GRAUPNER mx-12 Hott, Programming Manual

Page: 179 / 200

179
Programming example: delta and flying wing
Programming a model delta using the “normal” tail
setting
Alternatively, if you select the “ normal ” tail type in the
“ Base settings ” menu, and connect the servos to the
receiver as shown in the lower of the two receiver socket
sequence diagrams on the left-hand page, then the
aileron function of the two elevon servos will work cor-
rectly, but not the elevator function.
In the “
normal ” tail type you have to force the two ailer-
on servos and the two flap servos to move in the same
direction and provide an elevator effect when an eleva-
tor command is given. This requires the “
elev  NN *”
wing mixers, whose effect can be adjusted separately.
The procedure starts by selecting the …
“Fixed-wing mixers”
menu (pages 108 … 113)
(The following settings are model-specific, and you
must check carefully that they work correctly on
your model before accepting them.)
0%
0%
0%
+55%
0%
+55%
+66%
+77%
+77%
0%
0%
0%
–––
–––
–––
–––
–––
–––
–––
–––
–––
–––
–––
ail
ail
d i f f a i l e .
rudd
flaps
brak
brak
brak
elev
flap
aile
elev
elev
flap
flap
aile
elev
flap
d i f f – r e d
aile
d i f f f l a p s
… where you set values other than zero for these mixers.
With this set-up the tailless model is considered to be a
range of wing mixers which the software makes avail-
able. If you select the “
Delta / flying wing
” tail type, the
software automatically superimposes the elevator and
aileron functions. In this case the mixer ratios can be
adjusted by varying the Dual Rate settings in the “
D/R /
Expo
” menu (see page 102).
If you select “ Delta / flying wing ”, all settings of the
“ NN *  elev ” wing mixers in the …
“Fixed-wing mixers”
menu (pages 108 … 113)
0%
0%
0%
–––
–––
–––
0%
d i f f a i l e .
ail rudd
brak elev
d i f f – r e d
… affect the elevator (up / down) function of the two
elevon (combined aileron / elevator) servos, as well as
the flap / elevator servos.
Notes:
The flap mixers and flap differential only appear in •
the list if you have also entered “2fl” in the “aile/flap”
line at the “Delta / Flying wing” model type; see illus-
tration on the right.
In principle the same applies to the “Brake
•  NN *”
mixers. These are also suppressed if you have de-
cided on “Throttle min forward / back” in the “motor at
C1” line of the “
Base settings
” menu.
Even if you have selected “2aile2fl”, the (digital) ele- •
vator and aileron trims only affect aileron / elevator. If
you wish to circumvent this, it is simpler to program
your model as described in the following section.
“normal” four-flap wing (two ailerons and two flaps), and
therefore has all the options associated with this wing
type. The method involves the “
elev

NN *”
mixers,
which were originally intended only for pitch trim com-
pensation and non-standard applications. In this case
they are “abused” by setting higher values than normal,
in order to transfer the elevator signal to the control
surfaces of the tailless model.
However, none of the fixed-wing mixers includes the
digital trim of the elevator stick - so an alternative has to
be found.
Start by switching to the …
“Transmitter control settings”
menu (page 94)
I5
I6
I7
+
trv
+15% +15%
+100% +100%
ctrl 6
I8 +100% +100%
free
free
ctrl 6
+15% +15%
… and assign the same transmitter control to the inputs
5 and (if required) 6, e. g. the rotary proportional control
CTRL 6. Now move to the “Travel” column and reduce
the travel of the transmitter control for these two inputs
symmetrically to around 50%, or even less, because: the
lower this value, the finer the trim control.
However, if you prefer to use the normal elevator trim
lever, set - or leave - the “
elev  NN *” mixers to 0%,
and instead set up free linear mixers to do the job.
This is done by calling up the …
* NN = Nomen Nominandum (name to be stated)