Operation Manual

The
"symmetrical
travel adjustment"
option
This option is only available
for
ailerons.
A travel adjust-
ment facility
for
both sides separately
would make no
sense
here; with two differential aileron servos the ef-
fect would be the same as
if
difterential
had
been
ap-
olied.
lf
you
have already tried out some ot the options de-
scribed above,
you
will have no trouble setting up this
f
unction;
it is carried out in exactly the same
way.
Here again:
1000/o
=
maximum
travel; 00/o
=
no travel
Fig. 23
The
"Centre
Trim"
option
This is available
for most
control
functions. lt is used to
shift the centre
position
of the transmitter control
"elec-
tronically";
it
has roughly
the same effect as
moving the
trim sliders.
The maximum
travels which
you
have set are not influ-
enced
by the centre adjustment
(i.e.
it works in the
same
way
as
the
"centre
trim" system used by the trim
sliders).
Fig.24
The adjustment
range is up to
1000/0, i.e. as far as the
end-point
of the corresponding
transmitter control.
The adiustment
procedure
is
simple:
Move to
the
"Transmitter
Options"
menu. Let's look at
transmitter control
D
=
Elevator as an
example.
First
press
the
Z
key and then
leaf through until
"Ctrl
D:ELEV"
appears.
Press the
S
key and
leaf
through
with the
El
key until
"Centre"
appears
in line
3
(flash-
ing). You
will then see this:
r[r
:
ELEl.Jtl
t_:E[.lTFlEr
TEIf'l:
+11:r
Press the
Z
key;
the
value
displayed
at bottom right will
flash. You can carry out the centre adjustment
you
want, using the
E
and
E
keys.
Once
you
have com-
pleted
the
adjustment,
return to the Status display with
the
E
key.
Here
are two
more
examples ot
typical applications
tor
this option.
Example 1:
You have seen that it is
possible
to offset
the
centre
by
up to
1000/0, i.e. to
one end-point.
It
you
select such an
extreme setting
-
in this example for one stick axis the
associated servo
does not move at all when the stick
is
moved to one side.
When it is moved to the other side
the servo carries
out its tull movement.
This facility could be used for a
glider
with
airbrakes:
the brakes are extended
when the throttle stick
is
moved back
from the centre
position.
Over the entire
'lorward'
hal{ of the stick travel
the
servo
does not re-
spond
at all, and stays at
full movement. You now have
full servo travel controlled by
half the stick movement.
Example 2:
perhaps
the most common application!
With
a
well-built and carefully trimmed
model the
posi-
tion of the trim sliders
is not
usually changed
in flight, or
only very slightly.
lf
you
adopt the
position
of the
trim
sliders as
your
centre adjustment,
you
will not need to
alter
the trims
when
you
change
models; the basic set-
ting of the trim sliders
is
then always
the centre
posi-
tion.
Caution: do
not
use the
transmitter control centre trim
facility to
"centre
up
servos". There
is
a separate
facility
provided
for this
(see page
29).
34