Exponentials; End Point Adjustments - FUTABA 6EXA Instruction Manual

Dual Rate Settings
To set the dual rates:
1. Enter the programming mode. Access the D/R screen with the MODE key.
2. Select the channel to be adjusted (1-aileron, 2-elevator) by pressing the SELECT key until the
desired channel number appears on the screen. Note: If a + or a
number, you have pressed the SELECT key too many times and displayed the values for the
exponentials (explained later). Press the SELECT key to return to the dual rate values.
3. Place the dual rate switch in the desired position for the value you wish to change.
(Generally, pilots prefer to have the switch in the "up" position for the high rate, and in the
"down" position for the low rate.)
4. Change the dual rate value using the DATA INPUT lever until the desired control throw is
achieved. If you wish to change the control throw when the switch is in the other position as
well, flip the switch, then use the DATA INPUT lever to change the throw.
5. Repeat the procedure for the other dual rate (channel 2-elevator).
Exponential Settings
The "exponentials" are in the same function as the dual rates. (Pressing the MODE key will take you to the next function
which is End Point Adjustments). The same as dual rates, "expos" can be set for both switch positions. Negative exponential
(-) decreases initial servo movement. Positive exponential (+) increases initial servo movement. The exponential "curve" may
be set anywhere between -100% and +100%.
To set the exponentials:
1. Enter the programming mode, then select the channel (1-aileron, 2-elevator) you wish to set
by pressing the SELECT key. The active channel number will be displayed on the screen with
a + or a - next to the number (initially, the value will read – 0)
2. Position the dual rate switch where desired for the value you wish to change.
3. Enter the amount of exponential with the DATA INPUT lever. (As stated above, an exponential
value with a "-" in front of it makes the initial servo movement less, or "softer.")
4. Flip the switch to the other position to enter the exponential value for that switch position.
5. Repeat for the settings on the other channel.
E.P.A End Point Adjustment
Note: Since changing the "end points" will also change the dual rates, the end points should be set prior to setting the dual
rates. If you set the dual rates first, and then go back and change the end points, the dual rate throws will also change.
The E.P.A. function is designed to "fine tune" the servo throws in cases where changing the pushrod hookup will not achieve
the correct throw. The pushrods should first be connected to the servo arms and control horns so the correct, or near correct
control surface throw will be achieved. THEN the E.P.A.s may be used to make small changes in the servo throw until the
desired control throw is achieved. The control throws should be set up so that the "end points" are as near to 100% as
possible. If the E.P.A. values must be set below 70% or above 120% to get the desired
throw, you should strongly consider changing the pushrod connections so the values can
be set closer to 100%. (When the E.P.A. is set to 100% the maximum servo throw for
channels 1, 2, 3 & 4 is approximately 40° and approximately 55° for channels 5 & 6.)
To set the end points:
1. Enter the programming mode and use the MODE key to access the E.P.A screen. The channel
number being adjusted will appear on the screen and the % symbol will be flashing.
2. To change the RIGHT aileron throw move the aileron stick to the right, then push the
DATA INPUT lever up or down to change the value and the throw.
3. Move the stick to the left and use the DATA INPUT lever to change the LEFT aileron throw.
4. Use the SELECT key to display the other channels and set the other end points. Notice
that moving the stick (or switch or dial) from one end to the other changes the value
displayed and the position of the arrow for that "end" of the control input.
appears next to the
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