ChopperAddict's Hints & Tips


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   HOW TO - Set up the initial tail servo position on the boom correctly

There is quite a bit of misunderstanding about just how to get the position of the rudder (tail) servo correctly on any helicopter that has it mounted on the tail boom.

In particular, this applies to those helicopters that do NOT have an adjustable push rod for the rudder control, such as the Esky Belt CP.

The "trick here is to set the servo up on the boom so that the servo horns is perpendicular to the servo, and the tail just holds the heli by itself.

The first thing you need to do is to ensure that the mechanical setup of the tail servo is correct, which means that at 50% throttle, the servo horn is as close to perpendicular to the servo as possible.

The next thing you need to do is to DISCONNECT the gyro wire from the RX (Receiver), and the single GAIN wire if you have one (eg : Esky 0704B HH gyros and other HH gyros).  If you prefer you can do this, and then connect the rudder servo DIRECTLY to the RX

Finally, make sure that you still have the servo horn at 90 degrees, as you now have no control over it from the rudder stick on the TX unless you have connected the servo to the RX directly.  Also loosen the two screws that hold the servo to the boom just enough that you can move it manually, but so that it cannot move along by itself.

Check your TX to ensure that ALL trims are correctly set, especially the RUDDER TRIMMER, which MUST BE CENTRALIZED

Put the helicopter on your turntable, and if possible, hold it with your hand to stop it rotating initially, and SLOWLY bring the throttle up to 50%.  The helicopter will almost certainly be trying to turn one way or the other.  Pull the throttle down, WAIT FOR THE BLADES TO STOP ROTATING, and then move the servo one way or the other a little bit at a time until it no longer wants to turn by itself.  When you are reaching this point, let the helicopter rotate on the turntable to ensure that you have it as stable as possible.


Now you can go ahead and reconnect the rudder system and gyro as normal.

If  you have a switchable gyro that provides both RATE and HH modes - 

You should find that the helicopter will still hold its heading with the rudder stick centred. If it does turn one way or the other, you can make a further VERY SLIGHT adjustment to the servo position to get it correct.

Once you have this set, TIGHTEN those servo to boom clamp screws up again nice and firmly so it cannot move by itself.

Try increasing and decreasing the throttle a little more sharply (DON'T EXCEED 50% THROTTLE) to see if the tail is still held reasonably well.  If it wags when you increase the throttle quite rapidly, REDUCE the gain control. If not, increase it until the tail DOES WAG A LITTLE, and then reduce it slightly again to just stop the wag.

That's all there is too it, and the HH mode will simply work correctly all by itself.  You may find that if you switch between Rate and HH modes, that you need to use a little rudder trim to hold it precisely.  This is perfectly normal.

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