4Yf-2.4Ghz Functions; Servo Reversing; Trim Settings; Elevon Mixing - FUTABA 4YF-2.4GHZ Instruction Manual

4-channel, fhss radio control system for airplanes

Table of Contents

Servo Reversing

The servo reverse switches are used to change the direction that a servo responds to a control input from the transmitter (each

stick). After using the reversing function, check all the controls on the model to be certain they are operating in the correct

direction and that you did not inadvertently reverse a servo other than the one intended. Reversing the wrong servo (and not

checking the response of the controls before each ﬂight) may be the most common cause of a crash!

*Note that the direction of the aileron servo is easily mistaken.

Trim Settings

There are four trim levers ("trims") on the front of the transmitter. These trims are for adjusting the neutral position of the

aileron, elevator and rudder servos and for setting the idle r.p.m. of the engine when the throttle stick is all the way down.

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). Simply push or pull on the trim levers while ﬂying and the neutral position of the servos will shift. Keep in

mind that you should start out with the control surfaces centered when the servos are centered and the trims are "zeroed" (or

near zero).

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 control stick.

3. Place the servo arms on the servos so they are perpendicular to the pushrods (see page 10). 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:

Once the servos and control surfaces have been connected and the control throws have been set by changing the servo horn

and each control surface horn rod, 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).

Elevon Mixing

Intended for tailless, "flying wing" models such as delta wings and flying wings, elevon mixing mixes channel 1 (aileron)

to channel 2 (elevator) allowing the elevons to operate in unison (as elevators) or in opposition (as ailerons). This function

requires that each elevon be operated by a separate servo.

* If necessary, use the Servo Reversing function to achieve the correct direction of servo throws.

To Activate Elevon Mixing:

1. Remove the battery cover from the transmitter by sliding it.

2. Remove the leftmost battery.

3. Switch the Elevon Mixing switch to upper side.

* Use the miniature screwdriver supplied and operate the Elevon Mixing switch

so that excessive force is not applied.