UNIVERSAL Helicopter
- 10 -
The final stage is to adjust PITCH-AXIS
Servo 3 alone is responsible for PITCH-AXIS move-
ments. If the PITCH-AXIS stick is moved forward
(away from you) servo 3 (in our example) should raise
the rear edge of the swashplate. Servos 2 and 4 have
no role in PITCH-AXIS control, and should not move.
Therefore the first step is to switch off the PITCH-
AXIS inputs in the mixers for servos 2 and 4.
Three steps are necessary:
1. Press the button
The servo number flashes.
Select servo 2 or 4 with /
2. Press the button
The code number for the mixer input flashes.
Select the input V-PITCH AXIS with /.
The „V“ stands for virtual and indicates that
this mixer input has been prepared to cope
with virtual rotation of the swashplate. How-
ever, for our example we will not use this fea-
ture.
3. Press the button
The word ON flashes.
Switch it OFF by pressing the button.
When you have completed these three steps for both
servos, servos 2 and 4 have no PITCH-AXIS input.
Move the PITCH-AXIS stick and check that this is the
case.
Now we can correct the direction of movement for
servo 3 if necessary.
Move the PITCH-AXIS stick forward (away from you)
and watch how the swashplate responds. As stated
above, servo 3 should now move the swashplate up. If
not, you need to use the reverse facility.
1. Press the button
The servo number flashes.
Select servo 3 with /
2. Press the button
The code number for the mixer input flashes.
Select the input V-PITCH AXIS with the /
buttons.
3. Press the button
The numeric value to the right of the screen (-
100%, 0% or 100%) should now flash.
4. Press the button
This reverses the V-ROLL mixer input to servo 3.
Once you have carried out all these steps the
swashplate should respond correctly when you
move the transmitter controls for COLLECTIVE
PITCH, PITCH-AXIS and ROLL.
6.2 Adjust the tail rotor servo
You will recall that we „created“ a free mixer for servo
5 called TAIL-MIX.
Free mixers have a default travel of 0%. We must
therefore set the direction and travel for the tail rotor
servo for the system to work.
To do this we move to Menu 1 and select SERVO with
the button, and then press for TRAVEL/CURVE.
The menu should look like this:
[JFEW@ii\DIAQ/ZAU
-\DIAQE@D@Eiii@YiiS
2iiiiiiiiii2iii5
2iiiiiiiiii2?\i
If servo 5 does not appear, press and select it with
/ or the digi-adjustor.
Now we open the curve with the button. The cen-
tral double line (equals sign) and the numeric value
(0%) should flash.
1. Move the YAW stick to the left-hand stop
2. Set tail rotor servo travel (e.g. to -100%)
3. Move the YAW stick to the right-hand stop
4. Set tail rotor servo travel (e.g. to 100%).
This completes the adjustments for the tail rotor at the
servo side. Everything else is done at the transmitter
control end.
What about static tail rotor compensation?
The COLLECTIVE PITCH input to the tail rotor is de-
fined by the TAIL ROTOR curve which is an option of
the COLLECTIVE PITCH transmitter control. For each
flight mode this option has its own curve.
How does the tail rotor servo
respond to the YAW stick?
You can set the response of the YAW stick to different
values for all five flight modes. This is done by
changing the travel of the transmitter control for the
YAW stick. Move to Menu 1: Transmitter control ad-
justment, and the screen should look like this:
\iN)
V@YDEiiIi\TIGiiiIU.S
[DEIWFQ
iiiiiiiiiii4ii5]
IMPORTANT!
The travel of the transmitter control can be varied
independently for each side of neutral. The arrow next
to the value +100% shows that right-hand travel is
currently selected, i.e. if you open the field with the
button you can change the travel for a stick movement
to the right. If you want to adjust the other half of the
travel you must move the stick slightly to the left and
hold it there. The arrow reverses direction and the
value will be -100%.
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