GRAUPNER mx-16 ifs, Programming Manual

Page: 72 / 132

72 Program description: wing mixers – fi xed-wing model
Fixed-wing mixers
a i l
a i l
d i f f a i l e .
rudd
flaps
+
0%
brak
brak
brak
elev
flap
aile
elev
elev
flap flap
aile
elev
flap
d i f f – r e d aile
SEL
+
0%
+
0%
+
0%
+
0%
+
0%
+
0%
+
0%
+
0%
+
0%
+
0%
+
0%
d i f f . f l a p s
(The display varies according to the information you
have entered in the “Motor on Ch 1” and “aile / fl ap” lines
in the »
base sett. « menu. The selection above equates
to the setting “no (motor)” and “2ail 2fl ”.)
The
mx
-16iFS transmitter’s program contains a series
of pre-programmed coupling functions, and all you have
to do is set the mixer ratios and (optionally) assign a
switch. The number of pre-programmed mixer functions
in the mixer list will vary according to the pre-set “model
type” (tail type, number of wing servos, with or without
motor – see the section starting on page 46). For ex-
ample, if your model is not fi tted with camber-changing
fl aps, and you have not entered any fl ap servos in the
»
base sett. « menu, the software automatically sup-
presses all the fl ap mixers, as are the “Brake
¼
N.N.*”
mixers if you enter “Idle forward” or “Idle back” in the
“Motor on Ch 1” line. This makes the menus clearer and
easier to understand, and also avoids potential program-
ming errors.
Notes:
There are various alternative methods of positioning •
the camber-changing fl aps; these include:
a) Settling on just one position per fl ight phase,
simply by setting appropriate trim values in the
»
phase trim « menu;
b) Controlling the fl aps manually using any trans-
mitter control assigned to “Input 6” (in the » con-
tr set. « menu – see page 58), after setting the ba-
sic fl ap positions in the » phase trim « menu, as
described earlier. Ideally the transmitter control
would be one of the INC / DEC controls (CTRL 5
or 6), as their positions are stored separately for
each fl ight phase.
The selected transmitter control directly operates
the two fl ap servos connected to receiver outputs
6 and 7, assuming that you have specifi ed fl aps in
the “Aile / fl ap” line of the »
base sett. « menu. The
same control determines the fl ap setting of the ai-
lerons via the percentage value entered in the
“fl ap
¼
aile” mixer line.
For fi ner control of the fl ap positions, we recom-
mend that you reduce their travel to about 25% in
the »
contr set. « menu.
c) It is also possible to leave the default setting of
“0%” in the appropriate line “fl ap
¼
aile” of the
» wing mixer « menu, and to assign the same
transmitter control to both input 6 and input 5 in
the »
contr set. « menu. The magnitude of the ef-
fect on the two pairs of wing fl aps can then be ad-
justed using the servo travel adjustment facility.
If a transmitter control is assigned to input “7”, it will •
be de-coupled by the software if two camber-chang-
ing fl aps are defi ned; this is intentional, as it elimi-
What is a mixer?
The basic function
In many models it is often desirable to use a mixer to
couple various control systems, e. g. to link the ailerons
and rudder, or to inter-connect a pair of servos where
two control surfaces are actuated by separate servos. In
all these cases the signal which fl ows directly from the
“output” of a transmitter stick to the associated servo
is “bled off” at a particular point - this effect can also
“concealed” in transmitter control options such as »
D/R
expo « or » contr set. « – and the derived signal is then
processed in such a way that it affects the “input” of an-
other control channel, and therefore eventually another
receiver output.
Example:
Controlling two elevator servos using the elevator stick:
3 3
8
Se
rv
o
4,8 V
C 57
7
Be
s t.
-N
r.
4
1
0
1
Se
rv
o
4,
8 V
C 57
7
B
e
s
t.-
N
r.
41
01
Function
input
Control channel
(receiver output)
Servo 1
Servo 2
Mixer
Transmitter
control
The
mx
-16iFS transmitter software contains a large
number of pre-programmed coupling functions as
standard, designed to mix together two (or more) control
channels. The mixer required in this example is sup-
plied “ready-made” in the software, and just has to be
activated in the “tail” line of the »
base sett. « menu in the
form of “2 elev sv”.
The software also includes three freely programmable
linear mixers in the fi xed-wing and helicopter programs,
all of which can be used in each model memory.
For more information please refer to the general notes
on »
free mixer « in the section of this manual starting on
page 88.
* N.N. = Nomen Nominandum (name to be stated)