GRAUPNER mc-32

129
Program description - Control adjust | Helicopter models
Because of this, leave this value (initially) at +100 %.
Furthermore, this variable "limitation" of throttle travel
not only provides a convenient means to start and
stop the motor but may also prove to be more than
an insignifi cant safety improvement! For example,
just imagine what could happen if, while carrying the
helicopter to the take-off site with the motor running,
the C1 stick were to be inadvertently operated …
If the carburettor or speed controller is open too far
when the transmitter is switched on, an audible warn-
ing will be sounded and the basic display will show
the message:
Throttle
too
high!
Tip:
Take advantage of the »Servo display« to
observe the in 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 throttle servo on the
mc-32 HoTT!
Basic idle setting
Put the throttle limit into its "full throttle" position by
pushing the throttle limit regulator – by default, the
right side proportional slider Lv1 – all the way to its
forward position limit. Set the throttle/pitch stick to the
maximum pitch position and also check the sub-menu
"Channel 1  Throttle" of the menu …
»Helicopter mixer« (page 190)
… to ensure that a standard throttle curve is active. If,
for example, the standard throttle curve has already
been changed following the initialization of a model
memory then this must be at least temporarily reset
to the values "Point L = 0 %", "Point 1 = +50 %" and
"Point H = +100 %":
Curve
off Point
Output
Input +100%
+100%
H
+
–
100
 O U T P U T
0%
+100%
Channel 1
Throttle
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 nec-
essary, also by way of the servo 6 travel adjustment
option in the »Servo adjustment« menu, so that the
carburettor 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 stick to place
the trim position marker into the motor OFF position
or actuate the "Thr. CutOff" option, see page 101.
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 carburettor
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 carbu-
rettor linkages so that the carburettor is (just) com-
pletely 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).
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  Throttle" mixer, in the »Helicopter
mixer« menu (see page 194), to about -15 to -18 %.
Curve
off Point
Output
Input 0%
+16%
L
+
–
100
 O U T P U T
0%
+16%
Channel 1
Throttle
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 stick and the motor
is shut off by the "Thr. CutOff" option.
Notes:
•
Take advantage of the »Servo display«
to observe the in 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 throttle servo on the mc-
32 HoTT!