Futaba 4EXA - Manual (Page 11)

11 11
E.P.A End Point Adjustment E.P.A End Point Adjustment
The EPA 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 EPAs 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 EPA 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 EPA is set to 100% the maximum servo throw for channels 1, 2, 3 & 4 is
approximately 40 ° )
To set the end points: To set the end points:
1. Enter the programming mode and use the MODE key to access the
““EPA EPA”” screen.
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 from one end to the other changes the value displayed and the position of
the arrow for that “ end ” of the control input.
Trim Settings/Trim Memory Function Trim Settings/Trim Memory Function
There are four trim levers ( “ trims ” ) on the front of the transmitter. The intended use of the trims is to make small servo
adjustments, in flight, to get the model properly “ trimmed ” (so it will fly straight-and-level).
Center the servos: Center the servos:
1. Turn on the transmitter and receiver. Operate the controls to make sure the servos respond in the correct direction. Use the
reversing function to reverse any servos necessary.
2. Center the throttle control stick.
3. Place the servo arms on the servos so they are perpendicular to the pushrods (see page 5). It is okay to cut off any unused
servo arms.
4. Connect the pushrods to the control surfaces. Adjust the length of the pushrods until the control surfaces are centered
when the servos are centered.
To adjust the trim settings: To adjust the trim settings:
Once the servos and control surfaces have been connected and the control throws have been set using the end points, get
the model airborne. Adjust the trims as necessary to get the model to fly straight-and-level. If much trim is required on any
one control it is a good idea to readjust the pushrods so the trims can be returned to neutral (zero).
TRIM.M - Trim memory function TRIM.M - Trim memory function
Since the trims on the 4EX are “mechanical” trim, before changing the model number or turning off the transmitter, perform
trim memory operation to save the trim position. The trim positions at the last operation are recalled by opereting the trim
lever to center.
To save all trim positions: To save all trim positions:
1. Enter the programming mode and use the MODE key to activate the TRIM.M menu.
2. Push the DATA INPUT lever upward or downward for about one second to save all trim
positions.
EXP Exponential Settings EXP Exponential Settings
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: To set the exponentials:
1. Enter the programming mode. Access the
““EXP EXP““ screen with the MODE key.
2. Select the channel (1-aileron, 2-elevator, 4-rudder) you wish to set by pressing the SELECT
key. The active channel number will be displayed on the screen.
3. Enter the amount of exponential with the DATA INPUT lever.
4. Repeat for the settings on the other channel.
Note: Note: Before programming the exponentials, perform trim memory operation and then set the corresponding trims to center.
40-140%
at 100%
1-4ch; 40
°
at 140%
1-4ch; 55
°