Bedienungsanleitung Futaba GYA440 (Seite 2 von 2) (Englisch)

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AVCS 100%

NORMAL 100%NORMAL 50%

LIMIT

GAIN

AVCS 50%

Servo

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Gyro Sensitivity and AVCS Switching

AVCS/NORMAL Modes

Servo Operation on the Ground

Link the servo in accordance with the kit instruction manual.

Adjust the linkage rod so that the trim amount is as small as pos-

sible.

Digital/Analog servo selection

Selection of an analog and digital servo is performed in a limit

trimmer's setting position.

A limit trimmer's motion is as follows.

Digital servo → A trimmer is adjusted by the Right rotation from

the middle point.

Analog servo → A trimmer is adjusted by the Left rotation from

the middle point.

The amount of limits -- the halfway point -- the minimum -- it will

become the maximum quantity if it is made to rotate to max, re-

spectively. The check of operational mode is discriminable in the

display color of LED. The stability of digital-servo mode of a ﬂight

increases in order to perform a high-speed control action.

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Adjust the gyro sensitivity at the transmitter.

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Use the Elevator/Rudder selector switch to select elevator or

rudder. (Elevator: ELE Rudder: RUD)

Turn on your transmitter's power. Set the gyro sensitivity to about

30% at the normal side (minus rate side) in accordance with the

transmitter instruction manual. 30% of normal sensitivity will be about

-60% at the rate of the sensitivity CH so that a next graph may be seen

and understood.

Turn on the receiver power. When the gyro starts, the LED ﬂashes

green and initialization begins. When initialization ends, the

servo performs reciprocating operation to the left and right. (a little)

This places the gyro into the ready state. During initialization, secure

the fuselage so that it will not move and fix the transmitter stick at

the neutral position. Initialization takes about 3-5 seconds after the

receiver operates. After initialization, the LED lights green/orange. If

the neutral position has changed, the LED will slowly blink orange.

In this case, restart the gyro. Move the stick and check that the servo

operates

Move the stick to the maximum left and right. Adjust the gyro

limit trimmer so that the servo operating angle is at the maximum

position at which there is no interference with the linkage.

Adjust the transmitter and gyro while repeatedly taking oﬀ and

landing and with the aircraft on the ground.

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because it is dangerous.

Fly the aircraft and trim it by turning oﬀ the gyro at 0% sensitivity

or in the NORMAL mode. After trimming, switch the gain switch

between 0% sensitivity (or NORMAL mode) and the AVCS mode three

times at an interval of within one second and then set the gain switch

to the AVCS mode position. This memorizes the AVCS mode neutral

trim position at the gyro. In the AVCS mode, do not perform trimming

during ﬂight.

Adjust the gyro sensitivity so that hunting (deflection of the

aircraft in small increments) does not occur in the control axis

The gyro has two operation modes: NORMAL mode and AVCS

mode. In the AVCS mode, angle control is performed at the same

time as NORMAL mode rate (rotating speed) control. In the AVCS

mode, the neutral keeping force is stronger than the NORMAL

mode and the flight attitude of the aircraft is forcefully main-

tained. During knife-edge flying, idiosyncrasies of the aircraft

when climbing will be compensated automatically. On the other

hand since the rudder follows when the aircraft stalls, pay spe-

cial attention to the elevator axis. To be safe, switching to the

NORMAL mode when taking oﬀ and landing is recommended.

If the stick is moved when the airplane is on the ground, the ser-

vo will move to the limit position. In the AVCS mode, the servo

will not return to the neutral position even if the stick is set to

the neutral position, but this is normal.

If the stick is moved fully to the left or right three or more times

within one second, the servo will temporarily return to the neu-

tral position.

When the remote gain function is used normally and AVCS

mode switching is performed in accordance with the direction of

operation of the transmitter's remote gain channel. At the + rate

side, the AVCS mode is selected and at the ‒ rate side, the NOR-

MAL mode is selected. The sensitivity is changed by adjusting

the end point rate. If the transmitter has a gyro sensitivity set-

ting mixing function, the sensitivity setting is performed directly.

When the remote gain function is not used, the clockwise di-

rection from the center of the sensitivity setting trimmer is the

AVCS mode (not used) and the counterclockwise direction is the

NORMAL mode. At the center position, the sensitivity becomes

zero. When the trimmer is turned fully to the left or right, the

sensitivity becomes 100%.

The sensitivity setting criteria by end point is shown in the

ﬁgure below. The sensitivity becomes zero between end point

-40% to +40% and becomes 100% at end point 100%.

Refer to the transmitter instruction manual and set the end

point. When AVCS is used, setting the 3-positions switch to the

sensitivity CH (there are types which cannot be set by transmit-

ter) and setting it as shown above is recommended. In the case

of a 2-positions switch, inhibiting the gyro at 0% sensitivity such

as NORMAL mode and sensitivity 0% and AVCS mode and 0%

sensitivity is safe.

Trimmer movement when the

remote gain function is not used

(when S.BUS is not used and port

2 is not connected) . Please do

not use AVCS, when you do not

use remote gain. Because, neutral

memory cannot be performed.

And taking off and landing being

dangerous.

-40%

+40%

50%

100%

+70% +100%

-70%-100%

End point rate

Gain

NORMAL side（LED : GREEN）

AVCS side（LED : RED）

GAIN 0％

AVCS

NORMAL

When AVCS is used we

recommend that the

sensitivity CH be set to

the 3-position.

AVCS 100%

NORMAL 100%NORMAL 50%

LIMIT

GAIN

AVCS 50%

Tilt the airplane to the left on

the ground and check that the

rudder operate to the right. (In

the case of rudder control)

Tilt the airplane to the

up on the ground and

check that the elevator

operate to the down.

(In the case of elevator

control)

When GYA440 used at the rudder of airplane

In AVCS operation

Mode

In NORMAL operation

Mode

NORMAL in a cross

wind.

The tail will drift.

AVCS is working

properly during

a cross wind.

If it starts rightward

A head turns to a

direction of movement

automatically.

If no left rudder input

is given, the machine

will drift to the right.

Cross

wind

Cross

wind

Cross

wind

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Adjust the gyro sensitivity with the GYA440 trimmer.

Do not use the AVCS mode.

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In this case,

gain setup with a transmitter and

limit adjustment

of diﬀering in a procedure are lost. And as shown in a ﬁgure, gain is

adjusted of the trimmer of GYA440.

＜Limit trimmer Adjustments＞

It adjusts to the

maximum operation of

linkage.

（

Elevator

）

Elevator stick up

/down to full

D/R (UP side)

LIMIT

GAIN

Limit trimmer

Adjustments

Digital

Analog

In the case of rudder control, move the gyro direction switch and

adjust the direction of operation of the gyro so that the rudder

move all the way to the right when the airplane is turned to the left. In

the case of elevator control, move the gyro direction switch and adjust

the direction of operation of the gyro so that the elevator servo moves

in the down direction when the airplane is moved in the up direction.

If the direction of operation of the gyro is incorrect, ﬂight will become

impossible, so please make sure the settings are correct.

Gyro sensitivity zero --- LED OFF

AVCS side --- LED red

NORMAL side --- LED green

LIMIT

GAIN

NORMAL 30%

＜

A gain trimmer's work

＞

First, we recommend to

start with NORMAL 30%.

＜

GAIN CH

＞

LIMIT

GAIN

Digital-servo mode:

LED Orange

Limit position

of digital servo

Limit position

of analog servo

[Limit position]

Selection of digital /analog servo

is chosen towards a trimmer turning.

LIMIT

GAIN

70%

100%

130%

Analog-servo mode:

LED Green

When a remote gain function is oﬀ, it becomes only analog servo

mode. A trimmer becomes only for gain.

(Digital-servo use is possible)

*When you use an analog servo, please be sure to set to ana-

log servo mode. If it sets to digital-servo mode and it is op-

erated, there is a danger that a servo will be destroyed.

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direction. The gyro sensitivity is different depending on the area of

the aircraft rudder, air speed, and gyro used. Initially try changing

the sensitivity in 5% steps. If hunting is excessive, the aircraft may be

damaged. Hunting tends to stop when the airspeed is lowered.

● Trimmer operation

*Make trimmer adjust-

ments gently by using the

included mini screwdriver.

Futaba GYA440 Seite 2

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