1M23N30702

Connection

Rate Gyro for Airplanes
Elevator or Rudder use

S.BUS Connection
To port 3

Extension cord: (Black)

Extension cord: (Black)

To port 3
To port 1

Elevator /Rudder CH

To port 1

To port 2

S.BUS Receiver

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For RC models

INSTRUCTION MANUAL

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 GYA440(Integrated sensor type rate gyro)• 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) CH change
elevator or rudder, (4) S.BUS/S.BUS2 compatibility, (5) Digital/Analog
servo function● Integrated type, compact size and light weight+LJKGHQVLW\PRXQWLQJWHFKQRORJ\PDNHVWKH*<$FRPSDFW 
[[PP DQGOLJKWZHLJKW J ● Supporting the S.BUS/S.BUS2 connection
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Name and Function of Each Part● Elevator/Rudder ● Port 3 (Elevator/Rudder servo output)
selector switch● Port 2 (Gyro sensitivity input)● Port 1 (S.BUS input/
Elevator/Rudder servo
input)

Color

CH2

RudderCH4

Gyro sensitivity (Elevator)

CH7

Gyro sensitivity (Rudder)

CH8This is a three axes
connection example. The
aileron uses a GYA441 andthe receiver is an R6303SB.

GYA441 (Sold separately)

Aileron servo

S.BUS connectivity minimizes wiring. The GYA440
and GYA441 can be connected by one 3-way hub. The
aileron, elevator, and rudder servos are output fromthe gyro. Standards 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, andCH12. CH3 is the throttle channel and CH11/CH12 arespare channels.
The transmitter function settings are shown below. A
total of 9 channels are used with 3-axes gyro control.

S.BUS Receiver

Function

GYA441(Aileron)

Aileron

CH1

GYA441(Elevator)

ElevatorS.BUS/S.BUS2 port

2nd aileron

Elevator servo

CH2
CH4
CH6

2nd elevator

WARNING
Failure to follow these safety precautions may result in severe injury
to yourself and others.

GYA440

Check that there is sufﬁcient transmitter battery capacity for ﬂight.
• 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GYA440(Rudder)Rudder

GYA441 (Sold separately)

Rudder servo

Gyro sensitivity(aileron)
Gyro sensitivity(elevator)
Gyro sensitivity(rudder)

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

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3 ﬂashGreen

Fast blink

3. End of initialization

Red/
Green/
Orange8. Low Battery

ChannelElevatorS.BUS 3-axes Connection Example

Extension cord: (Red)

Do not operate the airplane and transmitter sticks for about 3-5
seconds after turning on the GYA440 (When shared with the receiver).

Function

Always check the direction of operation of the gyro.

2. Start of initialization

7. Switch switching

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movements of the servo to the left and right (a little).

● LED

1. No servo pulse /
sensor error

6. Gyro sensitivity zero

Extension cord: (Black)

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Monitor LED display

5. Neutral deviation

GYA440At S.BUS/S.BUS2 operation, the channels are fixed as shown in thetable below. Match the transmitter channels to these.

Gyro gain CH(Receiver)←It does not connect→Port2(GYA440)
Remote gain is invalid. Trimmer(GYA440) becomes GAIN.

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

4. Turn

Gyro gain CH(Receiver)←connect→Port2(GYA440)
Remote gain eﬀective. Trimmer(GYA440) becomes LIMIT.

Elevator(Rudder)servo

Set Contents

Mini screwdriver● Remote gain function
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Operation status

Elevator (Rudder) servo

Accessory connector (Red)GYA440 Ratings:● Compatible with elevator or rudder control
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● Trimmer (Limit/
GAIN)(Digital/ Analog servo
function)

GYA440GYA440Gyro sensitivity CH

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6WDELOL]HVÀLJKWHYHQZLWKKDUGWRFRQWUROVFDOHPRGHOV● Gyro direction
switchS.BUS/S.BUS2 port

Steady
light

Red/
Green
Orange−Green

Slow blinkOFF
One blinkRed

One ﬂash

Fast blink

Remarks

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

＜ Elevator mounting ＞
Gyro• The sensor may become damaged during strong impacts.
Mode

Servo

AVCS

Controlled axis (pitch axis)

Do not use trims or mixing in AVCS mode.
DigitalAnalogRed

Normal Orange

Red
Green

Right (Green)
Left (Red)When stick operated
Each switching
When power drops to 3.8V
or less• In the AVCS mode all corrections are made by the gyro. Therefore, if trimming and
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Do not use the GYA440 for applications other than RC airplanes.

＜ Rudder mounting ＞

Aileron control(GYA441)90°
Flat surface of the fuselage to which
sensor tape easily sticks(Sensor tape does not stick to balsa)

Elevator control•This gyro is designed for RC airplanes only. Do not use it for other applications.

Do not place gyro near heating equipment (engine, motor, ESC,
battery, servo, etc.).
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＜ GYA440 elevator mounting ＞
The turning direction which ﬁxes the
gyro can be any direction up to 360°
relative to the pitch axis.

Rudder control

Servo＜Limit trimmer Adjustments＞

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

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

（Elevator）

AnalogLimit trimmer
Adjustments

Elevator stick up/down to full

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

It adjusts to the
maximum operation of
linkage.

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%.

5

In the case of rudder control, move the gyro direction switch andadjust 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.

＜ GAIN CH ＞
100%

Gain

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Tilt the airplane to theup on the ground andcheck that the elevator
operate to the down.
(In the case of elevator
control)

AVCS-100% -70% -40%
0%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)
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 thereceiver 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.

NORMAL side（LED : GREEN）
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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, 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 GYA440.

＜ A gain trimmer's work ＞
AVCS 50%

AVCS 100%

LIMIT
GAIN

NORMAL 50% NORMAL 100%GAIN 0％First, we recommend to
start with NORMAL 30%.

0%NORMAL 30%

LIMIT
GAIN

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.

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.
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.

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.

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.

Tilt the airplane to the left on
the ground and check that therudder operate to the right. (Inthe case of rudder control)

0%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.

+40% +70% +100%
50%

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 thetransmitter 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.
Gyro sensitivity zero --- LED OFF
AVCS side --- LED red
NORMAL side --- LED green

AVCS side（LED : RED）
50%

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4When the remote gain function is used normally and AVCS
mode switching is performed in accordance with the direction ofoperation of the transmitter's remote gain channel. At the + rateside, 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.

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.

12

Gyro Sensitivity and AVCS Switching

When GYA440 used at the rudder of airplane
In AVCS operation
Mode

In NORMAL operation
Mode

AVCS is working
properly duringa cross wind.

NORMAL in a crosswind.
The tail will drift.

Cross
wind

Cross
wind

If no left rudder input
is given, the machine
will drift to the right.

A head turns to a
direction of movement
automatically.

If it starts rightward

If it starts rightward

Trimmer movement when the
AVCS 50% AVCS 100%
remote gain function is not used
(when S.BUS is not used and port
2 is not connected) . Please do0%
LIMIT
not use AVCS, when you do not
GAIN
use remote gain. Because, neutral
memory cannot be performed.
NORMAL 50% NORMAL 100%
And taking off and landing being
dangerous.

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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

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2016, 1 (1)