GRAUPNER MX-16S, Programming Manual

Page: 26 / 116

26 Description of transmitter – Digital trims
Digital trims
Description of function, and C1 cut-off trim
Digital trims with visual and audible indicators
Both the dual-axis stick units are fi tted with digital trim
systems. When you give the trim lever a brief push (one
“click”), the neutral position of the stick channel changes
by one increment. If you hold the trim lever in one direc-
tion, the trim value changes continuously in the corres-
ponding direction with increasing speed.
The degree of trim offset is also “audible”, as the pitch
of the tone changes to refl ect the setting. When you are
fl ying a model, you can fi nd the trim centre position ea-
sily without having to look at the screen: if you over-run
the centre setting, the trim stays in the centre position
for a moment.
The current trim values are automatically stored when
you switch from one model memory to another. The di-
gital trims are also stored separately for each fl ight pha-
se within a model memory, with the exception of the “C1”
(Channel 1) trim, which is the throttle / airbrake trim on a
fi xed-wing model.
The C1 trim includes another special function which
makes it easy to re-locate the idle throttle setting of a
glowplug motor.
2. Model helicopters
In helicopter mode the C1 trim has another feature in
addition to “cut-off trim”, as described under “Fixed-
wing models” on the left; this time in conjunction with the
“Throttle limit function” (see page 54): while the thrott-
le limit slider is in the bottom half of its travel, i.e. in the
“start-up range”, the C1 trim lever acts as idle trim on
the throttle limit, and the idle trim is displayed on the
screen:
In contrast to a fi xed-wing model aircraft, this display is
suppressed if the throttle limit control is moved to the
“upper” half of its travel.
Note regarding helicopters:
The C1 trim only affects the throttle servo and not the
collective pitch servos; it also works evenly over the full
stick travel. Please note that the helicopter throttle ser-
vo must be connected to receiver output 6 (see Receiver
socket assignment, page 33).
1. Fixed-wing models
The C1 trim features a special cut-off trim which is desi-
gned for glowplug motors:
You initially use the trim lever in the usual way to select
a reliable idle setting for the motor. If you now move the
C1 trim lever to its end-point in the direction of “motor
cut-off”, pushing the lever in a single movement, a mar-
ker appears on the screen in the last position. You can
now return to the idle setting for starting the motor simp-
ly by pushing the stick one click in the direction of “open
throttle”.
The cut-off trim feature is disabled if you enter “none” in
the motor line within the »
Base settings « menu (page
38).
Last idle position
Trim at motor
OFF position
Current trim
position
C1 trim lever