servos then they can easily purnout, but if they make noise they arent burnt up. When powered can you mnove the servo gears, how about unpowered, perhaps your servos have seized, if they are nylon perhaps youve broke some gear teeth.
Customer Reviews
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excellent cheap ESC, exactly as described, easy to program with TX and very good throttle response. I'm using it with a 4200kv outrunner and 3s lipo with 64mm EDF, great setup!. thanks HK

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Picked this up a week or so ago the unit came in perfect condition. programming was not required as it worked configured out of the bag. it would be beneficial to have a detailed spec sheet on beep config packaged w eack hk unit sold rather than hunting online or waiting for someone to post. would buy or reco again

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I have bought this and receivied few days ago. It was well packed. I had 1 flight with it, and it was good. No problems occured during the flight. After flight it was barely hot. I recommend this esc, because it's possible to program, and it has good price/quality ratio. :)

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Good quality and well built, pre progged from box with generic settings, but easily programmed from TX. Bang on the mark for a speed controller

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It is worth spending the extra dollar or so to have the 3.5 mm connectors already on these esc's. This was money well spent and can handle the rated 30 Amps.

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