GRAUPNER mx-24s, Programming Manual

Page: 198 / 216

198 Programming examples: Model helicopter
tions of rotation of the individual servos.
The basic aim here should be to keep servo travels
at +/-100% wherever possible, as this maintains best
possible system resolution and accuracy. Use the
“Rev” point if necessary to reverse the direction of ro-
tation of any servo; do check carefully that the direc-
tion you set really is correct. The tail rotor servo must
operate in such a way that the nose (!) of the helicop-
ter moves in the same direction as the movement of
the tail rotor stick.
In the menu ...
»Stick mode« (page 77)
Pitch/thr
Roll
0.0s 0.0s
Pitch ax. 0.0s 0.0s
Tail rot. 0.0s 0.0s
Tr.step
SYM ASY SEL
Thr Lim
global
global
global
Trim
4
4
4
4 0.0s 0.0s
– time +
SEL
… you can set the size of the increment for each “trim
lever click” in the “Tr.step” column.
With model helicopters the C1 trim only affects the
throttle servo. This trim (“Cut-off trim”) has a number
of special features, but we will not discuss them again
in detail at this point; please refer to the section on
page 34. (Thanks to the
digital trims of the
mx
-24s,
the transmitter automatically stores the trim values
when you switch models, and optionally even when
you switch fl ight phases.)
This menu also includes another helicopter- specifi c
setting: at this point you can determine the function
of the trim lever located adjacent to the collective
pitch stick: select the “
Throttle limit ” setting in the
“Pitch / thr” line. In this mode the trim lever corres-
ponds approximately to the familiar idle trim. However,
if it is pushed right forward, the throttle limiter (set up
later) will smoothly release the full travel of the throttle
function; this is assigned to “Input 12” in the menu …
»Control adjust« (page 78)
0% +100%+100%
+100%
ASY SYM ASY SYM SEL
0%
0%
0%
+100%+100%
+100%+100%
+100%
0.0 0.0
0.0 0.0
0.0 0.0
0.0 0.0
«normal »
SEL
–time+
9
offset –
Thr.l
Input
Input
Input
Cnt.
free
free 9
10
11
12 free
… where it is designated “Throttle limit 12”.
This input serves as throttle limiter. It acts solely on
output “6”, to which the throttle servo is connected. By
default the throttle limiter is assigned to the right-hand
side-mounted proportional control “CONTROL 9”.
Just to remind you:
The throttle limiter does not control the throttle ser-
vo; it just limits the travel of this servo in the forward
direction in accordance with its selected setting. The
throttle servo is usually controlled by the collective
pitch stick via the throttle curve you have set up; this
is the reason why Input 6 must always be left at the
“free” setting. For more details please see the sec-
tions on pages 81 and 82 of the manual.
Select the ASY fi eld in the “-” column, and in-
crease the value in the highlighted fi eld from 100% to
125%, with the throttle limiter pushed fully forward.
0% +100%+100%
Thr.l +125%
offset
SEL ASY SYM ASY SYM SEL
– –time+
0%
0%
0%
+100%+100%
+100%+100%
+100%
0.0 0.0
0.0 0.0
0.0 0.0
0.0 0.0
«normal »
Input
Input
Input
Cnt. 9
free
free
free 9
10
11
12
This ensures that the throttle limiter cannot possibly
restrict the full throttle travel set by the collective pitch
stick when the model is in fl ight.
You have now completed the basic settings at the
transmitter, i. e. the procedure which you will need to
use time and again when setting up new models.
Battery
Free, or speed governor
Free, or gyro gain
Motor speed
Free, or pitch-axis (2) servo (4-point linkage)
Tail rotor (gyro system)
Pitch-axis (1) servo
Roll (1) servo
Collective pitch or roll (2)
or pitch-axis servo (2) servo
Batt
9
8
7
6
5
4
3
2
1
10
Free, or aux. function
Free, or aux. function
Receiv
er
The mixer ratios and mixer directions relating to the
swashplate servos for collective pitch, roll and pitch-
axis are pre-set to +61% in each case. These settings
are found in the menu:
»Swashplate mixer« (page 145)
SEL
S W A S H M I X E R
P i t c h + 61%
R o l l
P i t c h a x . + 61%
+ 61%
If the swashplate does not respond correctly to the
stick movements, the fi rst step is to change the mixer
directions from “+” to “-” if necessary. The second step
is to move to the menu …
»Servo adjustment« (page 74)
Servo 1 => 0% 100% 100% 150% 150%
Servo 2 => 0% 100% 100% 150% 150%
Servo 3 => 0% 100% 100% 150% 150%
Servo 4 => 0% 100% 100% 150% 150%
Rev
SEL SYM ASY SYM ASY
cent. – travel + – limit +
SEL
… and reverse the servo directions if required. In the
same menu you can also set up the travels and direc-