Order Numbers
F4090 - F4091 - F4092
F4095 - F4096 - F4097
After the 6th trim increment the dis-
play reaches the top limit of the
screen. At this point the display chan-
ges to a single arrow, which indicates
the direction in which the trim has
been moved.
The display scrolls in the appropriate direction, so that the com-
plete bar travel can be seen. The display also changes, and the trim
button must be pushed twice to update the display and add a furt-
her square.
To help you locate the neutral point easily, when the neutral posi-
tion is reached the trim briefly "misses", and you will hear a double
beep.
Release the trim button at this point, and you have found the exact
neutral position. With a little practice you will find that you can
adjust the trim values "blind", and can locate the exact neutral posi-
tion without having to look at the transmitter itself.
Any major trim value offsets from the neutral point should be cor-
rected at the servo output arm or pushrod, otherwise you will
notice a difference in servo travel to each side of centre.
All the other trims work on the same principle.
7.12.1 Trim parameters
In this menu you can adjust the digi-
tal trim parameters "trim travel" and
"increment size".
These are stored in the model
memory, and thus can be optimised
for each model separately.
7.12.2 Trim travel (RATE)
For some applications it is necessary
to reduce the normal trim travel
(approx. +/- 15%). If the trim travel is
reduced, the value for the individual
trim increments also becomes smal-
ler, i.e. finer trim control becomes
available.
This is essential in some cases, especially when using a Heading
Lock gyro, in order to set the neutral position with great accuracy.
In the case of SMM gyros in AVCS mode it may even be desirable to
switch off the trim entirely (Rate 0%), in order to prevent accidental
trim changes.
To adjust the trim rate select the appropriate transmitter control
(1…4) using the "S" or "H" button, and rotate the 3-D hotkey to set
the desired value.
7.12.3 Trim increment (STEP)
In this sub-menu you can set the size
of each increment or step which
occurs when the trim button is pus-
hed.
The increment can be adjusted in
steps of 0 to 30.
A small increment size produces very fine trim control, but requires
more button-pushes in order to offset the trim by a relatively great
amount.
At the other extreme a large increment means that the trim can be
adjusted quickly, but the trim offset per increment is not so fine.
Table of trim increments:
Step 0
=
Trim switched off
Step 1
=
120
Button pushes
Step 4
=
30
Button pushes (default value)
Step 8
=
15
Button pushes
Step 10 =
12
Button pushes
Step 20 =
6
Button pushes
Step 30 =
4
Button pushes
7.13 Motor cut (TCUT)
The purpose of this option is to ena-
ble you to cut the motor without
adjusting the idle trim. You will
require an external mixer switch for
this function, connected to socket 5
(see Section 4.7).
Use the 3-D hotkey to adjust the position which the throttle servo is
to take up when you operate the switch. The set value of 0…+/-
40% corresponds to the idle trim travel of /- 15%. The pre-
set position varies according to the throttle stick position.
For use with internal-combustion engines asymmetric throttle trim
should also be activated (see Section 7.1.4).
-
Find your way to the Select menu "TCUT".
-
A brief press on the 3-D hotkey takes you to the Setup menu; the
"%" display flashes.
-
You can now change the percentage value by rotating the 3-D
hotkey; a good starting point is 25%. Hold the 3-D hotkey pres
sed in for 1 second to revert to the default value (0%).
-
Press the "S" button, and "INH" (OFF) flashes. Rotating the 3-D
hotkey to the left switches the mixer on (ON); the symbol "Mix"
appears on the screen to indicate an active mixer.
The screen
shows the symbol "ON" or "OFF" depending on the position
of the switch.
-
If the throttle cut is still switched on (ON) when you switch on
the transmitter, the software activates a mixer alarm: the screen
shows the symbol "MIX" and the beeper sounds. Reverse the
position of the external mixer switch (5) once to switch off the
alarm.
-
This alarm function is inten-
ded to remind the user that
the carburettor is completely
closed, and the motor there-
fore cannot be started.
-
To start the motor the throttle
cut function must be set to
"OFF".
-
Now carefully set the percen
tage value so that the carbu-
rettor is closed, but the push
rod does not strike its end-
stop.
-
If you operate the external
mixer switch to switch off the
throttle cut, i.e. for running the engine normally, the screen
displays "OFF".
7.14 Stopwatch (ST-W)
The software includes a stopwatch
which can be set to count up or down,
and is started either by a transmitter
channel or a separate mixer switch.
This function can be used to record
your model’s flight times (counting
up), or to record motor runs (counting
down), e.g. with an electric-powered model. In either case the stop-
watch can display the results on the screen.
The following section explains the stopwatch setup process using
the example of an upward counting stopwatch with a pre-set time
of 1 min 10 sec; the timer is to be controlled by the transmitter
throttle channel 3.
24
Servo
travel
Trim travel
Throttle
shut-off
travel
