HITEC OPTIC 6 - S.TRM - Subtrim Settings

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A
irplane Model Function Descriptions
3. Use the Data +Increase or - Decrease key to choose the
amount
of dual rate for that switch position. You may set
the
travel for both sides of the switch simply by flipping the
switch to the other position (the arrow will also switch sides).
If
you wish to return to the original 100% value, press the
Active/Inhibit (Clear) key.
4. Press the Cursor Right key to move to another channel you
wish
to input dual rate settings.
5. Repeat the first three steps for the dual rate settings on the
remaining
channels. Note that you can leave one side of
the
dual rate switches alone. This can be used for
exponential
settings (see next function).
6. Return to the regular operating mode by pressing the two
Edit Up Down keys simultaneously.
EXP - Exponential
You may be new to exponential settings. "Exponential" refers
to
a mathematical function where the curve grows steeper the
further
away from center it gets. Expo is a way to get the
effect
of dual rates without having to flip a switch. The figure
below
will help explain this concept.
Servo
Response
Setting Exponentials
1. Enter the programming mode by pressing the two Edit Up
Down keys (the two keys on the far left) at the same time.
Press
either Edit Up Down key until the EXP menu appears,
as
shown.
2. To set exponential for channel 1, move the arrow by pressing
the
Cursor Right or Left keys repeatedly until the arrow is
under
or over the channel number you want. Now switch the
appropriate
switch up or down, noticing the position of the
arrow.
You can set two values of exponential, one for each
switch
position. By pressing the Data +Increase or
-Decrease keys, you can add or subtract from the numerical
value
displayed. Note that you may pick a value anywhere
from
-100% to +100%. If you quickly want to get back to the
default
0%, press the Active/Inhibit (Clear) key. You should
understand
that you won't see changes in your model's servo
response
unless you move the sticks. To get a feel for how
75%
50%
25%
0%
Much less response
around neutral(compare
with Normal line)
Increasing
exponential
(shallower around
neutral)
Normal
linear
response
Stick Motion
Exponential gives
smaller response for
same stick motion
around neutral
exponential works, just hold partial stick and switch the Exp
o
on and off (one side of the switch should be set to zero expo)
.
You'll see how it affects the servo travel.
3. The values you set for exponential are highly dependent on
both
the model and pilot's preference. I normally recommend
a
start value of about -10% to -20%, and many test flights,
(Linear)
You will notice that exponential has a smooth curve. For this
reason
it is possible to have low sensitivity at low stick angles
(like dual rates), and yet have full motion at full stick deflection.
The
Optic allows you to have two different values of
exponential,
chosen by the same dual rate toggle switches on
the
transmitter, described earlier. You might want to set a dual
rate
at one switch position with zero exponential, and an
exponential
value with 100% dual rate at the other. Then you
can
switch between them in flight and decide which you like
better.
Later, you can combine both dual rate settings and
exponential
on a single switch setting.
There are really two kinds of exponential, "positive" and
"negative." Negative exponential is the one shown above, and
the
type of expo most commonly used, where servo movement
is
softer around neutral. Positive exponential is where the
servos
are very sensitive around neutral and soft at extremes.
It
is sometimes used for helicopter tail rotors.
The Optic allows you to set exponential for ailerons, elevator,
and
rudder.
slowly increasing the number until things are "right".
Obviously
this depends on the pilot and model so go ahead
and
fly it with Expo only on one side of the switch, turn it on
and
off during flight, and change things to suit yourself. Or
don't
use it at all if you don't like it - it's not for everyone.
4. Repeat this procedure for the expo settings on the other
remaining
channels.
5. Return to the regular operating mode by pressing the two
Edit Up Down keys simultaneously.
S.TRM - Subtrim Settings
The Subtrim window is used to make small adjustments or
corrections
in the neutral position of each servo, independent of
the
digital trim buttons. The recommended procedure is to zero
out
both the trims (see settings menu) and the subtrims (this
menu).
Then, one mounts the servo arms and sets up linkages
so
that the neutral position of each control surface is as close to
where
it should be as possible, with the arm 90 ° to the
pushrod. Finally, small amounts of subtrim are used to make
fine
corrections. We recommend that you try to keep all of the
subtrim
values of as small as possible. Otherwise, when the
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