Helicopter Mixer - GRAUPNER MC-20 HoTT Programming Manual

Helicopter mixer

Flight phase-specifi c setting of collective pitch, throttle and tail rotor
In this menu ...
Control adjust Dual Rate / Expo
Channel 1 cur ve Switch display
Control switch Logical switches
Phase settings Phase assignment
Non-delayed chan Timers (general)
Fl. phase timers Helicopter mixer
... all of the fl ight phase-specifi c helicopter mixers are
described, with the exception of the mixers for auto-
rotation fl ight (discussed from page 190 onward.)
These mixers are used for the basic set-up of a
model helicopter.
For fl ight phase programming, see the menus:
• » Basic settings, model«, page 84
• » Phase settings«, page 146
• » Phase assignment«, page 148
When the switch for a specifi c fl ight phase is
actuated, then the name of the given fl ight phase,
e.g. «Normal», will be displayed at the lower left edge
of the display screen:
Pitch
Channel 1 Gas
Channel 1 Heckrotor
Tail rot. Gas
Roll Gas
Roll Heckrotor
Nick Gas
Nick Heckrotor
Gyro suppression
Gyro offset
Swashplate rotation
Swashplate limiter
Nor mal
176 Detail program description - Helicopter mixer
In each of these fl ight phases – with the exception
of the auto-rotation phase – the typical helicopter
mixing and coupling functions shown in the screen-
shot above are available for setting up the model
helicopter. These functions are described in the fi rst
part of this comprehensive chapter.
General information on mixers,
(see also pages 159 and 192)
An arrow " " indicates a mixer. A mixer "branches
off" the signal fl ow of a control function at a
particular point, in order to use this fl ow to cause a
predetermined effect on a further control channel
and, ultimately, the receiver output. "Pitch ax
rot" mixer means, for example, that when the pitch-
axis joystick is actuated, the tail rotor servo must also
react within the scope of its setting.
Basic programming procedure:
1. Select the mixer by using the selection keys of the
left or right touch pad.
Depending on the mixer involved, the bottom
display line will show either SEL or the
a change to a second page is necessary).
2. A brief tap on the center
pad will permit direct settings for linear mixer
ratios. Use the selection keys to set the mixer
ratio.
0%
Otherwise you will need to switch to the second
screen page where you can set up the appropriate
0%
curve mixer.
0%
A simultaneous tap on the
0%
the right touch pad (CLEAR) will reset a changed
0%
value in a given active (inverse video) fi eld back to
0%
0 %.
0%
3. Another tap on the center
0° touch pad will complete the entry.
4. A tap on the center
Off
will cause a return to the previous display page.
Tail
(indicating
SET key of the right touch
or keys of
SET key of the right
ESC key of the left touch pad
Description of helicopter mixers
To set collective pitch curves as well as the two
mixers, "Channel 1 Throttle" and "Channel 1
Tail rotor", there are curve mixers available in all
fl ight phases. Accordingly, these mixers also permit
the programming of non-linear mixing ratios along
the path of joystick travel, if required. Switch to the
display screen for curve settings with a brief tap
on the center SET key of the right touch pad, see
description below.
The curve is set up basically in the same way as the
Channel 1 curve for helicopters, but we will describe
it again here in detail using pitch confi guration as
an example, to save you having to leaf through the
manual.
In the remaining lines, fi rst activate the value fi eld and
then use the selection keys of the left or right touch
pad to set a mixer value in the value fi eld (inverse
video).
The settings available are rounded off with the
"Swashplate limiter" option: This option can be set to
restrict maximum defl ection of the swashplate servo
in the sense of a limiter. Together, these settings
confi gure the basic set-up of the helicopter model.
In the "Autorotation" fl ight phase as described
on page 190, however, the mixers "Channel 1
Throttle" and "Channel 1 Tail rot" are not needed
and therefore switched to a confi gurable default
value.
Changed parameters can be reset to their respective
default values at any time with a simultaneous tap on
the or keys of the right touch pad (CLEAR).
Pitch (Pitch curve (Channel 1
If necessary, use the selection keys of the left or
right touch pad to move to the "Pitch" line then tap
briefl y on the center SET key of the right touch pad.
Pitch))