Manual Robbe Futaba FX-40 (page 73 of 105) (English)

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Model menu

Elevator -> flap mixer

FX-40

18.9 ELEVATOR -> SPOILER (FLAP) MIXER

This menu is used for setting up a mixer which causes all the

wing flaps to be lowered or raised to change the wing camber

when an elevator command is given. This amplifies the eleva-

tor ef

fect, and enables the aircraft to turn more tightly and per-

form “square” manoeuvres.

A mixer curve can be programmed for this function, and it can

be activated using a switch which you can select. As with

many functions, it is also possible to determine whether the

settings are to apply to all flight modes (Glob) or only to the

currently activated flight mode (Sepa). You can define an auxi-

liary transmitter control which is used to fine-tune the function.

Mark the button field of this mixer in the Model menu. The

screen now looks like this:

The first step is to activate this mixer function in the Status

line. Mark the field, and the same field then displays ‘ON’ or

‘OFF’ instead of ‘INA’ (inactive), according to the position of

the switch.

The effects and method of setting the ‘Glob’ or ‘Sepa’ mode

have already been described; the function is programmed

using the appropriate switch field.

A switch can be defined to trigger the mixer, using the stan-

dard procedure: mark the appropriate field and define the des-

ired switch and its direction of operation in the switch select

menu which now appears. The default setting is ‘NONE’,

which means that the mixer is permanently switched on.

You can now select your preferred display mode in the ‘Dis-

play’ field: the alternatives are to show all flight modes (All

modes), the currently active mode (Separate) or the fine-tuning

display (Fine).

• Selecting the fine-tuning settings

It is possible to program a transmitter control which is used

to carry out fine adjustments (fine-tuning) of the mixer set-

tings. Changes ar

e enter

ed in the ‘Fine-tuning’ frame. Mark

the appropriate field and select your preferred transmitter

control in the transmitter control / switch select menu which

then appears. The default is ‘NONE’. Any of the auxiliary

transmitter controls can be used. Your selected control is

displayed in the field.

The next step is to define the operating mode for the trans-

mitter control you have chosen; this is carried out using the

now familiar procedure: mark the field containing the sym-

bol for the effect of the transmitter control; the effect mode

changes each time you mark the field. You can choose from

a total of four modes, whose function is displayed in sche-

matic form on-screen. The meaning of the symbols and the

different modes is explained in the description on page 61.

Once you have selected a transmitter control for fine-

tuning, and programmed your preferred mode, you should

determine the effect range for the fine-tuning procedure.

The first step here is to mark the right field in the ‘Fine-

tuning’ frame. The arrow buttons now appear at the right

margin of the screen, and they are used to enter the effect

range as a percentage figure; the set value is displayed in

the appropriate field. The direction of effect can be reversed

if necessary by altering the prefix in the central field.

If you now operate the selected transmitter control, the

function is adjusted within the pre-defined range. The value

currently set is displayed in brackets below the field. At the

same time, a fine line is superimposed on the programmed

curve to indicate the alteration effected by the fine-tuning

process.

• Programming a curve

A curve can be programmed to define the effect of the Ele-

vator -> flap mixer

. In addition to selecting a curve type for

each side (Rate A and Rate B), you can also enter a percen-

tage value. The values are adjusted exactly as described for

programming the Dual Rate curves. Please refer to this in

Section 17.2 on page 58.

The actual settings for the travels of the (max.) four aileron

servos and four flap servos are entered in a separate sub-

menu (see screen shot below).

For each servo the servo travels can be entered separately

for each side of centre in the form of percentage values.

The values are set using the familiar method: mark the field,

confirm it, then set the percentage value using the arrow

buttons.

The screen shot shows a typical example of programming

for this sub-menu.

NOTE:

If you have selected a flying wing in the ‘Model type’ base

menu, two winglets will also appear in the set-up window

for this mixer

. Please enter appr

opriate values at this point if

required.

As a basic rule, please note that the programming options

and the actual appearance of the screen display may vary

slightly according to the model type and wing type you

have selected.

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Robbe Futaba FX-40 Manual

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