Handleiding Futaba GYA441 (pagina 2 van 2) (Engels)

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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 aileron/elevator selector switch to select aileron or

elevator. (Aileron: AIL Elevator: ELE)

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

50% at the normal side (minus rate side) in accordance with the

transmitter instruction manual. 50% of normal sensitivity will be -70%

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).

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

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.

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

NORMAL mode is selected. The sensitivity is changed by adjust-

ing the end point rate. If the transmitter has a gyro sensitivity

setting mixing function, the sensitivity setting is performed di-

rectly.

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 re-

mote gain. Because, neutral memo-

ry 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

ailerons operate to the right. (In

the case of aileron control)

Tilt the airplane to the

left on the ground and

check that the ailerons

operate to the right.

(In the case of aileron

control)

AVCS

When GYA441 used at the ailerons of a shoulder wing aircraft

NORMAL

Left rudder applied

When tilted by left aileron

Flies tilted to the left as long as

right aileron is not applied.

The airplane itself is stable and tries

to return to level ﬂight.

When tilted by left aileron

Left rudder applied

Aileron direction is forcefully

maintained level.

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Aircraft gradually tilts to the left.

<2nd servo operating direction>

During aileron mode operation

the 2nd aileron servo

moves in the

same direction as the

aileron servo. In the elevator

mode, the 2nd elevator servo

moves in the opposite direc-

tion of the elevator servo.

Mount the servos as left and

right objective linkage.

＜Limit trimmer Adjustments＞

It adjusts to the

maximum operation of

linkage.

（

Aileron

）

Aileron stick right

/left to full

D/R (UP side)

LIMIT

GAIN

Limit trimmer

Adjustments

Digital

Analog

In the case of aileron control, switch the gyro direction switch and

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

move all the way to the right when the airplane is tilted to the left.

In the case of elevator control, switch 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 make the settings positively.

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 NORMAL30%.

＜

GAIN CH

＞

LIMIT

GAIN

Digital-servo mode:

LED Orange

Analog-servo mode:

LED Green

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%

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.

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. If the

neutral position has changed, the LED will light 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 and 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.

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Adjust the gyro sensitivity with the GYA441 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 GYA441.

● Trimmer operation

*Make trimmer adjust-

ments gently by using the

included mini screwdriver.

Futaba GYA441 Handleiding

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