Bedienungsanleitung Robbe Futaba FX-40 (Seite 89 von 105) (Englisch)

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Model menu

Throttle curve / Acceleration

FX-40

The ‘Display’ switch field is used to define which of the pro-

grammed throttle curves is to be shown in the graphic display,

or which combination of curves. The options are as follows:

Separate: = Throttle curve for the current flight mode

Fine: = Throttle curve for fine-tuning

All modes: = Thr

ottle curves for all flight modes

Pitch & Thr

ottle: = Collective pitch and throttle curves

The screen shots below show typical graphic displays of these

ptions.

Throttle curve

for fine-tuning

Throttle curves

for all flight

modes

Superimposed

display of col-

lective pitch

and throttle cur-

ves

19.3 ACCELERATION FUNCTION

The purpose of this function is to prevent abrupt changes

affecting the thr

ottle and collective pitch functions when you

change the acceleration setting. The action of the Acceleration

function is as follows: when you alter the throttle setting, a

temporary compensatory effect is superimposed. The result is

that rotor speed does not collapse if you suddenly increase

the blade pitch angle, and rotor speed does not increase if you

suddenly reduce collective pitch. This option has proved to be

extremely useful, in particular for 3-D aerobatic flying.

With the ‘Helicopter’ model type already selected, mark this

option in the Model menu. The screen now looks like this:

You will now find two strictly separated frames for the collec-

tive pitch and throttle settings. In the left frame you enter set-

tings for the collective pitch function, and in the right frame

those for the throttle function. Both settings are entered using

the identical procedure, with the exception that the terms

‘Min.’ and ‘Max.’ in the collective pitch settings frame are

replaced by ‘Closed’ and ‘Open’ in the throttle frame, referring

to the state of the carburettor. The following description there-

fore covers both frames, but we will concentrate on the collec-

tive pitch settings in the following example.

The first step is to activate this option in the standard fashion:

simply mark the Status line in the usual way, and the display

changes from ‘INA’ to ‘ON’. After this you can select ‘Glob’ or

‘Sepa’ mode.

You can now enter a separate percentage value (Rate) for the

positions ‘Min.’ and ‘Max.’, and ‘Closed’ and ‘Open’. Mark the

field and enter the setting using the arrow buttons. The selec-

ted setting is displayed as a percentage value in the field, and

in bar-form in the graphics. You can also enter a percentage

value in the ‘Damping’ field; this determines how long the

function is to remain active once the change in setting has

been carried out. In the bottom line you can define a point for

both sides which represents the position from which the func-

tion is to take effect.

The screen shot shows a typical example of programming the

Acceleration function.

If you decide to set up this facility, please ensure that the

throttle and collective pitch linkages have sufficient freedom of

movement, i.e. that they are not mechanically restricted or

obstructed at any point. If necessary, adjust the mechanical

linkages until this is the case.

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