62
Digital trim
Digital trim
Functional description and description of C1 cut-off
Digital trim with visible and audible indicators
Both sticks are equipped for digital trimming. When you
give the trim lever a brief push (one “click“), the neutral
position of the associated stick channel changes by
one increment. If you hold the trim lever in one direc-
tion, the trim value changes continuously in the corre-
sponding direction with increasing speed.
These changes can be made “audible“ by way of differ-
ent frequency tones. This makes finding the mid-point
during flight easy, without looking at the screen. When
the midpoint is overrun, a brief pause will be inserted.
Current trim values are automatically stored when a
model memory change is made. Furthermore, digi-
tal trim exercises flight phase specific control within
a memory location (except for throttle/brake flaps
trim) – the socalled “C1“ (channel 1) control function.
These default settings can be altered to “global” in the
»Stick mode« menu, which is available as standard on
the
mc-20 HoTT transmitter only, see pages 108
and 110.
This C1 trim includes yet another special function for
winged aircraft and helicopter models, it allows the
carburettor‘s idle setting to easily be found for a com-
bustion motor.
Since the trim functions described in these instruc-
tions are only effective in the direction “Motor off“, the
presentation in the screen of your transmitter may only
change with respect to individual throttle or Pitch-min
positioning of the C1 stick in the “forward“ or “back“ di-
rection, such as throttle/pitch “left stick“ or “right stick“.
The illustrations in these instructions are always based
on “Throttle/Pitch right“ for both types of models and
“Throttle back“ for winged aircraft and helicopters.
1. Winged models
C1 trimming has a special cut-off trim function intend-
ed especially for combustion motors. This cut-off trim
function is configured as follows: First put the motor
into a safe idle speed.
Now if you push C1 trim in a single motion toward its
“Motor cut-off“ direction until it is in its furthest travel
position then an additional end-position marker will
remain in the display. When the motor is restarted you
can again immediately set the last idle speed with a
single movement in the direction of “more gas“.
GRAUBELE
#01
3:33h
stp
flt
K78
0:00
0:00
RX0.0V
5.2V
Current trim position
2.4
M
Trim at motor OFF position
Last idle position
Idle direction
Ch 1 trim lever
This cut-off trim will be deactivated when “None” is
entered on the “Motor at C1” line of the »Model type«
menu, see page 98.
Notice:
Since this trim function is only effective in the
“Motor off” direction, the display illustrated
above will change appropriately if the C1
stick’s control direction for minimum throttle is
changed from “back” to “front” (on which the above
illustration is based) in the “Motor at C1” line of the
“Basic Settings” menu.
2. Helicopter models
In addition to the “Cut-off trim“ function described
below in “Winged aircraft models“, C1 trimming also
has another characteristic which is made possible by
combining it with a so-called “Throttle limit“ function
see page 122. As long as the throttle limit control – as
standard the right-hand proportional rotary control Lv2
on the right-hand side of the transmitter – remains in the
“rear“ half of its travel path, i. e. in the startup range, C1
trimming acts on the throttle servo as idle trim and the
indication for idle trim is visible in the screen‘s display:
GRAUBELE
#01
3:33h
stop
flt
K78
0:00
0:00
RX0.0V
5.2V
2.4
M
Current trim position
Trim at motor OFF position
Last idle position
Throttle limit control
However, in contrast to winged aircraft models, the
position indicator ( ) will be hidden and any preset idle
position will be deleted when the throttle limit control is
in the “front-side“ half of its travel path.
GRAUBELE
#01
3:33h
Stp
Flt
K78
0:00
0:00
RX0.0V
5.2V
M
2.4
Throttle limit control
Notice for helicopters:
C1 trimming affects only the throttle servo,
not the pitch servo. Notice also that the
helicopter throttle servo must be connected to
receiver output 6, see receiver layout on page 67!
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