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  Item found in the following categories;
> Speed Controllers (ESC) > All Speed Controllers
> Speed Controllers (ESC) > Plane ESC > HobbyKing ESC
> Speed Controllers (ESC) > 20-39A
> Multi-Rotors, Drones & Parts > Speed Controller (ESC) > HobbyKing Blue Series


HobbyKing 20A BlueSeries Brushless Speed Controller

HobbyKing 20A BlueSeries Brushless Speed Controller

Its no “Mystery” where these ESCs are made, now they are available to you at HobbyKing prices.

Built with imported N-Channel mosFET's and an ultra fast Atmel MCU & heartbeat make this a high performance ESC with excellent sync capabilities. This ESC has a 3A BEC for solid reliable servo power.
Programmable via an R/C controller.It allows you to program all functions to fit your specific needs, which makes it efficient and user friendly.
Extremely low internal resistance
Super smooth and accurate throttle linearity
Over heat and over-load protection
Auto shut down when signal is lost or radio interference becomes severe for more than 2 seconds
Supports high RPM motors
Power arming protection (prevents the motor from accidentally running when switched ON)
New Advanced programming software
Programming features:
Brake setting (we recommend using brake for only folding props applications)
Battery type(LiPo or NiCd/NiMh)
Low voltage cutoff setting
Factory default setup restore
Timing settings (to enhance ESC efficiency and smoothness)
Soft acceleration start ups (for delicate gearbox and helicopter applications)
Governor mode(for helicopter applications)
Motor rotation( clockwise\counterclockwise)
Switching frequency
Low voltage cutoff type (power reduction orirnmediate shutdown)
Factory default settings:
Brake:  off
Battery type Detect:  LiPo with Automatic Cell
Low voltage cutoff threshold:  Medium (3.0V/65%)
Timing setup:  Automatic
Soft Acceleration Start Up:  Medium
Governor mode :  OFF
Frequency :  8kHz
Low voltage cutoff type:  Reduce power

Cont. Current: 20A
Burst Current: 30A
Battery: 2-4 Cell Lipo / 5-12 Cell Ni-XX
SBEC: 5V/ 3A Output
Size: 34*23*9mm
Weight: 20g


Shipped from:
International Warehouse



  • Mystery 20A Brushless Speed Controller (Blue Series)

    Combo Price: $11.11   BACKORDER
    Add to Cart

  • HobbyKing Programming card for BlueSeries Brushless Speed Controller

    Combo Price: $3.28   BACKORDER
    Add to Cart

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 Customer rated
Total of 97 discussions.
Søren  3 points - 4/23/2016
can't find it in EU warehouse any more.. need a spare for my tricopter :/
 Tarmo 101 points
It's only 39g. So it's cheap to ship from INT warehouse too.
Just longer shipping times.
Edward  1 points - 2/20/2016
These ESC's have 3 black wires that go to the motor and there are no other markings to indicate which black wires goes to which color motor wire. Are these ESC's auto-sensing, or am I missing something?
 Bobo22 144 points
Connect the middle wires first. Then the remaining two wires on both sides. If the motor spins in the wrong direction simply swap the two outside wires to reverse the rotation.
 Bobo22 144 points
On this ESC you can also reverse the rotation in the programming menu which comes pretty handy if you solder the wires like I do.
DareCDN  48 points - 1/16/2016
If am using two of these ESC for a twin motored plane do I need to remove the red power wire from one of the esc's going into a Y adapter to the RX?? or do these ESC have a BEC that can work together in sinc.
 Bobo22 144 points
If the single BEC output (2A) is sufficient to power your servos go ahead and insulate the red wire on one. I have done it and most people do it as it is always the safest and easiest way to run twins. Otherwise its permissible to connect some ESC directly together with Y adapter but I am not sure about this particular one. You have to consult with the manufacturer as I checked the manual that came, and unfortunately there is no info or any warnings about it. Another alternative if you really need to share the current from both BECs is to wire the loads separate (half the servos to one BEC and half to the other).
 DareCDN 48 points
Thanks for your input.
 Austin_P 1 points
There shouldn't be any problem with using a Y-connector. It gives a bit of redundancy too if one esc fails, the other motor and BEC might be able to get you a better crash landing. My Hexacopter has 6 BECs all in parallel so its fine.
 DareCDN 48 points
Again thanks for your input as well, turns out I am over amping my esc's anyways so I replaced them with 30amps.
 solentlife 195 points
Technically two SWITCH mode BEC's cannot be Y leaded to a single input. But you can Y lead LINEAR mode BEC's without problem. It is recc'd that one red pin be removed from one of the Rx plugs to avoid conflict of the two SWITCH mode BEC's. BUT in saying this - I have connected two SWITCH mode BEC's when the ESC was not clear as to mode type - it works fine. So my advice is - careful testing first before committing to flight. If in doubt - remove one Red pin.
larryj  4 points - 11/29/2015
Would this work for micro rc car?
Meaning Forward and reverse?
 Tarmo 101 points
No reverse on plane/multicopter ESC. Often no brake either (maybe drag brake only).
However! If can understand programming and take SimonK ESC firmware source code, then it is possible to change few definitions and have forward/reverse and possibly brakes too.
I just looked at the code and forward/reverse is possible. Drag brake is also possible. Not sure about full brakes - maybe you need to code a bit for that.
Also car ESC will usually not let you apply reverse when going forward, you need to stop first. That is to save drive-train. Not sure that flight ESC firmware implement that behavior.
In conclusion: Possible - yes with some work. Optimal? Probably not.
You can get pretty cheap small car ESC and ESC/motor combos from usual places, e b a y and a l i e x p r e s s.
Amit  48 points - 11/11/2015
Although these can be flashed to SimonK easily I would not recommend it anymore. Pre-flashed BLHeli ESCs would do a much better job, especially for Mini-Quads
 Austin_P 1 points
Yes agreed. I flashed many of theses with SimonK, but now the Pre-Flashed offerings are as affordable, so it's a waste of time unless you just like doing it. I kinda like it myself
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use these esc's in my 50mm edf's. works awsome but programming is a pain, hopefully new blue series program card will cure this.

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Purchased several of these in the past, will continue to buy, great value

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presi 2, perfetti.
ottimo regolatore al pari di quelli molto pi costosi, molto regolare l'accelerazione senza strappi o "buchi" a 20A continui con 3 celle risulta tiepido dopo 2 minuti.
perfetto, confermo 5 stelle

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I use this on a 12A inrunner because the 12A blueseries couldnt handle the 3 servo's combined with the motor..

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