UNIVERSAL Helicopter
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6.3 Adjust the throttle servo
The throttle servo is servo 1, and it is controlled by the
DYN.THROTTLE mixer.
In this mixer HELI-THROTTLE is input 1. This input is
affected by the THROTTLE curve set for the trans-
mitter control COLLECTIVE PITCH.
Inputs from ROLL, PITCH-AXIS and YAW can be
mixed into the throttle curve. This opens the throttle
slightly to provide the slightly higher power required
when these commands are given. However, for our
example we will leave these inputs at their default
value (0%).
Move the COLLECTIVE PITCH stick forward (maxi-
mum) and check on the model that the carburettor
moves towards full throttle. The THROTTLE curve is
set up in such a way that full throttle coincides with
COLLECTIVE PITCH maximum, and idle with
COLLECTIVE PITCH minimum.
If necessary you can reverse this using the following
steps, which by now will be familiar to you:
1. Press the button
The servo number flashes.
Select servo 1 (DYN.THROTTLE) with /
2. Press the button
The code number for the mixer input flashes.
Select the HELI-THROTTLE input with /
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 HELI-THR. mixer input to servo 1.
6.4 Adjust the curves
The three curves for COLLECT. PITCH, THROTTLE,
TAIL ROTOR and FLARE are options relating to the
COLLECTIVE PITCH stick. The usual reminder at this
point: all these curves can be set differently for
each flight mode.
We will start with the
COLLECTIVE PITCH CURVE
The COLLECTIVE PITCH curve defines the connec-
tion between the position of the COLLECTIVE PITCH
stick and the COLLECTIVE PITCH mixer input to the
three swashplate servos.
Starting from the operating screen you can move to
the COLLECTIVE PITCH curve as follows:
Button Effect and further steps
3 x Menu 1, call up Transmitter control
adjustments and open the Controls
field (control name should flash)
Select the COLLECTIVE PITCH con-
trol with / or the digi-adjustor
Open the select field (flashes)
Select COLLECTIVE PITCH CURVE
with / or the digi-adjustor
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V@YDEiiXi\V@Q.?ADVNS
[V@QQiVBEWF
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Since AUTO-ROTATION has priority, that mode must
be switched off so that we can work on the collective
pitch curve for the flight mode „Hover“.
First we raise the number of curve points to 5. This is
the procedure:
1. Press the button
3-PNT flashes.
2. Press the button to set the desired number of
curve points.
For our example we select 5-PNT.
Now press 2 x to open the curve. The screen
should look like this:
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You can now select each point on the curve in turn by
moving the COLLECTIVE PITCH stick. The screen
shows the number of the point at bottom right, and at
the same time the associated marker on the curve
flashes.
In its default form the COLLECTIVE PITCH curve
values are located at -100%, -50%, 0%, 50% and
100%.
We can make these settings rather more useful in
practical terms by shifting the curve points. Select
points 1 to 5 on the curve one after the other using the
COLLECTIVE PITCH stick and set the following val-
ues using the digi-adjustor:
Point Value
1 -70%
2 -30%
3 20%
4 60%
5 100%
The net effect is that we have flattened out the curve
slightly in the central range, and have also offset it into
the positive COLLECTIVE PITCH range. These val-
ues are unlikely to be perfect for your model, and you
will have to establish the optimum settings through
actual flight testing.
TIP:
If you open the curve you can adjust the curve points
using the digi-adjustor while the model is in flight.
For safety reasons
keep the keypad cover shut all the time you do this.
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