Manual Robbe Futaba FX-40 (page 64 of 105) (English)

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Model menu

Mixture adjustment

FX-40

17.4 MIXTURE ADJUSTMENT

(power model and helicopter model types only)

This function is designed for fine-tuning the fuel mixture at the

carbur

ettor using a separate servo. A special advantage of this

system is the ability to set up an inter

-action with the normal

throttle function. If you activate this option, the needle valve

follows the operation of the throttle servo when you open or

close the throttle, ensuring a reliable motor run when properly

set up. A curve for optimum adjustment of the mixture control

can also be programmed for this linked function. A supple-

mentary acceleration function is also available, ensuring that

the motor picks up speed quickly when you open the throttle.

Mark the ‘Mixture adj.’ option in the Model menu. The screen

display will then look approximately like this:

Please observe the programming procedure described below:

• Activate the option

The automatic mixture control function must first be activa-

ted by marking the Status field. The display then changes

from ‘INA

’ (inactive) to ‘ON’, and the option is activated.

•

Define the mode

As with many other functions, you can define whether the

‘Mixture adjustment’ option is to apply globally (all flight

modes), or separately, i.e. just to the curr

ent flight mode.

Use the ‘Mode’ button field to change this setting; in each

case the setting is shown in graphic form.

•

Program the curve

First select the (MIX / UNMIX) mixer type. Mark the field in

the appr

opriate line, and the mixer type changes accor

din-

gly. If you select ‘MIX’, the Master data is derived from the

throttle curve you have already programmed. If you opt for

‘UNMIX’, the Master data varies directly according to the

current position of the throttle stick.

The curve is programmed in the first menu level using the

now familiar procedure. The first step is to define the curve

type: mark the appropriate field and select your preference

from the usual array of six curve types. The values are

adjusted exactly as described for programming the Dual

Rate curves. Please refer to this in Section 17.2 on page 58.

• Set the trim adjustment mode

The menu features a second level in which you can set the

trim adjustment mode, pr

ogram an acceleration function,

and select settings for particular thr

ottle states. This sub-

menu is accessed by marking the ‘Trim, Acceleration’ but-

ton field in the bottom left corner. The display changes, and

looks similar to the following:

Two adjustment ranges (centre and max.) are available.

‘Max Trim’ works like an ATL trim; it affects the upper

adjustment range only. In each case you can enter a setting

as a percentage value for both ranges, using the familiar

method.

Next you have to select the transmitter control or switch

which is to be used to alter the value. The default setting is

‘NONE’, i.e. the function is permanently switched on. Mark

the field, and the screen displays the switch select menu.

Select your preferred switch using the standard method.

The trim mode can now be changed if desired; two types

are available:

CTRM = Centre Trim: this trim function works around the

centr

e position of the transmitter contr

ol, without affecting

the end-points.

NORM = Normal Trim: the trim range lies symmetrically

ound the centr

e. The selected (fixed) trim range shifts

around the centre, i.e. the servo end-points are also affec-

ted.

Finally, you can define a working range for this option: mark

the appropriate field, and the arrow buttons appear at the

right margin of the screen. The range can be defined within

the limits 0% to 100%; the default setting is 100%. Pres-

sing the ‘Reset’ field restores the default setting.

• Set the acceleration function

The centre frame is used for this step in programming.

When the thr

ottle is advanced, the needle valve is opened

in or

der to set a slightly richer mixture; this improves the

motor’s ability to pick up speed. The process is identical to

that already described several times in these instructions:

mark the fields in which changes are to be made, and enter

the new values using the arrow buttons.

The adjustment range is 0% to 100%. When the throttle is

opened, the needle valve servo runs to the set position. At a

setting of 0% the servo runs in parallel with the throttle

servo; at 100% it precedes it by about 10 - 15° before

moving to the set value. The defaults for this option are 0%.

Pressing the ‘Reset’ button restores the default settings.

The acceleration function can be damped, so that the

needle valve setting does not change abruptly to a richer

mixture. This is achieved by marking the appropriate field;

the arrow buttons then appear at the right margin of the

screen. The range can be defined within the limits 0% to

100%; the default is 0%. Pressing the ‘Reset’ field restores

the default setting.

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Robbe Futaba FX-40 Manual

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