Manual Robbe Futaba FX-40 (page 92 of 105) (English)

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Model menu

Swashplate mixer

FX-40

The correct settings can then be set while you are still in the

‘Swashplate AFR’ menu.

NOTE:

While you are carrying out this set-up procedure it is absolu-

tely essential that the ball-end bolts on the inner ring of the

swashplate line up very accurately with the ball-end bolts on

the outer ring of the swashplate. If not, you will get a pitch-axis

fect when you give a r

oll command, and vice versa. Accurate

adjustment is required to eliminate this potential problem.

Adjust the servo travels in such a way that the swashplate

remains exactly at right-angles to the rotor mast over the full

range of collective pitch travel. Check carefully that there are

no superimposed cyclic pitch deviations when you move the

collective stick.

In the base menu mark the ‘Swashplate’ option, then mark the

‘Swashplate detail’ button field in the top right corner.

In the ‘Mix rate’ frame the first two mixers are ‘Collective pitch

-> roll’ and ‘Collective pitch -> pitch-axis’. The purpose of

these two mixers is to align the swashplate correctly at both

ends of collective pitch travel. When you move the collective

pitch stick, you will see that the marking of the input fields

changes. To alter a value, click on an input field in the marked

line, and use the arrow buttons at the right margin of the

screen to change the value. Move the collective pitch stick to

maximum collective, and look at the swashplate from the front:

adjust the ‘Collective pitch -> roll’ mixer until the swashplate is

exactly horizontal.

Now move the collective pitch stick to minimum collective,

and repeat the adjustment as described above. For this proce-

dure It is advisable to use a collective pitch gauge set to 0°,

and attach it to one flybar paddle. You can use the top edge of

the rotor head as reference line. This arrangement will enable

you to pick up even the slightest unwanted movement in the

swashplate. Now rotate the rotor head through 90° so that you

see the flybar paddle and the collective pitch gauge from the

side of the model. Adjust the ‘Collective pitch -> pitch-axis’

mixer until the swashplate is accurately aligned at minimum

and maximum collective pitch.

The purpose of the remaining three mixers is to prevent

unwanted interactions at the swashplate when the collective

pitch stick is at 50% or centre. The ‘Roll -> collective pitch’

mixer should be set up in such a way that the swashplate

remains horizontal when viewed from the side with full roll to

right or left applied. The next stage is to set up the ‘Pitch-axis

-> roll’ and ‘Pitch-axis -> collective pitch’ mixers; this time the

swashplate must remain horizontal when viewed from the front

when full forward and back cyclic (pitch-axis) commands are

given.

The next step is to set the linkage compensation: this setting

compensates for interactions at the swashplate towards the

extremes of collective pitch travel. In each case there are four

adjustment facilities for high and low collective pitch values.

View the swashplate from the side while you move the collec-

tive pitch stick to max. collective, and set a value for the ‘Roll

mixer’ to eliminate any change in the pitch-axis travel at full

right or left roll travel. When you are satisfied, rotate the rotor

through 90° and adjust the ‘Pitch-axis mixer’ in the same way.

The final stage is to repeat the whole procedure with collective

pitch set to minimum.

Speed compensation can now be applied. The purpose of this

setting, which is only provided for 120° ECCPM swashplates, is

to compensate for mechanical differences between the roll and

collective pitch servos; when operated together in response to

a pitch-axis command, they operate faster than the single

pitch-axis servo. This problem can usually only be picked up if

you move the pitch-axis stick from one extreme to the other at

high speed. Adjust the speed compensation value so that the

ball-link in the centre of the swashplate does not jump up and

down when the pitch-axis stick is moved quickly.

The screen shot above shows a typical programming example

with a speed compensation value selected.

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Robbe Futaba FX-40 Manual

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