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HobbyKing TR6A receiver to make a Esky Frankenstein 4in1


Where to buy:
HobbyKing TR6A Receiver

Spektrum DSM2 compatible Receivers
Spektrum DSM2 compatible Receivers
Servo extensions – 300mm1000mm

I love my FlySky FS-TH9x.  So much so I use it to control most of my fleet.  The advantage is the receivers are super cheap at about $10.  Since the 9x is very programmable, you change a lot more settings such as end points, subtrims and throttle curves, which isn’t possible with the stock transmitter.

If you have a Esky helicopter like a Lama v3/V4 or Honey Bee, you can mod the 4in1 so it can use other transmitters like the FlySky FS-TH9x.  The 4in1 acts as the brains of the helicopter.  It has a receiver, mixer, gyro, and ESC all in one, hence 4in1.  The receiver board on all the Esky 4in1’s I’ve seen are removable so it makes it easy to replace.

I like having one transmitter control all my stuff.  So in order to do this you need to replace the receiver in the 4in1 of the Esky heli’s.  This should apply to other 4in1 modules as well.  I have a FlySky FS-TH9x radio and want to use that to control my Esky helis.  The FlySky receivers are also very cheap at about $10.

You’ll need:

2x servo extension wires (short ones that are a couple of inches should do)
4in1 controller
HobbyKing/FlySky  6CH T6A receiver (a 4CH reciever would work too)
Foam, tape

Take apart the 4in1, and remove the receiver portion.  It’s the one with the antenna.  We only need the mixer/ESC/gyro portion.

Remove the plastic housing on the servo extension wires to expose the pins.  I used wire snips.  Be careful not to damage the pins.  We need to plug them into the remaining part of the 4in1.

Plug them into the Esky mixer/ESC.  Bottom is rudder and top one is throttle.  From left to right, -/+/signal wire.  (Don’t go by the photo, I plugged it in wrong in the photo)
The wires I used were way too long…. so I had to coil them up.  Put a piece of foam to protect it.

Plug the other ends to the T6A reciever.  From left to right, -/+/signal.  CH1 = aileron, CH2 = elevator, CH3 = throttle, CH4 = rudder

Tape the 2 halves together.

Here is a pic of it mounted to my Lama V4.

You now have a working frankensteined 4in1.  It will now work with your FlySky/iMax/Turnigy 9x.  Be sure to bind the receiver to your transmitter.  You will have to go to your transmitter to reverse some servos or adjust some endpoints to make it work.  Both my Honey Bee V2 and Lama all run off of my 9x transmitter now and it’s great.

Instead of the T6A, you can use a Spektrum AR6100 or whatever receiver you choose to work with your favourite transmitter.

Here is a video of it in action with my Esky Lama V4.  Also some other mods I did to it.

3 Responses  
  • james writes:
    April 17th, 20106:11 amat

    nice hack! Was wondering if i could do something similar as I’m getting the same transmitter. Do you think its possible to convert my old 35mhz 4in1 from my honeybee into 2.4Ghz using this method? It would be cheaper for me to do it this way.

  • ken writes:
    April 17th, 201011:22 amat

    Yes you should be able to convert a 35mhz to 2.4ghz. Just take out the receiver portion of the 4in1 and replace it with another receiver. In my case I used a TR6A receiver.

  • james writes:
    April 18th, 201010:59 amat

    Thanks! Will give it a try and let you know if I get round to it!

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