Futaba GY520 Gyro Manual

Futaba GY520 is a compact and lightweight heading hold rate gyro designed for model helicopters. Its advanced high-speed control algorithm ensures precise tail control, making it ideal for a wide range of helicopters, from electric to 90-size models. With selectable F3C and 3D modes, adjustable gyro sensitivity, and compatibility with both digital and analog servos, the GY520 offers versatility and customization to suit different flying styles and preferences.

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NSTRUCTION

ANUAL

YAW-AXIS STABILIZER FOR MODEL HELICOPTER

(RATE GYRO)

1M23N21902

Thank you for purchasing a GY520 AVCS gyro.

Before using your new gyro, please read this instruction manual thoroughly and use the gyro properly and safely. After reading this manual, store it in a safe place.

FOREWORD

The GY520 is a small heading hold AVCS rate gyro for model helicopters. Advanced tail control from electric helicopters to 90 size helicopters is realized by adoption of an advanced high speed control algorithm.

*AVCS: Active Angular Velocity Control System

[GY520 Features]

• Small size and light weight (20.8x20.8x11.0mm, 8g)

• High speed control (280Hz/560Hz variable)

• F3C mode and 3D mode selectable

• Compatible with both digital (1520 ȝ

S/760 ȝ

S) and analog servos

• Simple setting by button and LED combination

• Parameters can be set through a PC by using the optional USB adapter (CIU-2) and dedicated software (Expansion function)

[Recommended servos]

Helicopter servos;

• 1520 ȝ

S neutral type

S9254, BLS254, S9257 (for small EP helicopters)

• 760 ȝ

S neutral type

S9256, BLS251 ｎ CAUTION ｊ Always set the mode matched to the type of servo to be connected to the GY520. (Servo selection function p.24)

• The GY520 is compatible with digital (1520μS and 760μS) servos.

However, the mode matched to the type of servo must be selected. If the GY520 is operated in the wrong mode it may malfunction or the servo may be damaged.

ABLE OF

ONTENTS

FOR SAFETY

• Meaning of Special Markings ------------------------------- 4

• Mounting/Operating Precautions --------------------------- 4

• Fuselage Maintenance Precautions ------------------------- 7

BEFORE USE

• Set Contents --------------------------------------------------- 8

• Name and Function of Each Part ------------------------- 10

• GY520 Operation ------------------------------------------- 12

INSTALLATION AND ADJUSTMENT

• Installing to Fuselage --------------------------------------- 15

• Initialization ------------------------------------------------- 18

• Linkage Adjustments --------------------------------------- 19

• Flight Adjustments ------------------------------------------ 21

DESCRIPTION OF FUNCTIONS

• GY520 Operating Parameters Setting -------------------- 23

• Gyro Sensitivity Setting ------------------------------------ 28

REFERENCE

• Speci

¿ cations ------------------------------------------------ 37

• Repair Service (in U.S.A.) --------------------------------- 39

Warning: This product contains a chemical known to cause cancer and birth defects or other reproductive harm.

• 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.

• This manual has been carefully written. Please write to Futaba if you feel that any corrections or clariﬁcations should be made.

AFETY

OR

AFETY

To ensure safe use, observe the following precautions.

Meaning of Special Markings

Pay special attention to the safety at the parts of this manual that are indicated by the following marks. ｎｎ WARNING ｎ

Mark

DANGER

CAUTION

Meaning

Procedures which may lead to a dangerous condition and cause death or serious injury to the user if not carried out properly.

Procedures which may lead to a dangerous condition or cause death or serious injury to the user if not carried out properly, or procedures where the probability of superficial injury or physical damage is high.

Procedures where the possibility of serious injury to the user is small, but there is a danger of injury, or physical damage, if not carried out properly.

Symbol: ｌ ; Prohibited, ｊ ; Mandatory

Mounting/Operating Precautions

ｎ WARNING ｊ Insert the connectors fully and ﬁrmly.

• If a connector works loose due to vibration during ﬂight, control may be lost and result in a dangerous situation. ｊ Always use the GY520 with a FASST-2.4GHz system or PCM system.

F OR S AFETY

• Using the GY520 with an FM system, when noise enters, the wrong neutral position may be memorized.

ｊ When mounting the GY520, provide a little surplus so that the sensor connection cables are not too taut.

• If the GY520 cables are too taut, the gyro will not display its full performance. If the sensor peels, control will be lost and result in a dangerous situation.

ｊ Always check the direction of operation of the servos.

• If you attempt to ﬂy the model when a servo operates in the wrong direction, the fuselage will spin in a ﬁxed direction and enter an extremely dangerous state.

ｎ CAUTION ｊ Always set the mode matched to the type of servo to be connected to the GY520. (Servo selection function p.24)

• The GY520 is compatible with digital (1520μS and 760μS) servos. However, the mode matched to the type of servo must be selected. If the GY520 is operated in the wrong mode it may malfunction or the servo may be damaged.

ｊ Always use the accessory sensor tape to install the

GY520 to the fuselage.

• This is necessary to securely fasten the sensor to the fuselage so that operation of the gyro does not transmit unwanted fuselage vibrations directly to the sensor.

ｊ Mount the GY520 so that metals or other conductive objects do not touch these cases.

• The GY520 uses a conductive resin case to reduce electromagnetic interference. Because the surface of the case is conductive, metal objects may cause a short circuit.

AFETY

Precautions When Turning on the Power Switch ｌ Do not move the helicopter until the ﬂashing of the monitor LED goes out (in about 5 seconds). Also, do not move the transmitter rudder stick from the neutral position during this period.

ｊ When the rudder neutral position was changed by the linkage, the rudder neutral position in the AVCS mode must always be re-read before use.

• Re-reading method:

Turn on the transmitter in the AVCS mode, then turn on the gyro. Or quickly switch (interval of within 1 second) the remote gain channel switch between the AVCS mode and Normal mode at least three times and switch the AVCS side with the transmitter in the ON state. This memorizes the new rudder position inside the GY520.

ｊ Avoid sudden temperature changes.

• Sudden temperature changes will cause the neutral position to change. For example, in the winter, do not ﬂy immediately after removing the model from inside a heated car and in the summer, do not ﬂy immediately after removing the model from inside an air conditioned car. Allow the model to stand for about 10 minutes and turn on the power after the temperature inside the gyro has stabilized. Also, if the gyro is exposed to direct sunlight or is mounted near the engine, the temperature may change suddenly. Take suitable measures so that the gyro is not exposed to direct sunlight, etc.

ｊ Check the remaining receiver/gyro/servo nicd battery operating time during the adjustment stage and decide how many ﬂights are remaining.

ｌ Never use the transmitter rudder trim in the AVCS mode.

• When the rudder is trimmed during ﬂight, the neutral position will change.

F OR S AFETY ｊ When using the GY520 in the AVCS mode, set revolution mixing to OFF.

ｌ Do not strike the gyro body against a hard object or drop the gyro onto a concrete or other hard ﬂoor surface.

• The gyro sensor is vulnerable to shock and may be damaged by strong shock.

Fuselage Maintenance Precautions

ｎ CAUTION ｊ Use a tale rotor drive tube or other part with a high torsion performance for the tail drive.

Take the strength of the tail into account during inspection and adjustment.

• The amount of improvement of gyro performance has a considerable effect on the fuselage vibration level or the size, type, linkage method, looseness, etc. of the tail rotor.

Since a higher gain than usual can be used then the tail rotor is more effective, the load on the tail is also greater.

ｊ Always perform proper maintenance for ultimate performance.

• The rigidity of the fuselage tail has a large effect on gyro performance. ｊ Make the fuselage vibration as small as possible.

• Fuselage vibration has an adverse affect on gyro operation.

EFORE

EFORE

SE

Set Contents

After unpacking the GY520 set, first check if the following parts are provided:

GY520 Sensor tape

(2mm and 3mm thick)

Mini screwdriver

Damping plate

Connection cord(Black/Red)

B EFORE U SE

Servo (x1):

(Only a set w/servo)

S9254 or BLS254

S9257

*Servo horn etc. are supplied at a set w/servo.

EFORE

Name and Function of Each Part

Monitor LED

• I n d i c a t e s t h e operating state and setting state.

(Blue, red, violet/ steady light, blinking)

Button switch

• Used to set the GY520 operating parameters.

• W h e n o p e ra t i n g t h e button, always use the accessor y miniature screwdriver and do not use excessive force.

(Output connector)

Rudder servo connection

(Connector box)

(Left)

Gyro sensitivity input

(Right)

Rudder input

(Receiver connector)

• Use the accessory connection cord to connect the receiver to the connector box.

B EFORE U SE

Monitor LED display

The monitor LED displays the gyro's operating state.

Operation

Starting

State

No servo pulse/sensor error

Warm-up

LED display

Red Slow blink

Blue Slow blink

Sensor initialization

Blue Fast blink

Normal mode (gyro static)

AVCS mode (gyro static)

Blue

Red

Operating

At the neutral offset in the

AVCS mode (gyro static)

Violet Slow blink

Gyro rotating clockwise

(depending on the installing direction)

Blue Fast blink

Gyro rotating counterclockwise (depending on the installing direction)

Red Fast blink

EFORE

GY520 Operation

The GY520 is used by switching between Normal mode operation and AVCS mode operation from the transmitter. (See p28 for a description of the operation mode and sensitivity setting method.)

The differences between the operation modes are shown in the table below.

Operation mode

Operation

Normal mode

AVCS mode

The GY520 operates with the angle correction function in the OFF state. When the helicopter is moving forward a weathervaning effect appears as a special feature.

An integration function is added and the angle correction function is turned on. As a special feature, the model stubbornly holds its position even in a side wind while moving forward and backward.

GY520 initialization

When the power is turned on, the interior of the GY520 is automatically initialized. When the rudder servo operates four times between right and left, the initialization is completed. When the power is turned on in the AVCS mode, the AVCS mode operation reference data (rudder neutral position) is updated. Therefore, always pay attention to the following when turning on the power.

ｎ CAUTION

(Caution at power ON) ｊ Do not move the helicopter and rudder stick for about 5 minutes after the gyro power (shard with the receiver) is turned on.

• When the power is turned on, the interior of the GY520 is automatically initialized. Do not move the helicopter and rudder stick until the LED of the GY520 lights red or blue.

B EFORE U SE

Operation in AVCS mode

If the rudder stick is operated or the helicopter is moved when the helicopter was stopped during operation in the AVCS mode, the servo will not return to the neutral position even if the rudder stick is returned to the neutral position, and when the rudder stick is moved, the rudder servo controls operation until the tail reaches the maximum point. This is caused by addition of an integration function as an AVCS mode operation and is not an abnormality. In actual

À ight, the gyro constantly monitors movement of the tail and controls the servo so that movement of the tail is stopped.

Rudder linkage neutral position;

When

À own in the AVCS mode, the GY520 automatically trims the rudder even if the rudder linkage change slightly and linkage changes are dif

¿ cult to judge. However, for the gyro to operate at peak performance, it is important that the servo horn be perpendicular to the linkage rod when the rudder servo linkage is in the neutral position.

For this reason, adjust the linkage by initially

À ying in the Normal mode and taking the rudder neutral position. Adjust the linkage without using transmitter rudder as much as possible and adjust the pitch angle of the tail rotor so that the rudder is in the neutral position when the servo horn is perpendicular to the linkage rod. This position is the rudder neutral reference position in the AVCS mode.

There are the following two methods of reading this neutral reference position to the gyro:

Method (1)

Method (2)

Methods of reading the AVCS neutral reference position

Operate the Normal/AVCS mode selector switch 3 times within 1 second and set it to the AVCS mode side. The position of the rudder stick at this time is memorized at the gyro.

Turn on the gyro power in the AVCS mode. The rudder stick position at this time is memorized at the gyro.

EFORE

AVCS mode servo neutral position check method;

If the rudder stick or the helicopter was moved in the AVCS mode, the servo will not return to its original neutral position. When the power is turned on, the servo will return to the neutral position. The servo neutral position can also be checked by the following method.

Neutral position

Move the rudder stick 3 times to its full stroke to the left and check method right at an internal of within 1 second and immediately return the rudder stick to the neutral position. The servo moves to the neutral position about 1 second later.

ｎ CAUTION ｌ Never use the transmitter rudder trim in the AVCS mode.

• When the rudder is trimmed during ﬂight, the neutral position will change.

ｊ When using the GY520 in the AVCS mode, set revolution mixing to OFF.

ｊ When the rudder neutral position was changed by the linkage, the rudder neutral position in the AVCS mode must always be re-read before use.

I NSTALLATION AND A DJUSTMENT

NSTALLATION AND

DJUSTMENT

Install and adjust the GY520 as described below.

Installing to Fuselage

Installing the gyro

GY520

Sensor tape (Use the accessory sensor tape.)

(Fuselage gyro bed)

[IMPORTANT] Install the sensor so that the bottom of the gyro is perpendicular to the main shaft axial direction.

Offset of this axis will also react in the roll and pitch directions.

[IMPORTANT] The gyro sensor is very sensitive to vibration. Adjust it so that helicopter vibrations are minimal. In addition, provide a margin when securing the cable coming from the gyro body.

[Gyro handling precautions]

* Always use the accessory sensor tape and install the gyro to the center

(vertical and horizontal equal) of the sensor tape. This tape is designed to effectively absorb the vibrations from the helicopter.

* Use a cleaner to wipe off oil from the bottom and fuselage mounting surfaces of the sensor.

* The sponge may tear near the corners of the sensor tape depending on the use. If the helicopter is flown in this state, vibrations may not be sufficiently absorbed and the sensor may fall off. Before flight, always check the sensor installation state. If the sponge is torn, replace it.

* When twitching of the tail caused by vibration of the fuselage cannot be suppressed, install the accessory damper plate by sandwiching it between pieces of sensor tape.

Sensor tape

(Use the accessory sensor tape.)

Damper plate

(Use the accessory damper plate.)

NSTALLATION AND

DJUSTMENT ｎ CAUTION ｌ Do not strike the gyro body against a hard object or drop the gyro onto a concrete or other hard ﬂoor surface.

• The gyro sensor is vulnerable to shock and may be damaged by strong shock.

Vibration

The gyro sensor used is called a vibration gyro. Its construction is such that a microscopic moving part on a silicon wafer is vibrated and the Coriolis force generated is sensed and the angular speed is detected. Therefore, it is intrinsically sensitive to extraneous vibration.

It is affected more by X, Y, and Z axes linear vibrations than yaw axis revolving vibration. If the applied vibration exceeds the sensor's allowable value, gyro operation will be affected and the tail will quiver or twitch.

The helicopter generates vibrations over a wide frequency range, from basic engine vibration (200Hz at 12,000) to several thousand kilohertz. Vibrations up to several hundred hertz are visible to the eye.

High frequency vibration may cause the gyro to operate erroneously even if visible vibration is not generated.

Always use the excellent vibration absorption sponge tape supplied to mount the GY520. Two kinds of sponges matched to the fuselage are provided. Use of the 2mm thick sponge is affective for electric helicopters, etc. and use of the 3mm thick sponge is affective when the fuselage vibration of gasoline engine helicopters, etc. is large.

Install using one piece of sponge tape at the center on the helicopter gyro mount.

Effective damping of vibrations is possible in this state, but if the tail quivers or twitches, the gyro may be affected by vibrations. Basically, countermeasures must be taken against the source of vibrations generated by the helicopter. The damping effect can also be increased by mounting the gyro by sandwiching the accessory damping plate between 2 pieces of sponge tape.

Two types of sponge tape are supplied; 2mm and 3mm thick. The

3mm sponge tape has a better shock absorption effect than the 2mm sponge tape. Select and use the tape matched to the fuselage.

I NSTALLATION AND A DJUSTMENT

Connection method

Connect the GY520, receiver, and servos as shown below.

• Connect the sensitivity setting channel output of the receiver to the sensitivity input of the connector box using the accessory connection code (red).

• Connect the rudder channel output of the receiver to the rudder input of the connector box using the accessory connection code (black).

(Red)

(Servo)

Servo output

( Connector box

)

Sensitivity input

(red)

(Black)

To receiver

• Accessory connection cord

Rudder input

(black) ｎ WARNING ｊ Insert the connectors fully and ﬁrmly.

• If a connector works loose due to vibration during ﬂight, control may be lost and result in a dangerous situation. ｎ CAUTION ｊ Always set the mode matched to the type of servo to be connected to the GY520. (Servo selection function p.24)

NSTALLATION AND

DJUSTMENT

Initialization

Before adjusting the linkage, make the settings and checks described in "GY520 Initialization", "Gyro Sensitivity Initialization", and "Transmitter Setting Check" below.

GY520 Initialization

Set the following GY520 operating parameters in advance. For a description of the setting method, see "GY520 Operating Parameters Setting" (p.23).

[F3C/3D mode setting]

• When delicate rudder operation is necessary, select the F3C mode and when you want to react to rudder stick operation more sensitively, select the 3D mode.

[Servo selection]

• Select the mode matched to the type of servo to be connected to the

GY520.

When using a BLS254/S9254/S9257/S9253, select the digital 1520μS mode, when using a BLS251/S9256/S9251, select the digital 760μS mode, and when using an analog servo, select the analog servo mode.

[Response setting]

• For a 3D aerobatic helicopter or a small helicopter, optimize control by selecting the high speed mode. For a large scale helicopter and tail heavy fuselage, optimize control by selecting the low speed mode. Select the optimum value during ﬂight.

Gyro Sensitivity Initialization (Tentative setting)

Set the gyro sensitivity at the transmitter. For a description of the setting method, see the "Gyro Sensitivity Setting" (p.28) item.

Tentatively set the sensitivity when hovering and in

À ight to the following values:

• Hovering: 70% (both AVC and NOR)

• Flight: 40% (both AVC and NOR)

I NSTALLATION AND A DJUSTMENT

Transmitter Settings Check

Check the transmitter settings in the AVCS mode. Check that the transmitter is not set so that the neutral position has shifted.

[Transmitter setting]

• Set all rudder mixings to INH.

• Set all hovering and ﬂight rudder trims to the same position.

• Set the rudder steering angle to 100% under all conditions.

• Also set the T14MHz, etc. condition delay function to INH.

The neutral offset in the AVCS mode can be checked at the

GY502 LED. When the LED is slowly blinking violet, neutral offset is present.

Linkage Adjustment

Adjust the linkage as described below.

* Perform initial linkage adjustment in the Normal mode. In this case, make adjustments mechanically. Make trim adjustments at the transmitter as small as possible.

Rudder Servo Linkage Check

• In the rudder neutral position, connect the linkage at the position at which the servo horn and the tail control rod are perpendicular.

Perpendicular

Tail control rod

• Set the servo horn length based on the helicopter manufacturer's instructions.

Move the rudder stick to the right and left and check the direction of operation of the tail rotor. If the tail rotor turns in the wrong direction, reverse the direction using the transmitter reverse function.

NSTALLATION AND

DJUSTMENT

Gyro operation direction check

If the rudder gyro moves to the right when the nose of the helicopter moves to the right, the gyro direction is correct.

• If the rudder servo moves in the opposite direction, switch the direction using GY520 reverse setting (p.24).

ｎ CAUTION ｊ Always check the gyro operation direction.

• If you try to ﬂy the helicopter while the gyro direction is incorrect, the helicopter will yaw in a ﬁxed direction and create a very dangerous situation.

Limit setting

Set the rudder servo operation limit angle at which the servo horn does not strike the linkage.

• For a description of the adjustment method, see "GY520 Limit Setting"

(p.25).

• When ﬂying, the servo horn does not move beyond this angle, thus protecting the linkage. However, if the setting is too low, the gyro characteristics will be affected.

• At limit setting, only the stick operates. The gyro does not operate.

I NSTALLATION AND A DJUSTMENT

Flight Adjustments

In the AVCS mode, turn on the transmitter power and then turn on the receiver power. This initializes the GY520 and simultaneously reads the AVCS mode reference data

(rudder neutral).

• Do not move the helicopter or rudder stick until the GY520 LED lights red (approximately 5 seconds).

Hover in the Normal mode and adjust the rudder neutral position.

• In the AVCS mode, the rudder neutral position is automatically set and linkage changes cannot be veriﬁed. First, perform rudder neutral position adjustment in the Normal mode.

• If the rudder servo neutral position has changed considerably, readjust the linkage.

After rudder neutral position adjustment in the Normal mode is complete, update and memorize the AVCS mode memory as described below. This memorized data becomes the neutral position reference in the AVCS mode.

If rudder trim was changed, don't forget to update the memory.

• In the AVCS mode, turn on the power or operate the AVCS mode switch 3 times within 1 second and set it to the AVCS mode. The rudder stick position at this time is memorized at the gyro.

Adjust the sensitivity to the position at which hunting does not occur during hovering and ﬂight.

• Since the GY520 has an extremely fast response, hunting almost never occurs. Adjust the sensitivity while observing the pirouette and stall turn stopping conditions, etc.

Adjust the hovering and ﬂight rudder effect using the transmitter's D/R or AFR function.

NSTALLATION AND

DJUSTMENT

• Do not perform adjustment using the END POINT (ATV) function. If the

END POINT (ATV) function is used, trimming may change.

This ends basic adjustments.

Pirouette speed

The pirouette speed of a helicopter is completely controlled in accordance with the amount of rubber control. For 100% rudder operation amount, the pirouette speed is set to approximately 450deg/sec

(at 100% gyro sensitivity) in the F3C mode and to 720deg/sec in the

3D mode. In addition, in the F3C mode, the setting is such that the pirouette speed increases as the gyro sensitivity decreases so that the hovering and

À ight pirouette speeds change automatically.

The dynamic range (controllable range) of the gyro sensor is adjusted to approximately 800deg/sec. Therefore, when the rudder operation amount exceeds this dynamic range, the helicopter enters the full pitch state and pirouettes at ultra high speed. Be especially careful in the 3D mode because the pirouette speed is set to a high speed and the helicopter will enter this state when the rudder operation amount exceeds 110%. The rudder operation amount can be set using the

AFR, DR, and END POINT (ATV) functions of the transmitter.

D ESCRIPTION OF F UNCTIONS

ESCRIPTION OF

UNCTIONS

GY520 Operating Parameters Setting

Set the GY520 operating parameters after switching from the Normal mode to the Setting mode. There are 6 setting items in all.

[Switching to the Setting mode]

• Press the GY520 button for about 3 seconds (until the violet LED lights momentarily). The GY520 is switched to the following Setting modes.

[Setting mode]

(Parameter)

1. Servo selection

(Setting)

Digital 1520μS servo*

Digital 760μS servo

Analog servo

(LED display)

Blue 1 blink

Red 1 blink

Violet 1 blink

2. Reverse setting

Normal*

Reverse

Blue 2 blinks

Red 2 blinks

3. Limit setting (Servo operation limit setting) Blue 3 blinks

F3C mode*

4. F3C/3D mode setting

3D mode

Blue 4 blinks

Red 4 blinks

5. Response setting

Reference*

Fast

Slow

Blue 5 blinks

Red 5 blinks

Violet 5 blinks

6. Data reset (Resets settings (1)-(5).) Blue 6 blinks

*: Initial setting

[Setting item switching]

• Press the button for about 2 seconds (until the violet

LED lights momentarily). The setting item is switched.

ESCRIPTION OF

UNCTIONS

1. Servo selection [LED 1 blink]

Selects the mode matched to the type of servo connected to the gyro. Use a Futaba gyro dedicated servo.

• Compatible with 3 types of servo.

• The gyro operates at top performance when used with a digital 760μS servo.

ｎ CAUTION ｊ Always set the mode matched to the type of servo connected to the gyro.

• If operated in the wrong mode, the gyro may malfunction or the servo may be damaged.

Setting

Digital 1520μS servo*

Digital 760μS servo

Analog servo

*: Initial setting

LED state

Blue 1 blink

Red 1 blink

Violet 1 blink

Servo type selection method

1. Press the button and set to the LED fast blinking state. (Fast blinking stops in about 1 second.)

2. When the button is momentarily pressed again in the LED fast blinking state, the setting is switched.

Compatible servos:

• Digital 1520μS servo: BLS254, S9254, S9257, S9253

• Digital 760μS servo: BLS251, S9256, S9251

• Analog servo: All analog servos

2. Reverse setting [LED 2 blinks]

Sets the gyro operation direction. Set the operation direction so that when the nose of the helicopter is moves to the right, left correction rudder is applied and when the nose of the helicopter is moves to the left, right correction rudder is applied.

D ESCRIPTION OF F UNCTIONS ｎ WARNING ｊ Always check the gyro operation direction.

• If you try to ﬂy the helicopter while the gyro direction is incorrect, the helicopter will yaw in a ﬁxed direction and create a very dangerous situation.

Setting

Normal*

Reverse

LED state Method of changing gyro operation direction

Blue 2 blinks

Red 2 blinks

1. Press the button and set to the LED fast blinking state. (Fast blinking stops in about 1 second.)

2. When the button is momentarily pressed again in the LED fast blinking state, the setting is switched.

*: Initial setting

3. Limit setting [LED 3 blinks]

Sets the rudder servo operation limit angle. Adjust the angle after mounting the servo to the fuselage.

Servo operation limit setting method

1.Blinking of the LED 3 times indicates that the gyro is in the limit setting mode. When the button switch is pressed once, the LED blinks rapidly and the gyro enters the single-side (PWM signal wide side) setting mode. The servo operates up to the memorized limit position.

2.When the rudder stick is moved to the left and right during this adjustment, the servo deﬂection angle is increased and decreased. When the button switch is momentarily pressed once when the rudder servo is in the position at which the rudder linkage does not strike a stopper or any part of the fuselage, that position is memorized. The LED momentarily lights violet. To complete setting, move the servo to the position to be memorized at the other (narrow) side. Move the rudder stick to the left and right and set the limit position the same as the setting described above.

When setting is complete, the LED will blink 3 times.

3.In this state, move the rudder stick and check if the limit positions are normal. (The servo operating angle moves 1.5 times the movement of the stick.) If there is any offset, press the button switch and repeat setting in both directions.

ESCRIPTION OF

UNCTIONS

Note1: If setting the limit position to 50% or less of the servo operating angle is attempted, an error will occur. When the color of the LED is red, the operating angle is 50% or less. Limit setting is possible at the position at which the LED lights blue.

Note2: Before setting the limit position for the ﬁrst time, disconnect the linkage rod from the horn to protect the rudder linkage.

4. F3C/3D mode setting [LED 4 blinks]

Sets the gyro operation mode ( À ight mode). Set the F3C mode when delicate rudder operation is necessary. In the 3D mode, rudder stick operation reacts more sensitively.

Setting

F3C mode*

3D mode

LED state Method of changing gyro operation direction

Blue 4 blinks

Red 4 blinks

1. Press the button and set to the LED fast blinking state. (Fast blinking stops in about 1 second.)

2. When the button is momentarily pressed again in the LED fast blinking state, the setting is switched.

*: Initial setting

5. Response setting [LED 5 blinks]

Sets the helicopter tail response. Generally, the tail response of 3D aerobatic helicopters and small helicopters is fast. Conversely, the tail response of large scale helicopters and tail heavy helicopters is slow. Response setting optimizes control by matching gyro control to the tail response of the helicopter.

• The response can be set in 3 steps. Select the best value by ﬂight adjustment.

Setting

Reference*

Fast

Slow

LED state Method of changing gyro operation direction

Blue 5 blinks

Red 5 blinks

Violet 5 blinks

1. Press the button and set to the LED fast blinking state. (Fast blinking stops in about 1 second.)

2. When the button is momentarily pressed again in the LED fast blinking state, the setting is switched.

*: Initial setting

D ESCRIPTION OF F UNCTIONS

6. Data reset [LED 6 blinks]

Returns the gyro settings to their initial state. After data reset, set each parameter again.

Reset method

1. Press the button momentarily. The LED blinks fast. (Fast blinking stops in about 1 minute.)

2. In the LED fast blinking state, press the button 3 times. The LED color changes to violet and the data is initialized.

The setting item return to the Servo Selection automatically.

The initial states are:

Parameter

1. Servo selection

2. Reverse setting

3. Limit setting

4. F3C/3D mode

5. Response setting

Initial state

Digital 1520μS

Normal

Right, left 420μS

F3C mode

Reference

When returning to the Normal mode at the end of parameters setting, cycle the receiver and gyro power.

ESCRIPTION OF

UNCTIONS

Gyro Sensitivity Setting

The

¿ gure below shows the relationship between the GY520 gyro sensitivity and the transmitter gyro sensitivity channel pulse width.

At the neutral position the sensitivity becomes zero and enters the AVCS mode side at the + pulse width side and the Normal mode side at the - pulse width side. The sensitivity becomes

100% when the pulse change width is 500 ȝ S.

Normal side AVCS side

100%

50%

Sensitivity

-500μS Neutral

Pulse width

+500μS

• The newest FUTABA transmitters with gyro sensitivity setting function make AVCS/Normal mode setting and sensitivity setting easy.

For transmitters without a gyro sensitivity setting function, connect the sensitivity setting connector to a vacant switch channel and set the gyro sensitivity using the END POINT (ATV) function of that channel. At

100% ATV, the sensitivity becomes approximately 100%. (For FUTABA transmitter)

• Optimum sensitivity is the position just before the tail of the helicopter starts hunting. Make adjustments during actual ﬂight.

For a 90 class helicopter, the sensitivity criteria is hovering: 70-100% and idle up: 30-60%. For small helicopters with a high tail sensitivity, the optimum sensitivity of the gyro is a low setting.

The sensitivity adjustment method is different depending on the transmitter used. Refer to the setting examples shown below.

D ESCRIPTION OF F UNCTIONS

When using T14MZ/T12Z/T12FG transmitter

Use the gyro mixing function to set the sensitivity and mode for each condition used.

• Up to 3 sensitivities can be set for each ﬂight condition

[Transmitter Setting]

Set the gyro rate in both directions to 100% at the

END POINT (ATV) setup screen.

Call the GYRO screen and set the sensitivity and mode for each condition.

Setting example;

• Adjust 70% (both AVC and NOR) as the reference when hovering and

40% (both AVC and NOR) as the reference during ﬂight.

The following setting example uses SW-A to switch between

AVCS70% (rate 1) and NOR70% (rate 2).

T14MZ

• Enables only the number of functions used by the current condition.

• Selects the rate switches and sets the ON direction when

2 or more sensitivities are used.

(Normal condition screen)

• Select "GY" as the gyro type.

• Mode selection (AVCS or NOR) and sensitivity adjustment

ESCRIPTION OF

UNCTIONS

T12Z

• Enable only the number of functions you want to use with the current condition. (Figure below: 1 rate and 2 screens)

When using 2 or more sensitivities, perform switch selection and ON direction setting at each rate screen.

(Normal condition screen)

• Selects "GY" as the gyro type.

• Mode selection (AVCS or NOR) and sensitivity adjustment

T12FG

• Enable only the number of functions you want to use with the current condition. (Figure below: 1 rate and 2 screens)

When using 2 or more sensitivities, perform switch selection and ON direction setting at each rate screen.

(Normal condition screen)

• Selects "GY" as the gyro type.

• Mode selection (AVCS or NOR) and sensitivity adjustment

D ESCRIPTION OF F UNCTIONS

When using a T10C/T9CS/T7C transmitter

Use the gyro mixing function to set the sensitivity for each condition.

[Transmitter setting]

Set the 5ch (gyro sensitivity) rate of both directions to

100% using the END POINT setup screen.

Call the GYRO SENS setup screen and set the sensitivity for each condition.

Setting example;

• Adjust 70% (both AVC and NOR) as the reference when hovering and

40% (both AVC and NOR) as the reference during ﬂight.

The following setting example shows the sensitivity set to

AVCS70% for normal conditions and to AVCS40% for other conditions.

T10C

• Sets the function to "ACT".

• Sets the gyro mode to "GY".

• S e t s t h e m o d e ( AV C o r

NOR) and sensitivity of each condition

• Selects "Cond." as the switch.

ESCRIPTION OF

UNCTIONS

T9CS

• Sets the function to "ACT".

• Sets the gyro mode to "GY".

• Selects "Cond." as the switch.

• S e t s t h e m o d e ( AV C o r

NOR) and sensitivity of each condition

T7C

• Sets the function to "ACT".

• Sets the gyro mode to "GY".

• Selects "E" as the switch.

• S e t s t h e m o d e ( AV C o r

NOR) and sensitivity of each condition

D ESCRIPTION OF F UNCTIONS

When using a T6EX transmitter

Use the gyro mixing function to set the sensitivity of each direction of the gyro switch.

[Transmitter setting]

Set the 5ch (gyro sensitivity) rate of both directions to

100% using the EPA setup screen.

Call the GYRO setup screen and set the sensitivity for each direction of the switch.

Setting example;

• Adjust 70% (both AVC and NOR) as the reference when hovering and

40% (both AVC and NOR) as the reference during ﬂight.

The following setting example shows the sensitivity set to

AVCS70% for up side and to Normal70% for down side.

T6EX

• Sets the function to "ON".

(Up side) (Down side)

• Sets the mode (AVC or Normal) and sensitivity of each direction of the switch

Transmitter rate setting

-100% 0% +100%

GY520

Operation

Mode

Gyro

Sensitivity

100%

Normal

Mode

AVCS

Mode

100%

ESCRIPTION OF

UNCTIONS

T9Z (world champion model) transmitter

Use the GYRO SENSE function to set the mode and sensitivity for each condition used.

• Two sensitivities can be used for each ﬂight condition.

[Transmitter setting]

Set the 5ch (GYR) rate of both directions at the ATV setup screen.

Call the GYRO SENS screen.

Select "DUAL" mode (DUO).

Set the sensitivity by adjusting the "GAIN1" and

"GAIN2" rates.

Transmitter rate setting

GAIN1

GAIN2

0% 50% 100%

GY520

Operation

Mode

Gyro

Sensitivity

100%

Normal

Mode

AVCS

Mode

100%

For steps 2-4, see the setting example on the next page.

D ESCRIPTION OF F UNCTIONS

Setting example;

• T h e e x a m p l e s h o w n b e l o w u s e s a s w i t c h t o s w i t c h t h e

AVCS70%(GAIN1) and Normal70%(GAIN2) modes and sensitivities at each normal condition.

• Selects "DUAL" mode.

• Sets the sensitivity.

Switches GAIN1 and GAIN2 by switch.

• Adjust the setting of each condition during hovering and ﬂight by making the values shown below the reference. (Example when used by switching the AVCS and Normal mode sensitivities by switch)

Sensitivity

Switch Sensitivity when hovering

Sensitivity in flight

AVCS side

GAIN1

85% 70%

Normal side

GAIN2

15% 30%

（ Actual sensitivity ） 70% 40%

The GAIN1 and GAIN2 set values are the AVCS mode setting above

50% and the Normal mode setting below 50%.

ESCRIPTION OF

UNCTIONS

When transmitter without dedicated mixing used

When the transmitter does not have a dedicated mixing function for GY gyro, use a vacant channel to set the sensitivity.

Connect the GY520 gyro sensitivity input to the corresponding channel.

Adjust the AVCS side and Normal side sensitivity using the

END POINT (ATV) function.

[Transmitter setting]

Call the END POINT (ATV) function.

Set the sensitivity by adjusting the rate of the sensitivity setting channel.

(Pushed back) (Pulled forward)

End point (ATV) rate

GY520 operation mode

100%

Normal mode

AVCS mode

100%

Gyro sensitivity

100% 0% 100%

* However, sensitivity setting by END POINT (ATV) function may have a range over which setting is impossible. Check the END POINT (ATV) setting range of the transmitter used.

* The actual sensitivity of the GY520 depends on the transmitter used.

Setting example;

• Adjust 70% (both AVC and NOR) as the reference when hovering and

40% (both AVC and NOR) as the reference during ﬂight.

R EFERENCE

EFERENCE

Speciﬁcations

* Speciﬁcations are subject to change without prior notice.

GY520 Ratings

• Yaw-axis stabilizer for helicopter (rate gyro)

• Control system: Advanced PID control

• Sensor: MEMS vibrating structure gyro

• Angular velocity range: ±800 deg/sec

• Operating voltage range: DC 3.8V to 6.0V

• Current drain: 40mA (excluding a servo)

• Operating temperature: -10°C - +45°C

• Dimensions: 20.8 x 20.8 x 11mm

• Weight: 8g

(Suggested servo for use with your GY520)

S9254 Ratings

(Digital 1520μS servo)

• Dimensions: 40 x 20 x 36.6mm

• Weight: 49g

• Speed: 0.06sec/60° (at 4.8V)

• Torque: 3.4kg·cm (at 4.8V)

BLS254 Ratings

(Digital 1520μS/brushless servo)

• Dimensions: 40 x 20 x 36.8mm

• Weight: 61g

• Speed: 0.06sec/60° (at 4.8V)

• Torque: 3.8kg·cm (at 4.8V)

S9257 Ratings

(Digital 1520μS servo for EP helicopter)

• Dimensions: 35.5 x 15 x 28.6mm

• Weight: 26g

• Speed: 0.08sec/60° (at 4.8V)

• Torque: 2kg·cm (at 4.8V)

S9256 Ratings

(Digital 760μS servo)

• Dimensions: 40 x 20 x 36.6mm

• Weight: 57g

• Speed: 0.06sec/60° (at 4.8V)

EFERENCE

• Torque: 3.4kg·cm (at 4.8V)

BLS251 Ratings

(Digital 760μS/brushless servo)

• Dimensions: 40 x 20 x 36.8mm

• Weight: 61g

• Speed: 0.06sec/60° (at 4.8V)

• Torque: 3.8kg·cm (at 4.8V)

R EFERENCE

Repair Service (in U.S.A.)

If any dif ¿ culties are encountered while setting up or operating your GY520, please consult this instruction manual ¿ rst. For further assistance you may also refer to your hobby dealer, or contact the Futaba Service Center at the web site, fax or telephone number below: https://www.futabausa.com

Phone:1-256-461-9399 FAX:1-256-461-1059

If you are unable to resolve the issue, pack the system in its original container with a note enclosed and a thorough

, accurate

description of the dif

¿ culty. Include the following in your note:

• Symptoms (Including when the problem occurred)

• System (Transmitter, Receiver, Servos and model numbers)

• Model (Model name)

• Model numbers and quantity

• Your Name, Address and Telephone number

Send the respective items to the authorized Futaba Service

Center address below:

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:DOO7ULDQD+Z\

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