1M23N30802

Connection

Rate Gyro for Airplanes
Aileron or Elevator use

S.BUS Connection
Extension cord: (Black)

To port 3
To port 1

Aileron/Elevator CH

When there is 1
servo, port 2 is notconnected.

To port 3

Extension cord: (Black)

To port 2

To port 1

To port 2

2nd servo

S.BUS Receiver

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Before using your new gyro, please read this manual thoroughly
and use the gyro properly and safely. After reading this manual,
store it in a safe place.
• No part of this manual may be reproduced in any form without priorpermission.
• The contents of this manual are subject to change without prior notice.
• Futaba is not liable for any potential damage (accidental or otherwise)that may occur after installation.

Features of GYA441

GYA441● Integrated type, compact size and light weight+LJKGHQVLW\PRXQWLQJWHFKQRORJ\PDNHVWKH*<$FRPSDFW [[PP DQGOLJKWZHLJKW J 

Extension cord: (Red)● Supporting the S.BUS/S.BUS2 connection
2QO\RQHZLUHFRQQHFWLRQWRWKHUHFHLYHUFDQRSHUDWHWKH*<$● Port 3 (Aileron/Elevator servo output)● Port 2 (2nd aileron or 2nd
elevator/Gyro sensitivity input)● Port 1 (S.BUS input/
Aileron and elevator
input)● LED

1. No servo pulse /
sensor error

Red

4 ﬂash

2. Start of initialization

Green

Fast blink

5. Neutral deviation

GYA441

Aileron servo

Function

GYA441(aileron)

Aileron

CH1

ElevatorS.BUS/S.BUS2 port

Elevator servo

CH4

2nd aileron
Gyro sensitivity(aileron)
Gyro sensitivity(elevator)
Gyro sensitivity(rudder)Rudder servo

Red/Green/
OrangeSteady
light

Mode

Servo

CH6
CH9
CH5
CH7
CH8

Mounting to the Chassis

Analog servos cannot be used while in "digital servo" mode.

The gyro is very sensitive to vibration. Securely mount it with the included double-sided sponge tape at a position where vibration isminimal and the gyro is perpendicular to the axis to be controlled. Since double-sided tape will not stick to balsa, make a smooth surface by cementing a smooth plastic sheet. to the frame and securely attach the gyro with double-sided tape. Provide a surplus in thewiring and bundle the wiring with the included magic strap so that it will not interfere with the rod.
Sensor tape
Degrease and stick＜ GYA441 aileron mounting ＞
The turning direction which ﬁxes the gyro can be any
direction up to 360° relative to the roll axis.

Aileron control

Do not strike the gyro with a hard object. Do not drop it onto a
concrete surface or other hard ﬂoor.

AVCS

Do not use trims or mixing in AVCS mode.
DigitalAnalogRed

Red

Normal Orange Green
Right (Green)
Red/Green Fast blink
Left (Red)When stick operated
OrangeSlow blink

7. Switch switchingOFF
One blink

8. Low batteryRed

One ﬂash

Each switching
When power drops to 3.8V
or less• In the AVCS mode all corrections are made by the gyro. Therefore, if trimming andmixing, are turned on, operation will be the same as deviating from the neutral position.

Gyro

Do not place gyro near heating equipment (engine, motor, ESC,
battery, servo, etc.).
• Always allow the gyro to adjust to the surrounding environmental temperature beIRUHÀLJKW$ODUJHWHPSHUDWXUHFKDQJHGXULQJXVHZLOOFDXVHGULIWDQGRWKHURSHUDtional issues.

Elevator control

Controlled axis (roll axis)

Do not use the GYA441 for applications other than RC airplanes.
•This gyro is designed for RC airplanes only. Do not use it for other applications.

GYA440(rudder)CH2

2nd elevator

GYA440(Sold separately)

GYA441(elevator)

Rudder$WWHPSWLQJWRÀ\ZLWKWKHRSHUDWLQJGLUHFWLRQUHYHUVHGLVH[WUHPHO\GDQJHURXV$OZD\VFKHFN\RXUJ\UR VGLUHFWLRQWRHQVXUHVDIHÀLJKWVRemarks

CH7

S.BUS connection makes the wiring extremely simple.
The GYA440 and GYA441 can be connected by one
3-way hub. The aileron, elevator, and rudder servos
are output from the gyro. Servos other than S.BUS servos can also be used. When an R6303SB is used the CH
switching mode is set to group 7. The normal group 7
CH outputs are CH3, CH11, and CH12. CH3 is the throttle channel and CH11 and CH12 are spare channels.
The transmitter function settings are shown below. A
total of 9 channels are used with three axes gyro control.

• The sensor may become damaged during strong impacts.

−
Green

6. Gyro sensitivity zeroThis is a three axes
connection example. The
rudder uses a GYA440 andthe receiver is an R6303SB.

• Determine the operating time of the receiver, gyro, and servo battery in the adjustPHQWVWDJHDQGGHFLGHWKHQXPEHURIÀLJKWVZLWKDPDUJLQWRVSDUH

• GYA441 initialization and neutral position reading. The GYA441 is initialized when
the power is turned on. In the AVCS mode, the neutral position is also read at thesame time. If initialization ends normally, the operator is informed by two repetitive
movements of the servo to the left and right (a little).

CH9
CH5

S.BUS 3-axes Connection Example

Always check the direction of operation of the gyro.

Display

2nd elevator
Gyro sensitivity (Elevator)

Failure to follow these safety precautions may result in severe injury
to yourself and others.
Check that there is sufficient transmitter battery capacity for
ﬂight.

Do not operate the airplane and transmitter sticks for about 3-5
seconds after turning on the GYA441 (When shared with the receiver).

CH2
CH6

Gyro sensitivity (Aileron)

GYA441• Analog servos may break down if "digital servo" mode is selected.

Monitor LED display

4. Turn※Only S.BUS is compatible with 1 servo.

WARNING

Name and Function of Each Part

3. End of initialization

Sensor tape

CH1

Elevator
2nd aileron

S.BUS Receiver

Magic strap (for clamping the wiring)● Easy setup%DVLFVHWWLQJVOHW\RXEHÀLJKWUHDG\LQDQLQVWDQWColor

AileronGyro gain CH(Receiver)←It does not connect→Port2(GYA441)
Remote gain is invalid. Trimmer(GYA441) becomes GAIN.

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Extension cord: (Black)Operation status

Gyro gain CH(Receiver)←connect→Port2(GYA441)
Remote gain eﬀective. Trimmer(GYA441) becomes LIMIT.

Set Contents● Remote gain function
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VZLWFKLQJ$OVRWKHJDLQFDQEHDGMXVWHGE\WKHWULPPHURQWKH*<$● Trimmer(LIMIT/GAIN)(Digital/Analog
servo function)

At S.BUS/S.BUS2 operation, the channels are fixed as shown in thetable below. Match the transmitter channels to these.
Function
Aileron mode
Elevator mode

Mini screwdriver● Compatible with aileron or elevator control
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switchAileron (Elevator) servo

Aileron(Elevator)
servo

Accessory connector (Red)• Gyro sensor: MEMS vibrating structure gyro
• Operating voltage: DC4.0V to 8.4V
• Current drain: 30mA (excluding a servo)• Operating temperature range: -10ºC to +45ºC• Dimensions: 20.5 x 20.5 x 11.0mm (except protrusion)• Weight: 3.7g
• Functions: (1) Gyro sensitivity trimmer, (2) Monitor LED, (3) Two servos
compatibility, (4) S. BUS/S.BUS2 compatibility, (5) Digital / analog servo
function● Dedicated airplane setting
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selector switch

GYA441

GYA441Gyro sensitivity CH

90°
Flat surface of the fuselage to which
double-sided tape easily sticks(double-sided tape does not stick to balsa)

LIMIT
GAIN

For RC models

INSTRUCTION MANUALGYA441 Ratings:(Integrated sensor type rate gyro)

S.BUS/S.BUS2 port

Rudder control(GYA440)

ServoLink the servo in accordance with the kit instruction manual.
Adjust the linkage rod so that the trim amount is as small as possible.

<2nd servo operating direction>
During aileron mode operation
the 2nd aileron servo
moves in thesame direction as theaileron servo. In the elevatormode, the 2nd elevator servo
moves in the opposite direction of the elevator servo.
Mount the servos as left andright objective linkage.

This places the gyro into the ready state. During initialization secure
the fuselage so that it will not move and fix the transmitter stickat the neutral position. Initialization takes about 3-5 seconds after
the receiver operates. After initialization the LED lights green. If theneutral position has changed, the LED will light orange. In this case,restart the gyro. Move the stick and check that the servo operates.

4

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.

＜Limit trimmer Adjustments＞

D/R (UP side)

DigitalDigital/Analog servo selection

LIMIT
GAIN

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 fromthe middle point.
Analog servo → A trimmer is adjusted by the Left rotation fromthe 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, respectively. The check of operational mode is discriminable in thedisplay color of LED. The stability of digital-servo mode of a ﬂight
increases in order to perform a high-speed control action.
Selection of digital/analog servo
is chosen towards a trimmer turning.

100%
Limit positionof digital servo

Digital-servo mode:
LED Orange
LIMIT
GAIN

Analog-servo mode:
LED Green[Limit position]
130%

70%
Limit positionof analog servo
100%

LIMIT
GAIN

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 analog servo mode. If it sets to digital-servo mode and it is operated, there is a danger that a servo will be destroyed.

（Aileron）

AnalogAileron stick right/left to full

Limit trimmer
Adjustments
It adjusts to the
maximum operation of
linkage.

● Trimmer operation*Make trimmer adjustments gently by using theincluded mini screwdriver.

Adjust the gyro sensitivity at the transmitter.
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1
2

Use the aileron/elevator selector switch to select aileron orelevator. (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 thetransmitter instruction manual. 50% of normal sensitivity will be -70%
at the rate of the sensitivity CH so that a next graph may be seen andunderstood.
Gyro sensitivity zero --- LED OFF
AVCS side --- LED red
NORMAL side --- LED green

3Turn on the receiver power. When the gyro starts the LED ﬂashes
green and initialization begins. When initialization ends theservo performs reciprocating operation to the left and right (a little).

AVCS 50%0%First,we recommend to
start with NORMAL30%.

AVCS 100%

0%

LIMIT
GAIN

NORMAL 50% NORMAL 100%

LIMIT
GAIN

NORMAL 30%

Gyro Sensitivity and AVCS Switching
When the remote gain function is used normally and AVCS
mode switching is performed in accordance with the directionof operation of the transmitterʼ 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 adjusting the end point rate. If the transmitter has a gyro sensitivity
setting mixing function, the sensitivity setting is performed directly.
When the remote gain function is not used, the clockwise direction 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 becomeszero. When the trimmer is turned fully to the left or right, thesensitivity becomes 100%.
The sensitivity setting criteria by end point is shown in theﬁgure below. The sensitivity becomes zero between end point-40% to +40% and becomes 100% at end point 100%.

＜ GAIN CH ＞100%

5

In the case of aileron control, switch the gyro direction switch andadjust 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 andadjust 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.

Gain

AVCS side（LED : RED）

AVCS

50%

GAIN 0％-100% -70% -40%
0%+40% +70% +100%
End point rate
50%

NORMAL side（LED : GREEN）
100%

Tilt the airplane to the left on
the ground and check that theailerons operate to the right. (Inthe case of aileron control)3UHÁLJKW$GMXVWPHQWV
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Tilt the airplane to theleft on the ground andcheck that the ailerons
operate to the right.
(In the case of aileroncontrol)>:KHQUHPRWHJDLQIXQFWLRQLVRII@
Adjust the gyro sensitivity with the GYA441 trimmer.
Do not use the AVCS mode.
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* In this case, 2 gain setup with a transmitter and 4 limit adjustment
of diﬀering in a procedure are lost. And as shown in a ﬁgure, gain isadjusted of the trimmer of GYA441.

NORMAL
When AVCS is used werecommend that thesensitivity CH be set tothe 3-position.

Refer to the transmitter instruction manual and set the end
point. When AVCS is used, setting the 3-positions switch to thesensitivity CH (there are types which cannot be set by transmitter) and setting it as shown above is recommended. In the caseof a 2-positions switch, inhibiting the gyro at 0% sensitivity suchas NORMAL mode and sensitivity 0% and AVCS mode and 0%
sensitivity is safe.
Tr i m m e r m o v e m e n t w h e n t h e AVCS 50% AVCS 100%
remote gain function is not used
(when S.BUS is not used and port
2 is not connected) . Please do not 0%
LIMIT
GAIN
use AVCS, when you do not use remote gain. Because, neutral memory cannot be performed. And taking NORMAL 50% NORMAL 100%oﬀ and landing being dangerous.

Servo Operation on the GroundIf the stick is moved when the airplane is on the ground, the servo 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.

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Adjust the transmitter and gyro while repeatedly taking oﬀ andlanding and with the aircraft on the ground.

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because it is dangerous.

1

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 threetimes 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.

2

Adjust the gyro sensitivity so that hunting (deflection of theaircraft 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 bedamaged. Hunting tends to stop when the airspeed is lowered.

AVCS / NORMAL Modes
The gyro has two operation modes: NORMAL mode and AVCS
mode. In the AVCS mode, angle control is performed at the sametime 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 maintained. 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 special attention to the elevator axis. To be safe, switching to the
NORMAL mode when taking oﬀ and landing is recommended.
When GYA441 used at the ailerons of a shoulder wing aircraft

AVCS

NORMAL

Left rudder applied

Left rudder applied

Aileron direction is forcefully
maintained level.

※⁦‒⁛⁥‒⁙⁡⁡⁖‒⁘⁡⁤‒⁕⁓⁤⁤⁫⁛⁠⁙‒⁡⁧⁦‒⁓‒⁝⁠⁛⁘⁗‒⁗⁖⁙⁗†

Aircraft gradually tilts to the left.

When tilted by left aileron

When tilted by left aileronFlies tilted to the left as long as
right aileron is not applied.

The airplane itself is stable and tries
to return to level ﬂight.

※⁦‒⁛⁥‒⁙⁡⁡⁖‒⁘⁡⁤‒⁕⁓⁤⁤⁫⁛⁠⁙‒⁡⁧⁦‒⁓‒⁔⁗⁙⁛⁠⁠⁗⁤⁥‒⁓⁠⁖‒⁦⁓⁝⁛⁠⁙‒⁡⁘⁘‒⁓⁠⁖‒⁞⁓⁠⁖⁛⁠⁙†

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 neutral position.
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2016, 1 (1)