Manual Robbe Futaba FX-40 (page 82 of 105) (English)

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Model menu

Rudder -> elevator

Snap roll

FX-40

18.19 SNAP ROLL FUNCTION

The snap roll function enables you to define transmitter control

positions which cause the aeroplane to carry out a particular

flight manoeuvr

e. The model then flies this manoeuvre when

you operate a switch. The servo settings cannot be overridden

while the switch is in the ‘ON’ position.

For each flight manoeuvre it is possible to define four settings

(right / up; right / down; left / up; left / down) for each of the

three primary control surfaces (aileron, elevator and rudder). A

mode (Central or Separate) can also be defined, which deter-

mines whether a Master switch or any other switch is to be

used to initiate and conclude the manoeuvre. If you select

Central mode, the trigger switch (Central SW) must also be

defined. It is important to assign a safety switch (Safe SW).

The Master switch is then only active when the ‘safety switch’

is in the ‘ON’ position. The purpose of this precaution is to

ensure that you never trigger the snap roll manoeuvre acciden-

tally.

It is also possible to determine whether the settings are to

apply to all flight modes (Glob) or only to the currently activa-

ted flight mode (Sepa); the familiar procedure is required for

this. A trigger switch can be defined for all four directions of

movement individually. The servo travel can be entered as a

percentage value for all three control surfaces (aileron, elevator

and rudder), separately for each direction of movement.

With the ‘Power model’ type already set, mark the ‘Snap roll’

function in the Model menu. The screen display now looks like

this:

The first step is to define the mode in the first line. If you wish

to use ‘Central’ mode, you must then assign the ‘Central SW’

for activating the function. All the usual transmitter controls

and switches are available for this in the switch select menu.

You should then use the same method to define a safety

switch (Safe SW). Setting global or separate mode concludes

the first part of the programming procedure.

Next you have to define the switches for the individual direc-

tions of movement; the procedure has been described several

times, and must be familiar by now. A separate frame is provi-

ded for programming the control surface travels (i.e. the servo

travels) as percentage values. Mark the appropriate field in the

usual way, and enter the value using the arrow buttons. The

adjustment range is -150% to +150%. The default setting is

100%; pressing the ‘Reset’ button restores this setting.

Please be particularly careful when programming this function,

and take care not to enter any settings which could lead to

uncontrollable flight situations. The following screen shot

shows a typical example of programming for a simple snap roll

manoeuvre.

18.18 RUDDER -> ELEVATOR MIXER

(flying wing models only)

Many flying wings exhibit a tendency to dive slightly when a

rudder command is given, and the purpose of this mixer is to

cause the elevator to deflect up when a rudder command is

given. This function may also be of inter

est to pilots who enjoy

extr

eme 3-D aerobatics.

The mixer rate can be set up accurately using a curve. The

function can be activated by a switch which you can select,

and can be connected to other mixers by setting up a link. 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). An auxiliary transmitter

control can be assigned for fine-tuning the settings.

With the model type ‘Power model’ already defined, mark the

‘Rudder -> elevator’ option in the Model menu. The screen

display now looks like this:

This function is programmed in exactly the same way as the

Rudder -> aileron mixer. For this reason the description here

only covers the essentials; for full details you can refer to Sec-

tion 18.7 on page 70.

The first step, as with all other mixers, is to activate it in the

‘INA’ field in the first line, after which you can define a switch

and its direction of operation in the usual way. You can now set

the ‘Glob’ or ‘Sepa’ mode in the customary manner.

If you wish to link this mixer to another mixer, the appropriate

settings should be entered in the ‘Link’ line. You must first acti-

vate this option, then define the mixer to which a link is to be

created. You can set your preferred display mode in the ‘Dis-

play’ field: (All modes), (Separate) or (Fine).

A separate frame is provided, in which you can enter the set-

tings for the optional fine-tuning facility using the familiar

method.

As previously described, it is possible to set up and program a

mixer curve in the right part of this display level. The mixer

curve you set up at this point defines the effect of the mixer;

i.e. it determines the amount by which the elevator deflects

when a rudder command is given.

The curve values are adjusted exactly as described for pro-

gramming the Dual Rate curves. Please refer to Section 17.2

on page 58.

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Robbe Futaba FX-40 Manual

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