Bedienungsanleitung Robbe Futaba FX-40 (Seite 66 von 105) (Englisch)

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Model menu

Aileron differential

FX-40

18.1 AILERON DIFFERENTIAL

Differential aileron travel is often required on fixed-wing model

air

craft in order to compensate for the phenomenon known as

adverse yaw. When the aeroplane is turning, the outboard

wing moves through the air more quickly, which means that

the drag generated by the down-going aileron (on the outside

of the turn) is greater than that of the up-going aileron. The

result is a yawing moment which tends to turn the model’s

nose away from the turn, swinging the model around its verti-

cal axis.

The effect of aileron differential is to reduce the travel of the

down-going aileron relative to that of the up-going aileron, with

the aim of generating equal amounts of drag on both wing

panels. This eliminates the adverse yaw problem.

This function acts as a mixer for two separate aileron servos,

enabling you to adjust travels for ‘aileron up’ and ‘aileron

down’ individually for each aileron. One of the auxiliary trans-

mitter controls can be set up as a means of fine-tuning the

degree of differential.

A separate

servo must be

used for each

control surface.

The FX-40 soft-

ware allows

you to assign

transmitter

controls in any

way you like.

The diagram above shows a typical fixed-wing model with two

ailerons on each wing panel.

Mark the ‘Aileron diff.’ option in the Model menu. The screen

now looks like this:

In our example the programming procedure is described for a

model with ‘only’ two aileron servos. Nevertheless, if you need

to activate this option for a complex model glider with up to

four ailerons, the set-up procedure is more or less identical.

Please follow the programming procedure described below:

• Define the basic settings

In the ‘Glob’ field you can select ‘Sepa’ or ‘Glob’ modes;

the ef

fect has alr

eady been described, and is set using the

standard method.

Press the ‘Master’ field in the top right corner of the screen

to move on to the AFR and D/R settings for the ailerons.

The screen now looks like this:

The first step is to set the display mode in the ‘Display’ field;

you can define individually whether the screen is to show all

the flight modes (All modes), the currently active mode

(Separate) or the ‘AFR’ and ‘D/R’ settings.

The ‘Speed’ frame is used for adjusting servo transit speed.

You can enter a speed separately for the ‘there’ and ‘back’

directions, and the adjustment range is 0 to 27 increments.

Please note: the higher the number, the more slowly the

servo moves. The maximum value (27 increments) corres-

ponds to a duration of nine seconds. The default setting is

always ‘0’. When you mark one of the fields ‘there’ or

‘back’, the arrow button fields appear at the right margin. It

is possible to make adjustments in steps of one or ten

increments. Pressing the ‘Reset’ button restores the default

setting.

Pressing the ‘D/R’ button field displays the current Dual

Rate settings. Dual Rate values can be set at this point, in

parallel with the programming facilities which are described

in Section 17.2 on page 57.

• Enter the dif

fer

ential travels

For the aileron servos (max. four) mark the appropriate

adjustment field for the left and right side. The arrow but-

tons are used to enter adjustments; note that you have to

move the stick to the right or left end-point in each case.

Adjustments can only be carried out for the side to which

the stick has been moved.

•

Set up a curve

It is possible to program a curve for the effect of the aileron

dif

fer

ential function. A percentage value can be entered in

addition to your preferred curve type for each side (Rate A

and Rate B). The values are adjusted exactly as described

for programming the Dual Rate curves; please refer to this

in Section 17.2 on page 58.

No differential

50% differential

100% differential (split mode)

Aileron 1

Aileron 3

Aileron 4

Aileron 2

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