Manual Robbe Futaba FX-40 (page 72 of 105) (English)

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Model menu

Spoilers

FX-40

18.8 SPOILER (FLAP) MIXER

This menu is

used for setting

up a mixer

which causes

all the wing

flaps to be

lower

ed to

incr

ease wing

camber and

thereby maxi-

mise lift.

The travels for

all the control

surfaces can be

set in the ‘up’ or

‘down’ direc-

tion, to ensure that the mixer can generate the optimum wing

geometry for all flight tasks. The servo travels and directions of

rotation can be set accurately using a mixer curve. It is also

possible to program a delay time, define the servo transit

speed and select a mixer trigger switch.

Mark the ‘Spoiler’ option in the Model menu. The screen now

looks like this:

The adjustment facilities are extremely comprehensive, but

they are arranged in just as logical a manner as all the other

menus described up to this point.

As you would expect, this mixer function first has to be activa-

ted 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 in the second line.

Use the familiar method to define a switch for triggering the

mixer: mark the appropriate field and define the switch and its

direction of operation in the switch select menu which now

appears. The default is ‘NONE’, i.e. the mixer is constantly

switched on.

You can program a delay time for each channel, so that there

is a smooth transition when you switch modes, rather than an

abrupt change. The first step here is to mark the ‘flight mode

delay’ line. You can now enter a setting using the arrow but-

tons. The adjustment range is 0 to 27 increments; the higher

the number, the longer the delay time. The maximum delay

time (27 increments) corresponds to a duration of nine

seconds. It is possible to assign a special switch which can be

used to turn the delay off for particular situations. This is effec-

ted by defining a switch in the bottom line.

In the second frame the AFR settings are entered for the cam-

ber-changing flap mixer. This sub-menu is accessed by mar-

king the ‘Spoiler AFR’ field; the screen display now looks like

this:

The AFR curve is programmed exactly as described in Section

17.2 on page 57.

The mixer curves can be set up and the servo travels entered

individually for the ailerons, the spoiler flaps, the brake flaps

and also for the elevators. Mark the appropriate line in the

separate ‘Curve and rate’ field. In each case a new display

appears in which you can program the mixer curve in the usual

manner, working separately for the left and right sides of the

curve. An ‘Offset’ and / or an ‘X-offset’ curve shift can be

implemented in the usual manner.

In a separate frame, the servo travels can be entered individu-

ally as percentage values, e.g. for all four aileron servos. In the

same display the servo transit speed can also be pro-

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

‘back’ directions. 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) corresponds to a

duration of nine seconds. The arrow buttons are used to make

any adjustments. The default value is always ‘0’. Pressing the

‘Reset’ button restores the default setting.

The screen shows a typical display relating to this program-

ming procedure.

Finally, 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.

Tip aileron

(AIL3)

Main

aileron

(AIL)

Spoiler

(FLAP)

Spoiler

(FLAP2)

Brake flaps

(BRFL & BRFL2)

Main

aileron

(AIL2)

Tip

aileron

(AIL3)

V-tail Ailvator

ELE

ELE2

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Robbe Futaba FX-40 Manual

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