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EPA (End Point Adjustment)
EPA (End Point Adjustment)
1 6
The EPA function is used to set (or limit) the travel of each
servo, and may be set anywhere from 0% and 125% for each
travel direction. Reducing the percentage settings reduces the
total servo throw in that direction. The EPA function is normally
used to prevent any servos from binding at the ends of their
travel.
Note: We recommend that before setting end points you first confirm
the direction of travel for the servo and reverse it if necessary using
the servo reverse function as noted on page 22. Then center all
the control surfaces as closely as possible by adjusting the pushrods
or other mechanical linkages between the servos and the horns on the
control surfaces.
Then fine-tune the centering in the sub trim (S TRM) function screen as
noted on page 22.
Setting up End Points
In this menu function you can set aileron up and down travel,
up and down elevator travels, right and left rudder travels, open
and closed throttle positions, and aileron up and down travels if
you have a second servo for the left wing.
You can also set the end point travel of flaps and landing gear.
Note: If you change the EPA setting to 0%, you will not have any servo
response in that direction, and will probably crash.
When you first enter the EPA menu, you'll see the default
screen as shown.
The CH (channel) "1" right aileron is flashing and the travel
value sits at 100%. Notice that you can change the R/D indicator
symbol above the value to L/U by moving the stick to the left.
You are about to see how this allows you set the travel
directions independently for each stick motion.
Optic 6 Sport - Page 18
!
Tip
The following instructions to set aileron end points is based
on an airplane using one aileron servo for both ailerons.
This servo would be plugged into the #1 channel of the
receiver.
IF your airplane uses two aileron servos, one for each
aileron, and you are in the ACRO mode, do the following:
Plug the right wing servo into ch. 1 and the left wing servo
into ch. 6. Activate the Flaperon mix as shown on page 24.
Adjust the servo's direction of travel and end points
as necessary.
IF your airplane uses two aileron servos, one for each
aileron, and you are in GLID mode plug the right wing
aileron servo into ch. 1 and the left wing aileron servo into
ch. 5. Activate the ADIF, or aileron differential function as
shown shown on page 33.
Adjust the servo's direction of travel and end points as
necessary.
Aileron End Points for Aircraft with one Aileron Servo
1) To set the RIGHT TURN aileron motion (which is upward on
the right wing and downward on the left wing), move the
aileron stick all the way to the right and hold it.
The right wing's aileron should move upward and the letters
"R/D" should appear above the percent value, meaning you
are setting "R" for Right aileron turn.
2) If your servo is stalled or binding, you'll hear a buzzing sound.
Hit the minus -Decrease DATA button until the buzzing stops.
If the servo is not buzzing, leave the setting at 100%. If you
can, choose a location for the pushrod on the servo arm so
that the throw is adjusted in the 90-100% range.
3) To set the maximum travel of the LEFT (downward) motion,
move the aileron stick all the way to the left and hold it. The
letters "L/U" should appear above the percent sign (as shown
in the figure above). ("L" is for Left aileron turn). Again listen
and hit the -Decrease DATA button until the buzzing stops.
If the servo is not buzzing, apply the same value as you did
for the right turn setting.
EPA (End Point Adjustment)
Elevator end points
1) To set the UP elevator motion, press on the Right CURSOR
button until CH "2" is flashing.
Now move the right stick all the way toward the transmitter
bottom and hold it. The letters "L/U" should appear above
the percentage value. (Indicating you are setting "U", the
UPWARD motion of the elevator-which also happens to be
the upward movement of the control surface.
Again listen for a buzzing sound to indicate that the servo is
stalling, and hit the -Decrease DATA button until the buzzing
stops. If the servo is not buzzing, leave the setting at 100%.
2) Repeat the previous step to set the DOWN elevator by
moving the stick all the way toward the top of the transmitter
(R/D will light up). While the elevator is in full down position,
check for binding and buzzing and reduce the travel value as
necessary.
Throttle end points
1) To set the throttle position at IDLE, first return to the regular
display (push both DATA buttons) and push the trim button
to the right of left-hand joystick to set the throttle trim to read
0% on the screen.
2) Then go back to the EPA menu and press the Right
CURSOR button until channel number 3 is blinking.
Now move the throttle stick all the way to the transmitter
bottom and hold it. The letters "L/U" should appear next to
the flashing percent sign. Push the -Decrease DATA button
until the servo moves the throttle plate to a nearly - but not
completely - closed engine idle position. If necessary when
testing the motor, you may increase or decrease the travel
of the servo at idle so you can't accidentally shut off the
engine using the trim tab.
3) To set the FULL throttle position, move the throttle stick all
the way to the transmitter top and hold it. The letters "R/D"
should appear next to the flashing percent sign. Listen for a
buzzing sound to indicate the servo is stalling,
and hit the -Decrease DATA button until the buzzing stops.
If the servo is not buzzing, leave the setting at 100% or
change your linkage as necessary to fully open the throttle.
Optic 6 Sport - Page 19
Rudder end points
1) To set the RIGHT rudder motion, press the Right CURSOR
button until the indicator moves over channel 4. Now move
the left stick all the way to the right and hold it.
The letters "R/D" should appear above the percentage value.
Listen for a buzzing sound to indicate the rudder servo is
stalling, and hit the DATA -Decrease button until the buzzing
stops. If the servo is not buzzing, leave the setting at 100%.
You may wish to increase or decrease this number
depending on how strongly the model reacts when the
rudder is deflected.
2) Now move the stick to the left side, and repeat the setting
procedure for left rudder.
Flap (or landing gear) end points
In the same manner as described above, set EPA values for
channel 5 (landing gear or flaps) if your model has these
functions.
!
Tip
Flight control surface travel should be published in
the manual for your specific model.
Many model manufacturers will often publish two values,
one for full rates, and one for a diminished dual rates settings.
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