GRAUPNER mx-24s, Programming Manual

Page: 73 / 216

73 73 Program description: Basic settings
anti-clockwise.
“right”: viewed from above, the main rotor rotates
clockwise.
Pressing CLEAR switches rotor direction to “left”.
The program requires this information in order to set
up the mixers to work in the correct “sense”; this ap-
plies to the following mixers which compensate for ro-
tor torque and motor power:
»Helicopter mixers« menu: Channel 1 tail rotor,
Tail rotor throttle,
Roll throttle,
Roll tail rotor,
Pitch-axis throttle,
Pitch-axis tail rotor.
Pitch min.
At this point you can set up the direction of operation
of the throttle / collective pitch stick to suit your prefe-
rence. This setting is crucial if all the other options in
the helicopter program are to work properly in so far
as they affect the throttle and collective pitch function,
i. e. the throttle curve, idle trim, channel 1
tail rotor
mixer, etc..
right-hand rotation left-hand rotation
The meaning is as follows:
“forwrd”: Minimum collective pitch when the collec-
tive pitch stick (C1) is forward (away from
you);
“back”: Minimum collective pitch when the collecti-
ve pitch stick (C1) is back (towards you).
Pressing CLEAR sets this parameter to “forwrd”.
Notes:
• The C1 trim always affects the throttle servo only.
If you need to trim the collective pitch servo only,
use the procedure described in Example 3 on
page 141.
• Most helicopter pilots operate all their models
using the collective pitch stick in the same sen-
se, and if this applies to you, we suggest that you
choose this preset value in the global »
General
basic settings « menu (page 154). This preset is
automatically adopted when you open a free mo-
del memory with the “Helicopter” model type, but
you can still change it to suit a particular model if
you wish.
• A function known as the “throttle limiter” (see page
82) is set by default; this limits the travel of the
throttle servo in the direction of maximum throttle,
acting separately from the collective pitch servos.
This point can be programmed in the »
Transmit-
ter control adjust « menu for Input 12.
Pitch
Expo throttle limit
The “Throttle limit” function is described in the
»
Transmitter control adjust « menu (see page 82);
note that an exponential curve can be assigned to it
by setting the rate of progression within the range -
100% to +100% using the rotary control. This is sen-
sible if, for example, the throttle limiter is required
to regulate the idle set-
ting at the same time.
For further details on the
throttle limiter see the
»
Transmitter control
adjust « menu, page 80.
Example of two exponenti-
al curves for the throttle limit,
using 100% servo travel:
solid line: negative expo values;
dotted line: positive expo va-
lues.
0
2 0
4 0
6 0
8 0
1 0 0
1 5 0
%
0 2 0 4 0 6 0 8 0 1 0 0 %
Control travel
Throttle limit control tr
a
v
el
Thr. limit warning
If the throttle stick is too far advanced when the trans-
mitter is switched on, you will see a warning message
on the screen:
You can adjust the critical position of the throttle ser-
vo within the range 0% and -100% using the “Throttle
limit warning” line; the warning is triggered above the
set point. The preset collective pitch minimum position
of the stick – i. e. “forward” or “back” – is used as the
reference point for the throttle threshold.
The default setting is -70% of control travel.
Pressing CLEAR resets the display to the default va-
lue.
Thr
too
high!