Manual Robbe Futaba FX-40 (page 85 of 105) (English)

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Model menu

Collective pitch curve

FX-40

19.1 COLLECTIVE PITCH CURVE SETTINGS

Operating the collective pitch stick moves the collective pitch

servo or servos, but also automatically operates the throttle

servo. The match between collective pitch and thr

ottle is very

important, and for this purpose the collective pitch function can

be assigned one of six possible curve types, each of which can

be allocated a maximum of seventeen variable points. The FX-40

also offers switchable flight modes which enable the pilot to set

up the optimum collective pitch curve for each flight mode indivi-

dually.

As soon as you select a Helicopter as the model type, the scree-

n’s basic display changes: the second stopwatch (Timer2) disap-

pears, and its place is taken by the current throttle and collective

pitch settings, reflecting the actual position of the throttle / col-

lective pitch stick. This means that you always have this impor-

tant information right in front of your eyes. The screen shot below

shows just such a display.

To move to the collective pitch curve set-up screen, mark this

option in the Model menu (‘Helicopter’ type already selected).

The screen now looks like this:

While you are programming a collective pitch curve, you may find

it helpful to display the collective pitch values as angles instead

of percentage figures. You can make this change by marking the

‘Unit’ field; the currently selected unit is always displayed in this

field. Mark this point, and the screen looks like this:

For the model helicopter application, the throttle and collective

pitch functions are always intimately connected. It therefore

makes obvious sense to have direct access to the throttle

function from the collective pitch curve set-up screen. You can

switch to AFR programming for the throttle function by mar-

king the appropriate field in the first line; the active display

always has a red background. It is possible to determine whet-

her the settings are to apply to all flight modes (Glob) or only to

the currently active flight mode (Sepa) using the ‘Glob’ or

‘Sepa’ button field. The change takes place when you confirm

the security query.

• Programming collective pitch curves

This menu is used for setting up the collective pitch curves

in the following flight modes:

Normal: for starting and stopping the motor

Idle-up 1: for hovering

Idle-up 2: for circuits

Idle-up 3: for aerobatics

Auto-r

otation: for auto-rotation landings

Flight modes 6 - 8: for any other purpose

If you wish to set up differ

ent collective pitch curves, you must

first switch from group mode (Glob) to individual flight mode

(Sepa). You can switch between these two curves (flight

modes) by operating the switch (flight mode switch) assigned

to that mode (see Section 17.1, page 55). When you switch the

transmitter on, the Normal flight mode must be selected; if not,

the mixer alarm sounds. The RF section can only be switched

on in ‘Normal’ mode.

Collective pitch curves are programmed using the familiar pro-

cedure. First you have to define the curve type: five curve

types are available via the corresponding fields, in addition to

the standard linear curve. The values are adjusted exactly as

described for programming the Dual Rate curves; please refer

to this in Section 17.2 on page 58.

This shows a typi-

cal collective pitch

curve for the

‘NORMAL’ flight

mode; the base

curve is a linear

type. The curve

should be pro-

grammed in such

a way that motor

speed remains as nearly constant as possible over the full

range of collective pitch travel . For most applications a five-

point curve is sufficient for this purpose.

A typical curve for

the ‘Idle-up 1’

flight mode; the

base curve is a

linear type. In this

case the values

are optimised for

the hover, so that

the motor main-

tains the correct

speed for all collective pitch settings. For most applications a

three-point curve is sufficient.

A typical curve for

the ‘Idle-up 3’

flight mode; the

base curve is a

linear type. In this

case the values

are optimised for

aerobatics, so that

the motor main-

tains the correct

speed for all collective pitch settings. For most applications a

three-point curve is sufficient.

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Robbe Futaba FX-40 Manual

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