GRAUPNER mc-16 Programming Manual page 285

»Servo adjustment«
S1 0% 100% 100%
S2 0% 100% 100%
S3 0% 100% 100%
S4 0% 100% 100%
S5 0% 100% 100%
Rev cent
... servos can now be adapted for appropriate "direc-
tion of rotation", "neutral position", "travel" and
"limitation" to the requirements of the model.
In this sense, all settings which serve to compensate
servos and make minor adaptations to the model are
"necessary".
Notes:
• The maximum possible throw of a Graup-
ner servo is 150 % per side, based on both
mechanical and electrical reasons. For ex-
ample, if the sum of the values of the column
"Centre" and one of both columns of "Servo travel"
exceed this limit, the respective servo can no long-
er follow the control commands starting from this
point. Therefore, please bear in mind that mixers
and settings in the »Dual Rate / EXPO« menu
also have an influence on servo travel.
• The settings options provided in this menu for
asymmetric servo travel do NOT serve for achie-
ving differentiations for ailerons and/or flaps.
There are options better suited for this purpose in
the »Wing mixers« menu, page 168.
In the last column, "- limit +", the basic settings of
150 % can, and perhaps should be, significantly re-
duced.
The values entered in this position act as a "limiter",
(page 106)
whereby the setting is actually for which point of travel
the respective servo may not exceed, so that it does
not start up mechanically and thus unnecessarily draw
current. In this case it is the end of available mechani-
cal play on the servo, rudder and/or steering which is
decisive for the value to be set.
+
tr v
An example of this would be the selection of
a model with cruciform tail, with which the
rudder moves in a wedge-shaped cutout of
the elevator. In order to prevent the rudder on the
elevator starting up and possibly blocking it, the travel
is normally mechanically adjusted (at the linkage) so
that the rudder does not start with the full throw of the
stick. As long as the rudder is only controlled with the
corresponding stick, there will not be any further
problems with this. But at the moment, when in addi-
tion to the normal rudder signal a mixer also influ-
ences the rudder, such as an "AIL  RUD" mixer
(aileron to rudder), it is possible that the two signals
can sum to an excessive extent.
A correctly set limit of travel intercedes precisely at
this point and thus reliably prevents the mechani-
cal starting of the rudder. The limit of travel should,
however, not be too small, so that the rudder throw is
permanently and excessively limited.
Of course, the travel on both sides could also be
reduced, so that a start-up would not even occur with
an addition of the maximum values. With this method,
however, the prevention of an occasionally occurring
event would result in a permanent reduction of the
normal rudder throw.
The following menu, which is only available as standard
on the mc-20
to model aircraft specialists:
HoTT transmitter, is not just of interest
»Stick mode«
Ch.1 GL 4 0.0s
Aile PH 4 0.0s
Elev PH 4 0.0s
Rudd PH 4 0.0s
Tr St time
In addition to the generally interesting adjustment of
the increments in the column "Tr" (number of trim
increments for each "trim lever click") for digital trim-
ming – separate adjustments for each of the four trim
lever – in the case of the (later) programming of flight
phases in the second column of this menu you can
select whether the trimming of transverse, altitude and
side should operate "GL(obally)" in equal mea sure over
all flight phases or separately in each (flight) "PH(ase)".
The "Time" column, on the other hand, is not of interest
for this initial programming.
The settings made up to this point are sufficient to
permit basic flight of winged and motorized mo-
dels – though the latter does require a correctly set idle
stick direction in the "Motor on C1" line of the »Model
type« menu. However, the "fine-tuning" is still missing.
The fine-tuning certainly adds to the enjoyment of flying
over the course of time. Therefore, if you can already fly
your model safely, you should delve into the menu...
»Wing mixer« (beginning on page 166)
... where various options are available, depending on
the specifications made in the »Model type« menu,
page 98.
Since this section deals with a model having only 2
servos in the wings, the Multi-flap menu beginning on
page 177 is not shown.
Programming examples - Winged models
(page 108)
0.0s
0.0s
0.0s
0.0s
+
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