GRAUPNER mx-16 ifs, Programming Manual

Page: 78 / 132

78 Program description: helicopter mixers – model helicopter
Helicopter mixers
Flight phase-specifi c mixers for collective pitch, throttle and tail rotor
In the » base sett. « menu a method of switching fl ight
phases can be activated by assigning the appropriate
switches to “Phase 2” and “Auto-rotation”. You can then
switch between the phases “normal” and a second
phase – to which you assign a more appropriate name
yourself, if necessary – using one of the switches SW 1
… 4. The third phase – Auto-rotation – has precedence
over the other two phases.
Please note that switching
to auto-rotation always has priority over the other
two phases.
If you have not yet assigned switches for the fl ight
phases, you should do so now. Use the rotary cylinder
to move to the switch symbol at bottom right, then press
the rotary cylinder briefl y.
10:01 C3
SEL
3
1
pitch min
clock front
phase 2 hover
autorotat.
Phase 1 always bears the designation “normal”. Both
the number and name of this phase are permanently
assigned, and cannot be altered. For this reason the
“normal” phase is not stated as Phase 1 in the »
base
sett. « menu; it is simply concealed.
“Phase 2” is assigned the default name “hover”, but you
can change this if you prefer. Hold the rotary cylinder
pressed in to select one of the following names:
hover •
aerobat(ic) •
aero 3D •
speed •
test •
Description of the helicopter mixers
Five-point curves are available for setting up the control
characteristics of “collective pitch”, “Ch 1
¼
throttle” and
“Ch 1
¼
tail rotor”. Using these curves it is possible to
program non-linear mixer ratios along the travel of the
transmitter stick for these mixers. Move to the display
page for setting 5-point curves by pressing the
ENTER
button or the rotary cylinder (see below).
In contrast, the mixers “Ch 1
¼
throttle” and “Ch 1
¼
tail rotor” are not required for the “Auto-rotation” fl ight
phase (described in the section starting on page 86);
instead they are automatically switched to a (variable)
pre-defi ned value.
A value must be entered in the “Gyro” and “Input 8”
lines: press the rotary cylinder, then enter a value in the
highlighted fi eld using the rotary cylinder – in a similar
fashion to changing the transmitter centre position or the
offset position with other radio control systems. Pressing
the
CLEAR button resets this parameter value to 0%.
All these options are required for the basic process of
setting up a model helicopter.
The name of the currently selected fl ight phase is
displayed in the »
heli mixer « menu as well as in the
transmitter’s basic display; this is designed to ensure
that any changes you make actually apply to the appro-
priate fl ight phase. Note that the servos do not change
from one setting to another abruptly; they move smooth-
ly with a transition time of around one second. This does
not apply to auto-rotation: when you switch INTO auto-
rotation, the change takes place immediately.
If you operate the switch selected for a particular fl ight
phase, the associated fl ight phase is superimposed at
the bottom edge of the screen, e. g. “normal”:
ch1
ch1
ptch
thro
tail
normal
gyro 0%
SEL
inp8 0%
Now you can program the settings for this fl ight phase.
ptch (Pitch curve (Ch1
¼
collective pitch))
Select the “ptch” line and press ENTER or the rotary
cylinder:
ptch
input
output
point
3
0%
0%
0%
normal
The control curve can be based on a maximum of
fi ve nodes, known as “reference points”, which can be
placed along the length of the control travel; separate
curves can be programmed for each fl ight phase.
However, in most cases it is suffi cient to use a smaller
number of reference points when defi ning the collective
pitch curve. As a basic rule we recommend that you
start with the three default reference points offered by
the software. These three points, i. e. the two end-points
“Point 1” (collective pitch minimum), “Point 5” (collective
pitch maximum) and “Point 3”, exactly in the centre of
the travel, initially describe a linear characteristic for the
collective pitch curve; this is represented in the picture
above.