Manual Robbe Futaba FX-40 (page 76 of 105) (English)

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Model menu

Trim Mix 1 and 2

FX-40

increments) corresponds to a duration of nine seconds. The

default setting is always ‘0’. When you mark one of the

fields ‘there’ or ‘back’, the button fields for the arrows

appear at the right margin.

The servo speed mode can also be defined in the centre

field: the two options are linear and symmetrical modes.

Linear mode is used for controlling the throttle servo and for

switches; this mode is not self-neutralising. The alternative

(symmetrical) mode is self-neutralising, and is therefore the

default setting for all control surfaces.

This screen shot shows the results of programming an

exponential mixer curve for the ‘Butterfly’ option.

• Assigning a trim compensation mixer

Deploying a Butterfly braking system generally causes a

nose-up or nose-down pitch trim change, i.e. a lateral axis

trim corr

ection is r

equired. In the final sub-menu you can

select a suitable elevator travel to compensate for the

unwanted pitch change. The mixer rates and the curve can

be set up and adjusted using the method which should be

familiar by now.

The same technique is also employed for adjusting the tran-

sit speed of the elevator servos.

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.

18.12 TRIM MIX 1 AND 2

This menu is

used to set up

mixers which

apply to all the

wing contr

urfaces and

the elevators,

separately for

particular flight

phases. The

software of the

FX-40 provides

two flight phase

mixers (Trim Mix

1 and 2), but

both mixers are

programmed in

exactly the same way, so this Section only describes the set-

up procedure for the first mixer.

A typical application would be for a model glider, with Trim Mix

1 set up to provide the optimum control surface settings for

the winch launch phase of the flight. These settings would

lower the ailerons and the flaps in order to give the model

maximum possible lift on the winch line. To ensure a stable

pitch attitude on tow, the mixer includes an option for entering

an elevator Offset to provide pitch trim compensation (i.e.

around the lateral axis).

In our example the second mixer (Trim Mix 2) might be used to

set up the optimum control surface settings for the speed

phase of the flight, with ailerons and flaps raised slightly in

order to minimise the aircraft’s drag.

These options are designed to ensure that reliable, reproduci-

ble control surface travels can be recalled again and again

when you select these flight phases. The settings can be cal-

led up using any switch you like.

An Offset can be entered for each of the wing control surfaces

- up to four ailerons and four flaps - in order to fine-tune the

individual wing flap neutral positions. You can also assign one

of the auxiliary transmitter controls for fine-tuning the system.

This allows you to set up a pre-set position for all the control

surfaces prior to fine-tuning in flight. As with all mixers, you

can select ‘Glob’ or ‘Sepa’ mode as desired.

You can also define a trigger switch which activates the set-

tings for the flight phase. At the same time you can determine

whether the function is triggered by a switch (manual mode) or

by a transmitter stick (automatic mode). Naturally, your prefer-

red stick can be selected individually.

It is possible to set the required transit speed individually for

the aileron servos, flap servos and elevator servos, with sepa-

rate settings for the ‘there’ and ‘back’ directions. If you wish,

you can program a delay time for this mixer function, so that

the transition is smooth rather than abrupt.

Start by marking the desired option ‘Trim Mix 1’ or ‘Trim Mix 2’

in the Model menu. The screen display for the ‘Trim Mix 1’

option now looks like this:

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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