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Program description - Control adjust | Helicopter models
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:
Thr
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
four-way button, Bear in mind that servo output 6
controls the throttle servo on the mc-16 HoTT and
mc-20 HoTT transmitters!
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 Lv2 – all the way to its forward
position limit. Set the throttle/pitch stick to the maxi-
mum pitch position and also check the sub-menu “C1
Throttle” of the menu …
»Helicopter mixer« (beginning page 184)
… 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 %”:
Input
Output
Point
?
+50%
+50%
+50%
C1
normal
Thro
Curve
off
Note:
Since throttle trim has no effect if the throttle
limiter is open, its position here is meaning-
less.
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 lever of the Throttle/Pitch stick to place the trim
position marker into the motor OFF position or actuate
the “Thr. CutOff” option, see page96.
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) complete-
ly 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 “C1 Throttle” mixer, in the »Helicopter mixer«
menu, to about +15 to +18 %.
L
0%
+16%
normal
+16%
Input
Output
Point
C1 Thro
Curve
off
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 engine or motor is always started with the throttle
limiter completely closed; the trim lever of the throttle
/ collective pitch stick trim only affects the idle range,
and the motor engine is stopped using the “cut-off
trim” function of the digital trims; see page 62.
Throttle limiter in conjunction with digital trim
In conjunction with the throttle limiter-default the right
side proportional rotary slider Lv2 sets the C1 trim
mark at the set idle position of the motor can be turned
off from the from the motor through the trim.
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