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   HOW TO - Reset the throttle trimmer correctly on Esky 0406 Transmitters

This information applies to the Esky stock 6 channel and also the Esky stock 4 channel TX (transmitters), and also covers both 35MHz and 2.4GHz systems

From my own experience, especially with patients in the heli-hospital, I have found that a great many of the Esky TX units that are shipped with Belt CP and the various CO-AX helis they produce have the throttle trimmer lever incorrectly setup so that the throttle often does not start to spool up until 20% or even more throttle is applied.  More than one patient in the heli-hospital has needed 50% throttle and even more just to to start the motor running.

This means that you will never get it to run at anywhere near full throttle, which is the optimum speed for all electric motors, so you will be using up your LIPO's faster, and will have a lot less lift than you should have.

So if you have this problem, here is how to fix it.

This CAN BE RECTIFIED, and all you need is a sharp knife such as a Stanley or similar, and a soldering iron.


The first thing to do is to remove the 6 screws that hold the back onto the transmitter.  You do NOT need to remove the batteries when doing this.

Split the two halves carefully, making sure you do not the pull the wires that link both parts together, and lay the front down so that you can see the potentiometers that are in fact the stick controls.

Reach around and move the Throttle TRIMMER LEVER and see which bit moves...

You will soon see that it is a a piece of plastic to which a small potentiometer is attached that slides around a little on the side of the main stick potentiometer. The throttle trimmer is connected to the green PCB board on the left as shown in the picture below (my thanks to go to "scouse" from the Heliguy forums for both of the pictures)

By design (and very crude and poor design at that) you will see that it is made up of 2 separate pieces of plastic, and they are "joined together" by simply melting the plastic at the top.  You should be able to see that it looks like a notch made by a smallish screwdriver or soldering iron or something similar.

The first thing to do is to break that joint in the right place, and the easiest way to do this is to use a Stanley knife (box cutter) and gently cut through that "Plastic Weld".  To do this, cut where shown in the first picture BETWEEN the bottom ends of Red and the BLUE lines, where you can see the small gap between the first and second pieces of plastic. You only need to cut it at the top just far enough down to "break" that plastic weld

Once you have done so, you will see that you can now rotate the outer piece of plastic that holds the small trimmer potentiometer with your fingers.  In fact the easiest way its to move that PCB on the left with the 3 connections on it.

Now comes the technical part .....

Either remove your main rotors blades, or remove the motor or move the motor so that the pinion is NOT IN CONTACT with the main gear, and then retighten it in that position away from the gear so that it cannot move.  


Now set the throttle stick fully DOWN, and the trimmer FULLY DOWN, and finally turn the plastic part that holds the small potentiometer backwards towards the BOTTOM STICK POSITION.

Turn the TX ON, and finally arm the heli by connecting the LIPO.

Hopefully the motor will not start, and you should get a normal initialization with all the normal beeps.

Now comes the really clever part.  While keeping the throttle stick AND THE TRIMMER LEVER all the way down, slowly move the PCB part up toward the full throttle position until the motor JUST START TO SPOOL UP. Now pull it back very slightly toward the lowest throttle position so that the motor no longer spools up.

THAT IS THE CORRECT POSITION FOR THE TRIMMER lever, so take your soldering iron and carefully heat weld (melt) the two parts together at the very top in a way similar to the original "joint". You could also use CA glue to lock these together, but a plastic weld is better.

Make sure the "weld" is cool, and with  the throttle stick fully down, try sliding the trimmer lever up slowly. The motor should now start to spool up when the trimmer is about 25% of the way up. If so, slide the trimmer ALL THE WAY DOWN AGAIN, and try the throttle stick. It should start to spool the motor very soon after you start to move it up. 


You can of course do exactly the same with the rudder and cyclic trimmer if you ever find the need to do so.

HAPPY FLYING  - WITH YOUR TX working as it should have when shipped by ESKY

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