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Expo, as described above, can make a model slower to respond around center, or much more
sensitive around center, if desired. This is considered to be negative expo or positive expo,
with negative expo being less sensitive around center and positive being more sensitive around
center. A great majority of pilots will use negative expo to tone down the control response
without using Dual Rates. Let’s set up a model using expo on the ailerons.
With the receiver and transmitter turned ON, enter the Menu Functions program by pressing
both the UP and DOWN Edit keys at the same time and then scroll up or down until you reach
the EXP screen. Place SW-3 to the DOWN position for now. The cursor arrow should be
above channel 1, ailerons, at this time. The value shown to the right of the screen should be
0%, indicating there is no exponential value programmed at this time. To decrease the
sensitivity of the aileron function use the (-) Data key to set a value of 30% at this time. Doing
so will mean that you have decreased the sensitivity of the aileron function about 30% around
the center point of the control movement. You may confirm this by moving the aileron stick
slightly and noting that very little movement is being made by the aileron. The movement
should increased greatly as you move the control stick to the extremes of motion. Moving the
SW-3 switch to the upper position should return you to a normal linear response condition and
out of the exponential condition. The procedure for using expo on the elevator and rudder is the
same, except that SW-1 switch is used to activate or inhibit expo for these functions.
Additional information can be found on Page 28 of your Optic 6 Instruction Manual.
THROTTLE CUT
Throttle cut is a way to kill the engine on your nitro or gas powered aircraft without changing
the idle trim setting of your transmitter. The most common method of killing the engine
without Throttle Cut is to pull the throttle trim all the way down, hoping this may be enough to
stop the engine. Afterwards, you have to reset the throttle trim back to where it was, if you
remember that position. On the Optic 6, this is no longer necessary. Using the Throttle Cut
feature, you need only touch one button on the top of the transmitter to effectively kill the
engine without touching the throttle trim setting.
To use this feature, set up the throttle control as you normally would, using the End Point
Adjustment to achieve fully opened throttle and fully closed throttle with a good idle setting.
(It may be necessary to set the actual idle with the engine running). Use the End Point
Adjustment to set the primary low throttle setting with the throttle trim set to the highest
possible position. Make sure that the carburetor throttle stop screw allows the carb opening to
be completely closed when commanded by the throttle servo. Now, enter into the Throttle Cut
option in the Menu Functions program by depressing both the EDIT keys at once and then
scroll up or down to reach the T.CUT screen. The default setting is 0%. With the throttle stick
set to the idle position and after you have set the idle position on the carb to the proper place,
depress the Throttle Cut button located on the top right of the transmitter body. Keep the
button pressed and then use the (-) minus or (+) plus Data keys to make the carb opening on the
engine close down completely. When you release the button, the servo will delay returning to
the normal idle position for approximately 3-seconds, which is normal. The Throttle Cut
option has now been set.