AVCS GYRO

INSTRUCTION MANUAL
YAW-AXIS STABILIZER FOR MODEL HELICOPTER (RATE GYRO)
Thank you for buying a GY611 AVCS gyro. 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. FOREWORD The GY611 gyro is an AVCS (Angular Vector Control System) rate gyro developed for model helicopter competition. [GY611 Features] Super narrow pulse (760s) drive system substantially improves servo response. An S9256 digital servo is used. Microcomputer high-speed arithmetic processing substantially improves gyro response. High resolution 12-bit A/D accurately converts the sensor output to a digital signal. Newest SMM (Silicon Micro Machine) and low-back aeroform case improve vibration resistance and neutral characteristic. Amp mounts an LCD that allows accurate data setting. [S9256] Special servo for the GY611. Compatible with super narrow pulse (760s) drive. High response realized. (0.06 sec/60) Alumite case w/heat sink effectively cools the motor heat.
Always use the special S9256 servo with the GY611.
The GY611 cannot operate with servos other than the super narrow pulse (760s) servo. The servo may be destroyed. 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 clarications should be made.

TABLE OF CONTENTS

FOR SAFETY Meaning of Special Markings ---------------------------- 4 Mounting/Operating Precautions ------------------------ 4 Fuselage Maintenance Precautions ---------------------- 6 S9256 Usage Precautions --------------------------------- 7 BEFORE USE Set Contents ------------------------------------------------ 8 AVCS Gyro ------------------------------------------------- 9 DATA SETTING Name and Function of Each Part ----------------------- 12 LCD Display and Edit Keys ----------------------------- 13 Function Map ---------------------------------------------- 14 GY611 Functions Setting -------------------------------- 15 Remote Gain Function ----------------------------------- 21 Initialization ----------------------------------------------- 30 INSTALLATION AND ADJUSTMENT Installing to Fuselage ------------------------------------- 32 Flight Adjustments ---------------------------------------- 37 REFERENCE Specications ---------------------------------------------- 40 Denition of Abbreviations ------------------------------ 41 GY611 Parameters Sheet -------------------------------- 42

FOR SAFETY

To ensure safe use, observe the following precautions.
Meaning of Special Markings

Mark Meaning

Pay special attention to the safety at the parts of this manual that are indicated by the following marks.
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 supercial 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:

; Prohibited

; Mandatory

Mounting/Operating Precautions
Insert the connectors fully and rmly.
If a connector works loose due to vibration during ight, control may be lost and result in a dangerous situation.
Always use the GY611 with a PCM proportional system.
Using the GY611 with an FM proportional system, when noise enters, the wrong neutral position may be memorized.
Always use the accessory sensor tape to install the sensor 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.
When mounting the sensor, provide a little surplus so that the sensor connection cables are not too taut.
If the sensor 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.
Mount the sensor and control amp so that metals or other conductive objects do not touch these cases.
The GY611 uses a conductive resin case to reduce electromagnetic interference. Because the surface of the case is conductive, metal objects may cause a short circuit.

Mount the sensor and servo at least 2cm apart. When using a GV-1 governor, mount the sensor and GV-1 amp at least 5cm apart. When using the GY611 with a motor-driven helicopter, mount the sensor and drive motor at least 10cm apart.
Noise from the servo motor, GV-1 amp and drive motor may cause the performance of an erroneously operated gyro to drop.
Precautions When Turning on the Power Switch During initialization, the message --Hello-- appears on the GY611 LCD screen.
Do not move the helicopter until this message disappears (in about 3 seconds). Also, do not move the transmitter rudder stick from the neutral position during this period. Always check the direction of operation of the servos.
If you attempt to y the model when a servo operates in the wrong direction, the fuselage will spin in a xed direction and enter an extremely dangerous state.
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 GY611.
Avoid sudden temperature changes.
Sudden temperature changes will cause the neutral position to change. For example, in the winter, do not y immediately after removing the model from inside a heated car and in the summer, do not y 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.
Check the remaining receiver/gyro/servo nicd battery operating time during the adjustment stage and decide how many ights are remaining. Never use the transmitter rudder trim in the AVCS mode.
When the rudder is trimmed during ight, the neutral position will change.
When using the GY611 in the AVCS mode, set revolution mixing to OFF.
Fuselage Maintenance Precautions
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.
Always perform proper maintenance for ultimate performance.
The rigidity of the fuselage tail has a large effect on gyro performance.
Make the fuselage vibration as small as possible.
Fuselage vibration has an adverse affect on gyro operation.

S9256 Usage Precautions

Do not use the S9256 with applications other than the GY611 gyro.
The S9256 is designed to be used with the GY611 only, and will not operate in other applications. Trouble may also occur.
Immediately after ight, do not touch the S9256 case.
The heat sink section of the case is extremely hot, and may cause burns.
When mounting in the fuselage, install the S9256 so that it does not touch the servo case and metal parts of the helicopter frame.
The middle case has an aluminum heat sink construction, and will generate a large amount of noise if touched. In this case, it will become impossible to receive and is extremely dangerous. Current Drain: The S9256 is designed to be used with the GY611 gyro only, especially to operate at high speed. Therefore, the servo starts, a correspondingly large current ows and the current drain is, therefore, large. Constantly pay attention to the remaining capacity of the Nicd battery and decide the number of safe ights. Always pay attention to the following points: Always use an Nicd battery. A dry cell battery will not display the spspecied performance. When using the S9256 in a system with a battery fail safe function, the cutoff voltage is set to a high value. Shortening of the ight time due to this must be included in calculation. Install the servo so that it does not get caught on the push rod or does not loosen even when operated over its full travel. If unreasonable force is applied, the current drain will increase tremendously and shorten the life of the servo and accelerate battery consumption.

BEFORE USE

Set Contents
After unpacking the GY611 set, rst check if the following parts are provided: GY611 control amp (x1)

The tail remains extremely stable.

Forward Side wind

Differences in rudder control method The following describes the differences between conventional gyro and AVCS gyro rudder control. The conventional gyro sends the rudder control signals from the transmitter to the rudder servo and starts to move the tail. When the tail moves, the gyro detects this movement and generates a signal to stop it. If the tail continues to move even in this state, a rudder con-
BEFORE USE trol signal larger than the signal from the gyro must be applied from the transmitter. That is, the difference between the rudder control signal from the transmitter and the control signal that attempts to stop this from the gyro becomes the actual amount of movement of the tail. Ordinarily, the rudder control signal is amplied several times over by the gyro amp and is balanced with the gyro control signal so that the transmitter can be used at the normal steering angle. The AVCS system uses a different rudder control method. As described in the preceding section, it has additional functions that "attempt to return movement by external force to the original position" and that generate an angular velocity proportional to the rudder control signal. That is, it functionally controls the speed of rotation of the tail. The original AVCS (Angular Vector Control System) came from this.
In the AVCS mode, when the transmitter rudder stick is moved when the helicopter was stopped, the rudder servo controls operation until the tail reaches the specied rotational speed. Trim deviation of the rudder control signal also becomes a signal that causes the tail to turn so that even a little trim deviation causes the tail to move. Therefore, the rudder trim is made the same in all flight states and must match the neutral reference signal at the gyro. The method of reading the rudder neutral signal at the gyro will be described separately. Since the rudder mixing signals from the transmitter also become a tail rotation signal, all the rudder mixing functions must be disabled. In the AVCS mode, the gyro automatically trims the rudder so that linkage changes cannot be veried. Initially, the GY611 trims the rudder by ying in the Normal mode to take the rudder linkage neutral position. This centers the linkage. At this time, this rudder neutral reference point is read to the GY611.
Giving the gyro the rudder neutral reference signal and performing tail operation by referring to this signal in the AVCS mode in this way is how the AVCS system differs from the conventional system.

DATA SETTING

GY611 control amp LCD display
Name and Function of Each Part
Displays the set data. (8 characters x 1 line)
(Input/output terminals) Gyro sensor input Rudder servo output
Used when setting data. Operated by pushing with the accessory mini screwdriver.

Edit keys

(Receiver connectors) Remote gain input Rudder input

LCD contrast trimmer

Allows adjustment of the contrast so that the LCD display is easiest to see. It is adjusted with the accessory mini screwdriver.

GY611 gyro sensor

To control amp
Stick to the body using the accessory sensor tape.
LCD Display and Edit Keys

LCD display

Set data display and operation status monitoring are possible.
Edit keys Setup screen call
The setup screens can be sequentially called with the FUNC+ or FUNC- key. For the order in which the setup screens are called, see the function map.

Data setting

Perform data setting with the DATA+ or DATA- key. When setting a value, the data is increased when the DATA+ key is pressed and is decreased when the DATA- key is pressed. The mode can also be selected using either the DATA+ or the DATA- key.

Function Map

FUNC (-) key
Normal screen display (P15) Power ON

FUNC (+) key

Gyro Reverse (P16) Gyro Gain Adjustment (P16) Rudder Control Gain (P17) Control Delay I (P17) Control Delay D (P17) Gain Tracking (P18) Operation Mode Setting (P18) Flight Mode (P19) AVCS sense (P20) Linkage Limit Setting (P20)
Power on screen display (P15)

GY611 Functions Setting

Power on screen display
When the gyro power is turned on after the transmitter power was turned on, -Hello- blinks for about three seconds to initialize the data inside the gyro. During this period, do not move the transmitter rudder stick or the helicopter. If the transmitter rudder stick or the helicopter is moved by mistake, the rudder neutral data will not be correctly read.

Normal screen display

Actual gain (sensitivity) display Operation mode display N : NOR mode A : AVCS mode : Neutral offset
Power supply voltage display During rudder neutral reset operation, **** is displayed. During rudder servo reset operation by rudder stick, ---- is displayed.

Low battery alarm When the power supply voltage drops to 3.8V or less, LOW Batt is displayed. When this message is displayed, immediately stop use and recharge the Nicd battery.
DATA SETTING Gyro Reverse

Initial value: NOR

Sets the gyro operation direction. NOR or REV can be selected. Set so that when the helicopter is banked right, left correction rudder is applied and when the helicopter is banked left, right correction rudder is applied.

Gyro Gain Adjustment

Initial value: 100%
Adjusts the gyro gain. Setting range is 0 to 120%. Two-point (G:1, G:2) gain adjustment is possible. When A is displayed, the gyro is in the AVC mode and when N is displayed, the gyro is in the NOR mode in accordance with the operation mode setting.
DATA SETTING Rudder Control Gain
Initial value : ACG: 120%, NCG: 130%
Adjusts the rudder stick operation gain. Setting range is 10% to 250%. AVCS and NOR mode gain can be set independently. In the AVCS mode, ACG is displayed and in the NOR mode, NCG is displayed. The display automatically changes to A or B according to the direction of the rudder stick and the gain of each direction can be set. This function is used when tracking rudder operation gain between the AVCS and NOR modes.

Control Delay I

Initial value : 0%
Sets the delay when the rudder stick was pushed operated. Setting range is 0 to 100%. Rudder stick left and right can be set separately. Control Delay D
Sets the delay when the rudder stick was returned. Setting range is 0 to 100%. Rudder stick left and right can be set separately.
DATA SETTING Gain Tracking

Initial value : +0%

Adjusts left and right tail braking tracking. Setting range is -20% to +20%. For example, when there is a sense of hunting when stopping left pirouette or the helicopter drifts when stopping right pirouette, shift Trk in the + direction. In the opposite case, shift Trk in the - direction.

Operation Mode Setting

Initial : CMT
Sets the gyro operation mode. Settings are NOR, AVC, and CMT. In the NOR mode, both G1 and G2 operate in the AVCS mode. In the CMT mode, G1 operates in the AVCS mode and G2 operates in the NOR mode. In the NOR mode, the GY611 operates the same as an ordinary gyro. In the AVC mode, the GY611 always operates in the AVCS mode. In the CM mode, the GY611 can be used in both the AVCS and NOR modes.

DATA SETTING Flight mode

Initial value : F3C
Switches the ight mode. Settings are F3C or 3D. The F3C mode emphasizes tail suppression and stop. The 3D mode slightly sacrices tail suppression and stop, but lets you control pirouette speed completely proportional with the rudder stick operation amount and is suitable for 3D ight. <3D mode steering angle setting>

During 3D mode setting, the transmitter rudder steering angle is set to 100% and approximately 500/second high pirouette speed. Therefore, initially set the transmitter rudder steering angle to a low value so that the tail can be safely controlled. (About 70%) The pirouette speed is proportional to the rudder steering amount without regard to the gyro sensitivity.

DATA SETTING AVCS Sense

Initial value : 100%
Adjusts the rudder control characteristic in the AVCS mode. Setting range is 50 to 150%. Check the rudder operation feeling and stopping characteristic and adjust. When the ight mode (page 19) is the 3D mode, this value becomes the pirouette standard value.

Linkage Limit Setting

Sets the rudder servo travel limit. Operate the rudder stick and adjust the rudder servo travel limit by pressing the +/- key so that the servo moves to the maximum linkage position. Use the same procedure to set both the left and right limits. When setting, move the servo substantially so that the rudder angle automatically becomes 200% and limit setting is easy. A or B is displayed for the right and left directions.
Note: When this screen is displayed, the GY611 does not operate as a gyro. To check operation, return to the initial screen, etc.

Remote Gain Function

The remote gain function lets operator perform AVCS mode and Normal mode sensitivity adjustment and operation mode switching from the transmitter. The channel used here is called the "remote gain channel".
(Remote Gain Function) Transmitter
Gain/Mode Selection Gain Settings
CH5 switch Idle-Up switch (T9Csuper) Flight condition (T14MZ, T9Z) End Point (ATV) function Gyro mixing (T14MZ/T9Z/T9Csuper)

Receiver GY611

Mode Settings
Normal mode (NOR) AVCS mode (AVC) Selectable mode (CMT)

Gain Settings

Gyro Gain Adjustment
Remote Gain Channel (CH5, etc)
DATA SETTING When Using a T9Z World Champion Model Transmitter Gyro Sense Mixing
The Gyro Sense Mixing (GYR) function lets operator perform two-point gain adjustment at each condition. Set the sensitivity at all conditions.

[GY611 Settings]

Select the gyro operation mode at the GY611 Mode screen. (AVC, NOR, or CMT)

[Transmitter Settings]

ATV function: Adjust both the RATE A and RATE B rates to 100% at the transmitter 5ch(GYR) ATV function setup screen. Gyro Sense Mixing function: 1. Select the Dual Mode (DUO) at the transmitter Gyro Sense Mixing setup screen. 2. Set the GAIN1 and GAIN2 gains. (The following page shows a setting example in the CMT mode.)

Adjust the gyro gain at the Gyro Mixing setup screen at each condition. The following shows a setting example in the CMT mode. Activate the function. Select the desired mode (AVCS or Nor) and adjust the gyro sensitivity.
Select the selector switch. Set the type of gyro to GY.
Use the following values as the sensitivity setting standard: Selector switch
Rate1 setting Rate2 setting

Hovering

40% AVCS side

40% 40%

Actual gain: 70%
DATA SETTING When Using a T9Csuper Transmitter [GY611 Settings]
The Gyro Mixing (GYRO SENS) function lets operator perform a gain adjustment at each condition switch position. Select the gyro operation mode at the GY611 Mode screen. (AVC, NOR, or CMT)
Gyro Mixing function: 1. Activate the function at the transmitter Gyro Mixing (GYRO SENS) setup screen. 2. Select the condition switch (Cond.) for the sensitivity selection. 3. Set the NORM, IDL1, IDL2, IDL3, and HOLD gains. (The following page shows a setting example in the CMT mode.)
[Relationship between transmitter and gyro setting] AVC Transmitter settings: NOR 100% 0% 100% GY611 mode settings: Normal mode NOR: AVCS mode AVC: CMT: Normal mode AVCS mode 0% 100%
Adjust the gyro gain at the Gyro Mixing (GYRO SENS) setup screen. The following shows a setting example in the CMT mode. Activate the function. Set the type of gyro to GY.
Select the desired mode (AVC or NOR) and adjust the gyro sensitivity. Set the selector switch to Cond.
Use the following values as the sensitivity setting standard: Hovering: 70% (AVC or NOR mode) Flight: 40% (AVC or NOR mode)
DATA SETTING When Using a Transmitter End Point (ATV) Function
The End Point (ATV) function lets operator perform a gain adjustment at each selector switch position.
End Poin (ATV) function: Set the rates at the transmitter remote gain channel (CH5, etc.) End Point (ATV) function. The gain display indicates the actual gain at the GY611 normal screen display. The following shows the relationship between transmitter and gyro setting.
[Relationship between transmitter and gyro setting] Transmitter settings: Switch Switch Front side End Point (ATV) rates Forward side 90% 0% 90% GY611 mode settings: Normal mode NOR: AVCS mode AVC: CMT: Normal mode AVCS mode (G2) (G1) 0% 100%
DATA SETTING When Using a GY611 Gyro Gain Adjustment Function [Transmitter Settings] [GY611 Settings]
Adjust both the End Point (ATV) rates to 90% at the transmitter remote gain channel (CH5, etc.) End Point (ATV) function. Operation Mode Setting function: Select the gyro operation mode at the GY611 Mode screen. (AVC, NOR, or CMT) Gyro Gain Adjustment function: Set the G:1 and G:2 gains at the GY611 G:x screen.

[Relationship between transmitter and gyro setting] Transmitter settings: End Point (ATV) rates Switch Forward side 90% (Fixed) Switch Front side 90% (Fixed)

GY611 mode settings:

Normal mode NOR: AVCS mode AVC: CMT: Normal mode AVCS mode (G2) (G1) GY611 adjusting range: 100% 0% 100%

Initialization

AVCS mode operation is based on the rudder neutral data stored in the GY611. When using the GY611 for the rst time, or when the internal reference data and the transmitter neutral position differed when the transmitter neutral trim was adjusted, etc., the rudder neutral data must be read again. [At power ON] When the power switch is turned on, the GY611 automatically obtains the reference signal for AVCS function correction and initializes itself.
When the power was turned on in the Normal mode, the rudder neutral position already memorized in the GY611 is not updated. When the power was turned on in the AVCS mode, the rudder signal at that point is memorized and updated.
Precautions When Turning on the Power Switch During initialization, the message -Hello- appears on the GY611 LCD screen.
Do not move the helicopter until this message disappears (in about 3 seconds). Also, do not move the transmitter rudder stick from the neutral position during this period.
DATA SETTING [During use] When the rudder was re-trimmed in the Normal mode and the new trim position also affects the AVCS mode, the rudder trim neutral position must be memorized in the GY611. Re-reading method In this case, quickly switch (interval of within 1 second) the transmitter remote gain switch between the Normal and AVCS sides at least three times and switch the AVCS side at the neutral trim position set in the Normal mode. This memorizes the new rudder neutral position in the GY611. When the transmitter has a function that allows trim setting for each ight condition, such as the T9Z and T14MZ, the AVCS mode trim position is fixed and this operation is unnecessary.
Never use the transmitter rudder trim in the AVCS mode.
When the rudder is trimmed during ight, the neutral position will change.
When using the GY611 in the AVCS mode, set revolution mixing to OFF. When the rudder neutral position was changed by the linkage, the rudder neutral position in the AVCS mode must always be reread before use.

3 Gyro operation mode selection
When using the gyro only in the NOR mode, select NOR. When using the gyro only in the AVCS mode, select AVCS. When using the gyro in both the AVCS and NOR modes, select CMT.
* However, when using the gyro in the CMT mode, since the AVCS and NOR mode gain must be set during hovering and in ight, a transmitter with a gyro mixing function (T14MZ, T9Zwc series, T9Csuper series, etc.) is necessary. For a description of transmitter setting, see the remote gain function (p21).
4 Rudder servo linkage check
Make the initial linkage connections in the NOR mode. In this case, make adjustments mechanically and make minimum trimmer adjustments at the transmitter.
In the NOR mode, make the following linkage checks:
In the rudder neutral position, connect the linkage at the position at which the servo horn and control wire are perpendicular. Perpendicular Control wire 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 with the transmitter reverse function.
5 Gyro operation direction check
If the rudder servo moves to the left when the nose of the helicopter moves to the right, the gyro direction is correct. If the rudder servo moves to the right, switch the direction using the GDir screen.
If you try to fly the helicopter while the gyro direction is incorrect, when the rotor rotates clockwise, the helicopter nose will yaw to the left and cause an extremely dangerous situation.

6 Limit setting

Move the rudder stick to the left and right and perform adjustment at the Lmt screen so that the servo operation angle becomes the maximum value at which the servo horn does not strike the linkage.
* When ying, the servo horn does not move beyond this set angle, thus protecting the linkage. However, if the limit setting is too low, gyro performance will be effected. * In this mode, only the stick operates; the gyro does not operate.

Never move the helicopter or rudder stick during the approximately three seconds that the -Hello- display blinks.
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 veried. First, perform rudder neutral adjustment in the Normal mode. Move the transmitter trim lever and reset the neutral position. When the rudder servo neutral position has changed considerably, readjust the linkage.
When the transmitter rudder trim was adjusted, the rudder neutral data must be read to the GY611. Therefore, always perform the following operations:
Switch the transmitter sensitivity switch quickly (internal of within 1 second) between AVCS and Normal at least three times. "****" is displayed on the LCD screen to show that data is being memorized. During this operation, never move the transmitter rudder stick from the neutral position for at least 1 second immediately after switching the switch in the state in which the model is on the ground. Memorization and updating is executed only when the sensitivity switch is in the AVCS mode position.
Set the sensitivity to the position at which hunting does not occur during hovering and ight.
When the helicopter tail hunts, set the gyro sensitivity to a lower value. When adjusting the gyro sensitivity, increase and decrease the sensitivity gradually while checking. When the sensitivity is low even when the gyro sensitivity is 100%, make the rudder servo horn position longer. The sensitivity can be increased (up to 120%) at the GY611 gyro gain adjustment screen, or by increasing the End
Point (ATV) amount of the transmitter sensitivity setting channel. The actual sensitivity can be checked on the GY611 normal screen display.
Adjust the hovering and ight rudder effect using the transmitter's D/R or AFR function.
Do not adjust with the End Point (ATV) function. If the End Point (ATV) function is used, trimming may change.

(If necessary)

When you sense a difference in the rudder effect between the AVCS and Normal modes, adjust using the GY611 rudder control gain.
Adjustment method When the rudder effect in the AVCS is different from the rudder effect in the Normal mode after adjustment was performed using the transmitter's D/R or AFR function, adjust the difference using the NCGx parameter.
Adjust the left and right pirouette stopping state by control delay and tracking.
Adjustment using the delay function of the T14MZ and T9Z transmitter is also possible. Since the gyro gain also has a large effect on the stopping state, make this adjustment after adjusting the sensitivity.

Adjust the rudder operation feel using the GY611 AVCS sense in the AVCS mode. (Steering angle, neutral suppression, and pirouette stopping)
When you want to use rudder mixing in the Normal mode, set the transmitter so that rudder mixing is applied only during Normal mode operation. Never use rudder mixing in the AVCS mode.

REFERENCE

Specications
GY611 Ratings Yaw-axis stabilizer for helicopter (rate gyro) Display device: 8-character dot matrix liquid crystal display Operating voltage range: DC 3.8V to 6.0V Current drain: 70mA (@5.0V, including sensor) Dimensions: 57 x 32 x 15mm (amp), 30 x 30 x 18mm (sensor) Weight: 34g (amp) + 30g (sensor) S9256 Ratings Dimensions: 40 x 20 x 36.6mm Weight: 57g Speed: 0.06sec/60 (at 4.8V) Torque: 3.4kgcm (at 4.8V)
* Specications are subject to change without prior notice.
Denition of Abbreviations
The following defines the abbreviations and symbols used in this manual in alphabetical order. The function names are given on the description pages.
3D 3D mode. p19 GYRO SENS(E) T9C, T9Z gyro sense mixing.
ACGA/B Rudder control gain (AVCS) p17 AFR AFR function. ATV ATV function. Steering angle adjustment function. AVC AVCS mode. AVCS AVCS system. AVCS mode. AVS AVCS sense. p20

Hello High IDLE INH

Power on screen display. High side. Transmitter power OFF state. Use inhibited state.
Normal/AVC switching mode. Control delay. p17 Control delay. p17 Dual rate function. T9Z dual gain control mode.

D1DA D1IA D/R DUO

Liquid crystal display screen. LmtA/B Linkage limit setting. p20 Low Low side. LOW BAT Low battery error display. Operation mode setting. p18
End Point Steering angle adjustment function. F3C Fmod F3C mode. p19 Flight mode. p19 Gyro gain 1 side. p16 Gyro gain 2 side. p16 Gyro reverse. p16 T14MZ gyro sense mixing.
NCGA/B Rudder control gain (Normal) p17 NOR Normal mode. Normal side.

REV Trk

Reverse side. Gain tracking. p18

G:1A/N G:2A/N GDir Gyro

GY611 Parameters Sheet
Helicopter: Date: Parameter GDir G:xx Initial value

NOR G:1 G:2

ACGA ACGB NCGA NCGB

* Copy and use.

Set value

Remarks

NOR/REV 0-120% 0-120%
10-250% 10-250% 10-250% 10-250%
Gyro Reverse Gyro Gain Adjustment

100% 100%

120% 120% 130% 130%

ACGx,NCGx D1Ix

Rudder Control Gain Control Delay I

D1IA D1IB D1DA D1DB

0% 0% 0% 0% +0% CMT F3C 100%
0-100% 0-100% 0-100% 0-100% -20-+20% CMT/NOR/AVC F3C/3D 50-150%

D1Dx Trk

Control Delay D Gain Tracking

Fmod AVS

Flight Mode AVCS Sense LmtA LmtB
FUTABA CORPORATION Makuhari Techno Garden Bldg., B6F 1-3 Nakase, Mihama-ku, Chiba 261-8555, Japan Phone: (043) 296-5119 Facsimile: (043) 296-5124