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  Item found in the following categories;
> Speed Controllers > All Speed Controllers
> Speed Controllers > 20 to 39 Amp
> Multi-Rotors & Parts > Speed Controller > Q Brain Series

  RATED:

Q Brain 4 x 20A Brushless Quadcopter ESC 2-4S 3A SBEC (USA warehouse)

Q Brain 4 x 20A Brushless Quadcopter ESC 2-4S 3A SBEC (USA warehouse)
Q Brain 4 x 20A Brushless Quadcopter ESC 2-4S 3A SBEC (USA warehouse)

The Q Brain provides the perfect power solution for your quadcopter by incorporating 4 x 20A ESCs into one single unit. This keeps the wiring very tidy and allows you to mount this unit in the middle of the frame instead of having to mount an ESC on each arm.

With adjustable low-voltage protection, startup mode and motor timing, the Q Brain is not short on programming features. This and its ability to operate on 2~4S lipoly or 5~12 cells Ni-XX makes it a very versatile ESC.

The Q Brain keeps things simple by having all of the motor leads pre-installed and terminated with 3.5mm bullet connectors. There are 4 x signal leads (one with power) that will plug directly into your flight controller's ESC output ports. A throttle hub is also included for use in applications requiring the use of a shared throttle signal.

Features:
• Convenient all-in-one ESC design
• 4 x 20A output
• Adjustable low-voltage protection
• Fully programmable

Specs:
Input Voltage: 7.4~14.8V (2~4S lipoly)
Cont. Current: 20A x 4
Burst Current (10 sec): 25A x 4
BEC Type: Switching
BEC Output: 5V@3A
Motor Wire Length: 250mm
Dimensions: 70x62x11mm
Weight: 112g

*Note:
This ESC is compatible with the Turnigy BESC Programming Card (sold separately). Please see related items below.



PRODUCT ID: 9020000001


Weight: 143g Quantity: 
USA West Warehouse
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Price $30.53

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 Customer rated
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Total of 53 discussions.
NevadaRocks  2 points - 7/24/2014
 
I am in the process of retrofitting a Multiplex 4 engine Cargo airplane. It originally used old 400 size brushed cans and I am switching it over to brushless motors. I was wondering if all four of the control wires can be connected together in parallel since it needs to go to my standard receiver as the throttle output. Will this freak out the ESC ? The amperage output of this unit is perfect for the anticipated motors and would make for a very clean install. Thank you for your input.
 XXXTechRC 89 points
Hey Nevada. I think I know what you're trying to do here... and i think the included throttle hub is your answer. If the objective is to have all 4 motors spinning equally, (not multi-copter config), then you can connect all 4 control wires to the hub, then connect the one standard plug coming from the hub into your receiver. With the hub, you can also calibrate all 4 at the same time. Easy peasy. Hope this helps!
Andre L B  1 points - 7/22/2014
 
Could this be used on a tri-copter? or Do you have to use all 4 outputs?
 XXXTechRC 89 points
Hello Andre. Yes it can be used on a tri-copter as long as your motor set-up and programming is correct. However, you'll have the extra weight and wires to deal with. Best bet for the tri is to go with 3 individual ESCs. You may have to pay a dollar or 2 more, but in the long run you'll be glad you did. Hope this helps!
Joshua  1 points - 7/14/2014
 
I just bought this ESC and have connected it to 4 DC Brushless Motors (http://www.hobbyking.com/hobbyking/store/uh_viewIte
m.asp?idProduct=47692).
The problem I am encountering is when I write fulls speed to all lines of the ESC M3 takes off slightly before the other 3. Why is this happening? As well it appears that at like 15% power the M3 spins but the other three do not. Is this some kind of programmable or setting? Is something out of sync? Are the motors the cause? *Any help would be appreciated.
 XXXTechRC 89 points
Hi Joshua, how did you calibrate the QBrain? Did you use the throttle hub? That's an easy way to do them all at once. There's vids on YT or maybe even here under videos/files. If after calibrating it still does the same thing, swap 2 of the motor connections and see it the issue follows the M3 path or if it stays with the motor. That's a sure-fire way to determine which side is at fault. As always, use necessary safety and remove props before testing. Hope this helps!
Mark  1 points - 7/9/2014
 
Can you use two of these on an octocopter?Will the speed controllers operate independantly of one another. I am building a quad but thinking about upgrading to a hex or octo in the future. I would prefer to minimize any additional costs. Thanks for any feedback. Mark
 R1B4Z01D 37 points
Yes you can easily use multiple together. I have used two (both with a blown channel) for a hexacopter.
jim  4 points - 6/25/2014
 
I think there's an issue with these where if you shut down too much power on descent, allowing a prop to spin backward in the downdraft, they can no longer bring the power back up. Caught this on video on two different quadcopters.
 R1B4Z01D 37 points
Did the ESC channel burn out or does it still work after landing?
 jim 4 points
The first one was fine. The second I'll know tomorrow.
 jim 4 points
Both controllers are fine. My **theory** about what's going on : Power's down, as the machine falls the props get kicked backward. The props spin up to the point that they are going faster than the ESC needs them to go. (Although the ESC doesn't know they are going the wrong way) So no power is applied to the motors as the machine falls to its death.
 Mark 12 points
This just happened to me today and it wrecked my quad! I was quite high and I was descending rather quickly. I saw my rear right motor stall and spin the opposite direction. It was not recoverable and it free-fell from about 200 feet. I'm relieved that someone has data on this because I was at a loss for the cause. This would have been my forth flight with the new Q-Brain 25A ESC. I thought it may have overheated and turned off, but the manual says that overheating causes a gradual reduction in power, not complete cutoff.
Customer Reviews
Overall Rating
kaptondave
510 likes
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I got mine a couple of days ago and installed it on a custom 500mm quad. Before getting into that let me say that I am very pleased with it. The quality of workmanship and overall appearance is excellent. My first thought when I took it out of the packaging was that is was heavier than I expected. After weighing it however I found that it was almost exactly the same weight, including the installed 3.5mm bullet connectors, as the four Blue Series 20A ESCs it replaced. The wire length was greater than I needed, so by cutting them down I could get the weight down but decided not to do that. I was at a loss about how to install the Q Brain on my quad because there are no mounting holes. I wanted it mounted securely so elected to remove the back of the case and attach it to the deck using nylon screws to avoid the possibility of an electrical short. I then re-attached the case to the back plate using the orig screws. Note that doing this might void your warranty. My quad has 16mm carbon tubes for the arms so I was able to route the ESC wires through the tubes to the motors. Installation was much easier than using individual ESCs. On finishing it I was struck by how clean and neat everything looked with no exposed wires. I have completed several successful flights with the quad and everything worked perfectly. Throttle and control response is very smooth and fast. I h


4 comments. Reply..

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Genetics101
32 likes
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It appears Kaptondave is a lying POS! In his review on 8/19/2013 he clearly states how pleased he is & how clean the build looks & even says he has "several successful flights"! On 9/22/2013 CarbonComposite writes Kaptondave & tells him he likes his review & politely asks him if he has video or pics of his quad & as surprising as it seems Kaptondave writes back on 9/22/2013 (later that evening) an clearly states he can't provide photos because (QUOTE) Have not built it yet! (End Quote)! It really disgusts me that folks blatantly lie like this & sad too, because initially I thought , "cool" this is a good product but then you catch them in their lies & you don't know what to believe. Do us all a favor "Kaptondave" & keep your reviews to yourself! Nobody respects the opinion of a lying POS!


3 comments. Reply..

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Overall Rating
MrMous
29 likes
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If your quad can use this, I don't see any reason it shouldn't have it. Saves a decent mount of weight, and great to be able to program all 4 ESC's at the same time.


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Overall Rating
marlan05
8 likes
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Ordered two of these for some quad builds I was doing. Very good esc's for the price. They work great! Using them with the 2728 1000kv motors on a few builds and no issues! It makes wiring very easy and clean. I will be ordering more!


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QuadFinger
227 likes
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Finally installed mine in an X525 quad frame. It's sandwiched between the top and bottom frame halves and held in place with double sided tape. When exactly centered, you can still fold the quad arms. Hooking it up to a KK2.1 flight controller board should be straight forward but it's not. The KK board requires that M1 connector has the power lead in order to power up the board. The issue is that the Qbrain has it's power lead on ESC 2 or M2 on the KK board. When building with discrete ESC's this in not an issue because all of them have power leads.. You will need to swap the power and ground pins on the connectors of the Qbrain from M2 to M1 leaving the signal lead in place. Then follow the legend on the Qbrain for hook up. I have read a lot about flashing and or programming the Qbrain. I have 2 tri rotors and 3 quads using either Turnigy Plush or Multi Star ESC's and this new one using the Qbrain. I didn't have to calibrate the throttles or use the programming card on the Qb, they come ready for use out of the box for quads (except for the M1-M2 issue). So what's on this quad? KK2.1 FC, Qbrain 20 amp, Orange 6ch Rx, NTM Prop Drive 2826 1200kv and 8x4.5 props. Powered by a 4S Nano tech 2650. It's a 3D rocket and tracks like it's on rails!! I do endorse the Qbrain.


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