Manual Robbe Futaba FX-40 (page 49 of 105) (English)

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FX-40

16.14 SWASHPLATE

BASIC SWASHPLATE SETTINGS

This function is used to program the mixer functions required

to actuate the swashplate of a model helicopter

. It is not avai-

able if you select the swashplate type SWH1, as no mixers are

required for the collective pitch function with this configura-

tion.

If you activate a model helicopter with any of the other swash-

plate types, you can access this menu to set and reverse the

stick travels of the roll (aileron), pitch-axis (elevator) and col-

lective pitch functions. The essential mixer functions can also

be programmed at this point.

Mark the ‘Swashplate’ option in the base menu. The screen

now looks like this:

The software of the FX-40 provides a very convenient method

of optimising the swashplate settings.

• Neutral point adjustment

The first step is to optimise the neutral point setting, which

is enter

ed as a per

centage value. First adjust the servo out-

put arms mechanically, so that the neutral point is close to

50%. Now mark the ‘Sel.’ (select) field, and its background

will turn red. Adjust the position of the collective pitch stick

until the servo output arms are exactly at 90° to the push-

rods. Now press the ‘Sel.’ field again, and read off the dis-

played percentage value; this figure is also displayed in bar

form.

• Adjusting stick travel

The stick travel settings can be optimised for the roll, pitch-

axis and collective pitch functions: mark the field in the

swashplate frame, and enter the r

equir

ed percentage value

using the arrow buttons which now appear. The adjustment

range is -100% to +100%; the default setting is 50%.

Pressing the “Reset” field restores the default setting.

You should now use the servo reverse function to correct

the direction of servo rotation where necessary, so that all

the servos move in the same direction when you operate

the collective pitch stick. With these settings correct, set

the appropriate direction of rotation for the pitch-axis and

roll functions by changing the + / - prefix where necessary.

It is important to set the control travels to the largest possi-

ble value without the pushrods or servos striking their end-

stops. Check the maximum control travels carefully when

the collective pitch, roll and pitch-axis functions are at their

extremes of travel. Remember that the swashplate may jam

if you set excessive travels, although this varies according

to the method of actuation and the design of the rotor head.

The swashplate menu has two display levels; pressing the field

at top right takes you to the second level: Swashplate (AFR).

The display changes, and the screen for setting up the mixer

rates appears. It looks like this:

• Setting the mixer rates

Example of an HR-3 120° swashplate type with electronic

mixing (ECCPM).

The purpose of adjusting the mixer rates is to obtain even

mixing (as far as possible) of the thr

ee swashplate servos

which ar

e responsible for the control functions roll, pitch-

axis and collective pitch.

• Linkage compensation

Any unwanted interactions between the various pushrods

can be corr

ected in the right frame on the second scr

een

page.

• Speed compensation

The two roll servos feature shorter control travel at the

swashplate, which can result in an unwanted collective

pitch response when a pitch-axis command is given. At this

point you can set a delay for the roll servos to prevent this

happening.

A detailed description of the swashplate mixer set-up pro-

cedur

e can be found in Part 2 of the “Model Helicopter

Menu” instructions. See Section 19.5 ‘Swashplate mixers’

on page 90.

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