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control surface being a bit off. Your Sub-Trim feature on the Optic 6 will assist you here. The
Sub Trims will allow you to change the neutral position of the servo electronically without
doing the same by mechanical methods. In the Main Menu Functions list, scroll down to the
S.TRM option, and select which channel you wish to adjust by using the Left (<) or Right(>)
Cursor key. Once you have selected the channel to adjust, you may use the (+) or (-) Data keys
to trim the neutral position until the control surface is straight as desired. Using the Sub Trim
does not affect the trim tabs or amount of trim available from the trim tabs on the transmitter.
Please note that the use of the Sub Trim is not to replace the requirement to adjust the
mechanical linkages to get the control surfaces as close to neutral as possible. It will assist you
in getting the control surface to neutral in addition to making corrections on the actual linkages.
END POINT ADJUSTMENT (EPA)
End Point Adjustment (EPA) allows you to adjust the position that your servo will stop when
commanded to by the control sticks of the Optic 6. Most model kits and their instructions will
state how much control surface movement is ideal for the aircraft design to fly with for best
results. Using the EPA function, you can match this quite easily. While in the Main Menu
Functions list, scroll down to the EPA option screen, where Channel one, Ailerons, will be
highlighted by the pointed icon, and a default value of 100% will be shown to the right. 100%
value means that for a normal servo, the amount of travel is about 60 degrees from one end to
the other. You may increase this amount to a value of 125%, or about 75 degrees of rotation.
You may also decrease this value down to zero movement.
In use, let us assume you have a typical sport aircraft with the radio system installed and
operational. Turn both the receiver and transmitter ON, and enter into the Main Menu
Functions list by depressing both the UP and DOWN Edit keys at once. Use the UP or DOWN
Edit keys to scroll to the EPA option on the LCD display. Let’s start with the ailerons. The
instructions for your model may recommend 3/8” inch upward movement of the aileron and ¼”
inch downward movement. Hold the Right control stick of your Optic 6 to the right side of the
transmitter and watch the right aileron of your model move upwards. With the control stick all
the way to the right, your aileron may have moved a total of 1/2 “inch up, which would be
more than the recommended motion. While still holding the control stick completely to the
right, depress the (-) Data key, which will decrease the amount of motion from the servo. As
you do so, the aileron will begin moving downward and when it matches the recommended
position of 3/8” inch above the neutral position, you may release the (-) Data key. Now, move
the Right control stick to the left, which will make the aileron deflect down. Again, use the (-)
or (+) Data key as required to make the aileron match the recommended position of ¼” inch
downward movement. That’s it! You have set the end points of the servo movement to match
the model instructions for the ailerons. Repeat this procedure for the elevator and rudder
channels as well.
When it comes to the throttle channel, your task is a bit easier. In most models using internal
combustion engines (nitro or gas powered), you must set the throttle servo to match the
carburetor throttle body. Begin by setting the mechanical linkage such that the throttle is
halfway open and the servo is centered as is the throttle stick on the transmitter. Adjust the
mechanical linkage as required to achieve this. Now, select the throttle position within the