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Channel 1 CURVE
Input
+100%
Curve
Output
+100%
off
Point
H
+100%
0%
–
Note:
Since throttle trim has no effect if the throttle limiter is
open, its position here is meaningless.
Now – without starting the combustion motor – adjust
the throttle servo, preferably mechanically and,
if necessary, also by way of the servo 6 travel
adjustment option in the »Servo adjustment« menu,
so that the carburetor is completely open.
Now close the throttle limiter completely by moving
the side proportional slider all the way to its rear limit.
Use the trim wheel of the Throttle/Pitch joystick to
place the trim position marker into the motor OFF
position or actuate the "Thr. CutOff" option, see
page 90.
Note:
In contrast, when the throttle limiter is closed,
the position of the throttle/collective pitch stick is
meaningless. It can therefore remain at the maximum
collective pitch position so that, when adjusting
carburetor linkages, the throttle limiter alone can be
used to switch between full throttle (throttle limiter
open) and "Motor OFF" (throttle limiter closed).
Now, with the throttle limiter closed, adjust the
carburetor linkages so that the carburetor is (just)
completely closed. Take extreme care to ensure that
the throttle servo does not become mechanically
blocked in either of its end positions (full throttle/
motor OFF).
118 Detail program description - Control adjust | Helicopters
To complete this basic confi guration, the idle trim
adjustment range must now be matched against point
"L" on the throttle curve. Do this by setting Point "L"
of the "Channel 1 CURVE" mixer, in the »Helicopter
mixer« menu, to about -65 to -70 %.
Channel 1 CURVE
+
Input
–100%
Curve
Output
–66%
off
Point
L
–66%
0%
To confi gure a smooth transition from the idle trim
to the throttle curve exactly, the collective pitch stick
should be moved to and fro slightly at its minimum
position with the throttle limiter closed and the idle
trim fully open. The throttle servo must not move as
well! Any further adjustments to the throttle curve
must of course be made later in fl ight.
The motor is always started with the throttle limiter
fully closed, whereby idle is set exclusively by using
the trim wheel of the throttle/pitch joystick and the
motor is shut off by the "Thr. CutOff" option.
Notes:
•
Take advantage of the »
Servo display« to
observe the infl uence of the throttle limit control.
The »Servo display« screen can be reached from
almost any menu position with a simultaneous
tap on the
selection keys of the left touch
pad, Bear in mind that servo output 6 controls the
mc-20
throttle servo on the
•
A servo connected to output 16 can be used,
independently of this, for other purposes by
means of mixers, provided that this servo is
decoupled from the operating element specifi ed
by function input 16 via the »Mix only channel«
menu; see page 205.
•
The throttle restriction set by the throttle limiter
is shown as a horizontal bar in the throttle curve
diagram on the second display page of the
"Channel 1 CURVE" option in the »Helicopter
mixer« menu (see page 180). The output signal
for the throttle servo cannot be higher than the
level set by the horizontal bar:
Channel 1 CURVE
Curve
–
+
off
The above diagram shows precisely this scenario:
in the above example, the throttle limit control
is set to about -60 % and thus restricts the
movement of the throttle servo to about -60 % of
full travel.
HoTT!
Input
0%
Output
0%
Point
?
0%
0%
–
actual
position of the
Throttle limiter
+
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