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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.
NB - YOU WILL NEVER
GET IT TO BE TOTALLY STEADY.
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 -
MAKE SURE IT IS SWITCHED TO RATE MODE
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