Futaba GYA441 User Manual

Aileron (Elevator) servo

1M23N30802

Rate Gyro for Airplanes
Aileron or Elevator use

I

NSTRUCTION MANUAL

I

For RC models

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 prior
permission.

• 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.

NSTRUCTION MANUAL

Features of GYA441

● Dedicated airplane setting

Stabilizes ight, even with hard-to-control scale models.

● Compatible with aileron or elevator control

The GYA441 can be used even with airplanes with one servo each at the left

and right wings.(S.BUS only)

● Remote gain function

The remote gain function allows the sensitivity of the gyro to be adjusted from the
transmitter and the mode switching function allows AVCS/NORMAL gyro mode
switching. Also the gain can be adjusted by the trimmer on the GYA441.

● Integrated type, compact size and light weight

High-density mounting technology makes the GYA441 compact (20.5 x 20.5 x

11 mm) and lightweight (3.7 g).

● Easy setup

Basic settings let you be ight-ready in an instant.

● Supporting the S.BUS/S.BUS2 connection

Only one wire connection to the receiver can operate the GYA441.

Name and Function of Each Part

Aileron/Elevator

●

selector switch

Gyro direction

●

switch

Trimmer

●

(LIMIT/GAIN)
(Digital/Analog
servo function)

Operation status Color Display Remarks

1. No servo pulse /
sensor error

2. Start of initialization

3. End of initialization

4. Turn

5. Neutral deviation

6. Gyro sensitivity zero

7. Switch switching

8. Low battery

Port 3 (Aileron/Elevator servo output)

●

●

Monitor LED display

Red 4 flash

Green Fast blink

Red/Green/

Orange

Red/Green Fast blink

Orange Slow blink

－

Green One blink

Red One flash

Port 2 (2nd aileron or 2nd
elevator/Gyro sensitivity input)

Port 1 (S.BUS input/

●

Aileron and elevator
input)

LED

●

Servo

Steady

light

OFF

Mode

Normal Orange Green

When power drops to 3.8V

Digital Analog

AVCS Red Red

Right (Green)

Left (Red)

When stick operated

Each switching

or less

Thank you for purchasing the GYA441 airplane gyro. Compact and
lightweight, the GYA441 is designed to control the ailerons (roll axis) or
elevators (pitch axis). Features include simple set-up and S.BUS/S.BUS2
connectivity.

GYA441 Ratings:

(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) Two servos
compatibility, (4) S. BUS/S.BUS2 compatibility, (5) Digital / analog servo
function

Set Contents

The following items are supplied with the GYA441:

Mini screwdriver

GYA441

Extension cord: (Black)

Sensor tape

Magic strap (for clamping the wiring)

WARNING

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.

• Determine the operating time of the receiver, gyro, and servo battery in the adjust-

ment stage and decide the number of ights with a margin to spare.

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

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

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

• 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 the
same time. If initialization ends normally, the operator is informed by two repetitive
movements of the servo to the left and right (a little).

Always check the direction of operation of the gyro.

• Attempting to y with the operating direction reversed is extremely dangerous. Al­ways check your gyro's direction to ensure safe ights.

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

• The sensor may become damaged during strong impacts.

Do not use trims or mixing in AVCS mode.

• In the AVCS mode all corrections are made by the gyro. Therefore, if trimming and
mixing, are turned on, operation will be the same as deviating from the neutral po­sition.

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.

Do not place gyro near heating equipment (engine, motor, ESC,
battery, servo, etc.).

• Always allow the gyro to adjust to the surrounding environmental temperature be­fore ight. A large temperature change during use will cause drift and other opera­tional issues.

Extension cord: (Red)

Connection

Extension cord: (Black)

Aileron/Elevator CH

Receiver

Gyro sensitivity CH

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

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

To port 1

To port 2

Accessory connector (Red)

To port 3

GYA441

※Only S.BUS is compatible with 1 servo.

Extension cord: (Black)

S.BUS Receiver

S.BUS/S.BUS2 port

Aileron(Elevator)

servo

S.BUS Connection

To port 3

To port 2

To port 1

GYA441

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

Function Aileron mode Elevator mode

Aileron CH1

Elevator CH2

2nd aileron CH6

2nd elevator CH9

Gyro sensitivity (Aileron) CH5

Gyro sensitivity (Elevator) CH7

When there is 1
servo, port 2 is not
connected.

2nd servo

S.BUS 3-axes Connection Example

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

This is a three axes
connection example. The
rudder uses a GYA440 and
the receiver is an R6303SB.

S.BUS Receiver

S.BUS/S.BUS2 port

GYA441

GYA441

GYA440(Sold separately)

Aileron servo

Elevator servo

Rudder servo

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.

Function

Aileron CH1

Elevator CH2

Rudder CH4

2nd aileron CH6

2nd elevator CH9

Gyro sensitivity

(aileron)

Gyro sensitivity

(elevator)

Gyro sensitivity

(rudder)

GYA441

(aileron)

CH5

GYA441

(elevator)

CH7

GYA440
(rudder)

CH8

Mounting to the Chassis

The gyro is very sensitive to vibration. Securely mount it with the included double-sided sponge tape at a position where vibration is
minimal 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 the
wiring and bundle the wiring with the included magic strap so that it will not interfere with the rod.

Sensor tape

Degrease and stick

Gyro

Controlled axis (roll axis)

90°

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

＜ GYA441 aileron mounting ＞
The turning direction which xes the gyro can be any

direction up to 360° relative to the roll axis.

LIMIT

GAIN

Aileron control

Elevator control

Rudder control
(GYA440)

Servo

0%

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

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

.

A gain trimmer's work

＜

AVCS 50%

0%

AVCS 100%

LIMIT
GAIN

＞

First,we recommend to

start with NORMAL30%.

LIMIT
GAIN

Flight Adjustment

Adjust the transmitter and gyro while repeatedly taking o󱐯 and
landing and with the aircraft on the ground.

Transmitter adjustments must not be made while ying

because it is dangerous.

<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 direc­tion of the elevator servo.
Mount the servos as left and
right objective linkage.

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, re­spectively. The check of operational mode is discriminable in the
display color of LED. The stability of digital-servo mode of a ight
increases in order to perform a high-speed control action.

Selection of digital/analog servo
is chosen towards a trimmer turning.

Digital-servo mode:
LED Orange

LIMIT
GAIN

Analog-servo mode:
LED Green

When a remote gain function is o󱐯, 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 op­erated, there is a danger that a servo will be destroyed.

[Limit position]

Limit position
of digital servo

70%

Limit position
of analog servo

100%

100%

130%

LIMIT
GAIN

130%

Preight Adjustments

Setup before a ight [ Remote gain use ]

Adjust the gyro sensitivity at the transmitter.

At S.BUS connection or when gyro port 2 and the gyro sensitivity CH

of the receiver are connected

Use the aileron/elevator selector switch to select aileron or

1

elevator. (Aileron: AIL Elevator: ELE)　　　　

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

2

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 ashes

3

green and initialization begins. When initialization ends the
servo performs reciprocating operation to the left and right (a little).

Gyro sensitivity zero --- LED OFF

AVCS side --- LED red

NORMAL side --- LED green

Move the stick to the maximum left and right and adjust the gyro

4

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)

Aileron stick right
/left to full

● Trimmer operation

*Make trimmer adjust­ments gently by using the
included mini screwdriver.

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

5

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, ight
will become impossible so make the settings positively.

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)

Digital

Analog

Analog

LIMIT
GAIN

Limit trimmer
Adjustments

（

）

Aileron

It adjusts to the
maximum operation of
linkage.

[ When remote gain function is off ]

Adjust the gyro sensitivity with the GYA441 trimmer.

Do not use the AVCS mode.

All remote gains are effective at S.BUS connection. When port 2 is not
connected when S.BUS is not used remote gain is inhibited. In this case,
the limit trimmer is automatically changed to gyro sensitivity setting
trimmer.

(Limit position is xed at operating angle left and right 55. A servo is
xed to analog mode.)

In this case,

*

of di󱐯ering in a procedure are lost. And as shown in a gure, gain is
adjusted of the trimmer of GYA441.

gain setup with a transmitter and

2

limit adjustment

4

NORMAL 100%NORMAL 50%

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 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 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 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
gure below. The sensitivity becomes zero between end point

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

GAIN CH

＜

NORMAL side（LED : GREEN）

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 transmit­ter) 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
o󱐯 and landing being dangerous.

＞

100%

Gain

-70%-100%

-40%

AVCS side（LED : RED）

50%

0%

+40%

End point rate

50%

100%

+70% +100%

AVCS 50%

0%

AVCS

GAIN 0％

NORMAL

When AVCS is used we
recommend that the
sensitivity CH be set to
the 3-position.

AVCS 100%

LIMIT
GAIN

NORMAL 100%NORMAL 50%

Servo Operation on the Ground

If 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.

1080 Yabutsuka, Chosei-mura, Chosei-gun, Chiba-ken, 299-4395, Japan

Phone: [phone], Facsimile: [phone]

©FUTABA CORPORATION 2016, 1 (1)

FUTABA CORPORATION

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

1

or in the
between 0% sensitivity (or
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 ight.

Adjust the gyro sensitivity so that hunting (deflection of the

2

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.

NORMAL

mode. After trimming, switch the gain switch

NORMAL

mode) and the AVCS mode three

AVCS / NORMAL Modes

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 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 o󱐯 and landing is recommended.

When GYA441 used at the ailerons of a shoulder wing aircraft

AVCS

Left rudder applied

Aileron direction is forcefully
maintained level.

It is good for carrying

out a knife edge.

When tilted by left aileron

Flies tilted to the left as long as
right aileron is not applied.

NORMAL

Left rudder applied

Aircraft gradually tilts to the left.

When tilted by left aileron

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

It is good for carrying

out a beginners and

taking off and landing.