GRAUPNER MC-22S, Programming Manual

Page: 90 / 180

90 Program description: Mixers
Helicopter mixers
Mixers variable separately in fl ight phases
This menu describes all the helicopter mixers which
can be varied separately in each fl ight phase, with the
exception of the mixers for the auto-rotation phase,
which are covered in detail in the section starting on
page 99. These mixers are used for the basic set-up
of a model helicopter.
For details of fl ight phase programming please refer
to the following menus:
• »Auxiliary switch« , page 75
• »Phase setting« , page 79
• »Phase assignment« , page 80
Whenever fl ight phases have been assigned, the acti-
ve fl ight phase is displayed at the bottom edge of the
screen, e.g. «Normal».
General information on mixers (see also pages 84
and 101)
An arrow “ ” indicates a mixer. The mixer “bleeds
off” the signal fl ow of a control function at a particu-
lar point, and the derived signal is then allowed to af-
fect the “input” of another control channel in a defi ned
manner, so that it affects a particular receiver out-
put. For example, if you set up a “Pitch-axis
tail ro-
tor” mixer, the tail rotor servo will follow the movement
of the pitch-axis control system when you operate the
pitch-axis (elevator) stick. The movement is proportio-
nal, and the degree of “following” can be varied.
Five-point curves are available for the collective
pitch curve in all fl ight phases, and for the two mi-
xers “Channel 1
throttle” and “Channel 1 tail ro-
tor”. This means that you can program a non-linear
response curve along the travel of the corresponding
stick; see also »
Channel 1 curve « menu, page 70.
Switch to the screen page for setting a fi ve-point cur-
ve with a brief press on the rotary control or the
EN-
TER button; see below. The curve is set in basically
the same way as the Channel 1 curve for helicopters,
but we will describe it here again in detail to save you
having to leaf through the manual again.
Basic programming procedure:
1. Select the mixer with the rotary control pressed in.
The bottom line of the screen now shows SEL or
the arrow button (depending on the mixer); se-
lect the arrow to switch to the second screen page.
2. A short press on the rotary control with the SEL
fi eld in inverse video allows you to set the mixer
ratio directly: use the rotary control to set the ap-
propriate mixer value.
( CLEAR = 0%.)
3. A second short press concludes the input process.
4. Press ESC to move back to the fi rst page.
Collective pitch
P i t c h
I n p u t - 6 0 %
C u r v e O u t p u t - 6 0 %
o f f P o i n t ?
®
O
U
T
P
U
T
- +
1
10
0
A short press on the rotary control or the ENTER but-
ton switches to the second screen page.
In contrast to the » Channel 1 curve « menu, this dis-
play refers only to the control curve of the collective
pitch servos, whereas the “Channel 1 curve” menu af-
fects all servos which are affected by the throttle / col-
lective pitch stick.
Note:
The output signal of the »Channel 1 curve« acts
as the input signal for the collective pitch curve
which you program at this point: the vertical line
in the diagram, which moves in parallel with the
throttle / collective pitch stick, refl ects the actual
Channel 1 curve.
The control curve can be defi ned by up to fi ve points,
termed “reference points” in the following section.
These can be placed at any point along the stick tra-
vel, and the locations can be different for each fl ight
phase.
Initially the three standard reference points are all you
need to set up the collective pitch curve. These three
points, namely the two end-points at the bottom end
of the stick travel “L” (low = -100% travel) and the top
end of the stick travel “H” (high = +100% travel), toge-
ther with point “1”, which is exactly in the centre of the
stick travel, initially defi ne a linear characteristic for
the collective pitch curve.
The programming procedure in detail:
If you have not already done so, switch to the fl ight
phase whose name appears on the screen, e.g.
«Normal».
Setting and erasing reference points
You will fi nd a vertical line in the graph, and you can
shift this between the two end-points “L” and “H” by
moving the associated transmitter control (throttle /
collective pitch stick). The current stick position is also
displayed in numeric form in the “Input” line. The value
lies in the range -100% to +100%.
The point at which this line crosses the curve is ter-
med the “Output”, and can be varied at the reference
points within the range -125% to +125%. This control
signal affects only the collective pitch servos. In the
P i t c h = >
C h a n n e l 1 T h r o t t l e = >
C h a n n e l 1 T a i l r o t . = >
T a i l r o t . T h r o t t l e 0 %
R o l l T h r o t t l e 0 %
R o l l T a i l r o t . 0 %
P i t c h a x . T h r o t t l e 0 %
P i t c h a x . T a i l r o t . 0 %
G y r o s u p p r e s s i o n 0 %
S w a s h p l a t e r o t a t i o n 0 %
t