Operation Manual

You will
see
this:
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Press the
[!
key, select servo No. 3 and repeat the
whole
thing
for
this servo.
The
assignment
process
is
now
complete.
You have now
"
informed"
your
transmitter that:
Servo
No. 2
operates
V-TAIL,
and Servo No. 3 operates
V-TAIL.
It
also
knows
that
it is
to
place
the appropriate mixer
betore each of the two servos. In more
abstract terms:
you
have
assigned servos 2 and 3 to the
"V-Tail
higher
mixed function".
Leave the menu in the
usual
way.
Now we come to setting
up
the mixer.
Move to the
"
Servo adiustment" menu. Press the
Z
key to
select
the sub- menu
"TRAVEL
+
REVERSE".
Select servo
No. 2 in
the usual
wav
You will see this:
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Elt' ELEtltlr
Press
the
\l
key
and adjust the lhrow to the one side
(stick
back) and then the other side
(stick
forward),
just
as if setting up
in
the
normal way.
There is no reason in
this case why
you
should set unequal movements, so
set both
to, say, 400/o.
lf
you
have an actual model to hand while
you
carry
out
this
practice procedure,
check at this
point
that
"up"
on
the stick makes the elevator rise. lf this is not the case,
press
the
El
key, and it will be reversed.
Note:
lf
you
set mixing
ratios
which add up to less than 1000/0,
then
the mixer will operate in a
"
lineat" fashion, and
the control signals
will never
be
restricted. You
could,
on the
other hand, leave both inputs at, say, 1000/0. In
such a case,
if
you
apply elevator or
rudder
one at a
time,
you
will
have full
travel available.
However,
as
soon as the sum of the two
inouts
for either control sur-
face exceeds 1000/0, i.e. when a lot of elevator and
rud-
der are applied simultaneously, the movement will be
restricted, as the servo and the control surface cannot
move to more than 1000/o of maximum. The etfect
is
aerodynamic
asymmetry which can be disturbing.
"
Linear" mixing
(no
more than 1000/o) is the most
elegant
solution, but in
practice
a setting
part-way
between
the two extremes has
proved
a very effective
comoromise.
Now to the rudder
input.
Press the
Z
key, then
El.
"ln-
put:
ELEVATOR" is now replaced
by
"Part:
RUDDER".
You will see this:
r5EFj.
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r.r.
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[:+ FIU[r[rEr
Press the
Sl
key again, then set the
"
ruddet" input for
both directions of
rotation; in
our example 600/0 for each
side.
Here
again, check that
the
control surfaces
move
in the correct direction
(if you
have a model handy).
Reverse the function, if necessary with the
E
key.
We hope
you
didn't Jind that all too confusing. Never
mind
-
you
can
repeat
the
whole
operation
now for
servo No. 3!
Note:
Bear in mind that the travel inputs for the mixers
can be
switched ON/OFF or assigned to a
physical
switch.
lf
you
are
not
sure how to do this
please
refer back to
page
30.
And now a more complex
example
At
the start of this Section
we
discussed a model which
featured
pitch
trim compensation for camber-changing
flaps
and spoilers, and elevator to
flap mixing.
We will assume that transmitter
control
B has
been
assigned
to
the
"elevator"
function,
control D to the
"spoiler"
tunction and control F to the
"flap"
function.
The following
servo assignments have also been made:
Servo No. 2: elevator
Servo
No. 4:
spoilers
Servo No. 6: camber-changing flaps
Here we
come to another special
feature
which,
although
it has nothing
to do with mixing, is important in
an indirect
sense.
We will assume that the
"basic
position" (spoilers
closed) of
control
D is
"forward";to
extend the spoilers
the stick is
pulled
right back.
At the
basic
position
a
very large
signal
is
already
present
-
namely full travel forwards.
Of
this a certain
proportion
would reach the elevator, and then would
need to be
"compensated
away" by some means.
The
transmitter offers a better alternative,
namely
the
"
Normpos"
(Normal
Position)
control option.
lf
you
have not
yet
tackled this feature,
you
should do it now;
otherwise
you
will encounter
problems
in the next
sec-
tion. Please reler to
page
37.
You must
set this option to
"forurards"
(forward
arrow
in
the display).
Assuming,
that
is,
that
your
spoilers are
retracted with the
stick
forward!
This action comoensates for the undesired basic mixino
inout
before
it räaches the mixer. lt has no eflect
at
aä
on the signal to the spoiler servo itself.
From now
on take care that control C
is
set
to
one
or
other of
its
end-points
for
all
your
adjustments.
Alterna-
tively,
you
could switch the
"SPOILER"
input
off
when
adjusting the elevator, as described above.
But enough of the
preliminaries.
First
step,
as always: assigning:
Move to the
"Assign
servos"
menu with
the
key
sequence
El El [l N
.
For servo No. 4
(spoilers)
everything is clear; there is no
mixing. So,
iust
as with
"normal"
assignment, first
select servo
No. 4,
then assign
"SPOILER"
to
it.
Now to the elevator.
Select servo
No. 2,
then
press
the
Z
key; the
control
tunction field starts flashing. Leaf through with the
E
key.
Once again the
lamiliar
"list
of options" appears.
After
"FIXED
VALUE"
and
"
ELEVA'IOR+
":
47