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Programming examples - F3A model
After the model is test-own and trimmed, we
recommend reducing trim travel for the elevator and
ailerons. The model has significantly less of a reac-
tion to a movement of the trim wheel. "Over-trimming"
can be avoided, because with full trim travel, under
certain circumstances, the movement by just one
trimming step can have too strong of an effect: There-
fore, the model which previously pulled slightly to the
left, hangs somewhat to the right after the trimming.
For this purpose, switch to the menu …
»Stick mode« (page 104)
… and reduce the number of trim steps in the
“Tr.step” column appropriately:
global
Channel 1
Aileron
Elevator
Rudder
Tr i m
0.0s
Tr.s tep – time +
global 0.0s
0.0s
global 0.0s
0.0s
0.0s
0.0s
0.0s
4
4
4
Phase
2
It may also be necessary to assign appropriate oper-
ating elements and inputs for other model features,
e. g. retractable landing gear, fuel-mix, etc. Make
these assignments with the …
»Control adjust« (page 108)
… menu where a specific input can be assigned to an
operating element, for example, the landing gear can
be assigned to an ON/OFF switch on Input 6 and the
fuel-mix can be assigned to one of the proportional
sliders in the middle console, e. g. the centre slider to
Input 7. However, since it involves flight-phase inde-
pendent settings, leave the standard default "GL" in
the "Type" column:
+33%
+33%
+33%
Aileron
Elevator
Rudder
DUAL
–––
SEL
–––
–––
–––
100%
100%
100%
EXPO
SEL
Normal
–––
(Some experts even use up to a +60 % exponential
ratio.)
Since (some) combustion motors do not react linearly
to movements of the throttle stick, through the menu
»Channel 1 curve« (page 140)
… a "bowed" or, in other words, non-linear throt-
tle curve can be set. Four-cycle motors with Roots
pumps, in particular, such as OS Max FS 120, require
a steep ascension of the curve in the lower speed
range. However, the corresponding values must be
adapted. The C1 control curve for the motor could
appear as follows:
Channel 1 CURVE
Curve
Point
Output
Input –50%
0%
1+
100
O U T P U T
0%
Normal
on
1
Only three interpolation points, "L" at -100 %, "H" at
+100 % and "1" at -50 % give the control travel the
rounded curve above.
Basic procedure:
Move the C1 stick and, along with it the vertical
line in the graph display, toward idle to about -50 %
0% +100%I5
I6
I7
I8
Ty p
+100%
0.0 0.0
– travel + –time+
0% +100%
+100%
0.0 0.0
0% +100%
+100%
0.0 0.0
0% +100%
+100%
0.0 0.0
GL
GL
GL fr
Sl2
---
---
---
---
offset
GL fr
Normal
2
SEL
The control travel of the operating elements must be
adapted and can also be reversed with a negative
travel setting.
Note:
For retractable landing a delay during open-
ing and closing can be specified that will not
work for the Landing Gear Servo C 713 MG,
No. 3887.
F3A models fly comparatively fast and thus react
"harshly" to the control movements of the servos. How-
ever, since small control movements and corrections
are not optically perceptible, because this results in
inevitable point deductions in competition, we recom-
mend setting an exponential control characteristic of
the stick. For this purpose, switch to the menu …
»Dual Rate / Expo« (page 132)
Experience has shown positive results with values of
approx. +30 % on the ailerons, elevator and rudders,
which you set in the right column with the selection
keys. In order to be able to control the F3A model to
run smoothly and cleanly:
325


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