FUTABA GY430 Instruction Manual Download Page 2

Adjustments

Flight Adjustments

AVCS / NORMAL Mode

● A trimmer's operation

Since the trimmer is small and delicate, operate 

it by gently using the provided mini screwdriver.

Setup before a flight [ Remote gain use ]

Adjusting gain with the transmitter.

When S.BUS connection or the gyro gain CH of the port 2 of a 

gyro and a receiver is connected.

1

Set the servo selection switch to the setting for your tail rotor 

servo. See chart below. 

2

Set up your transmitter by following the directions in the 

manual.   Gyro gain is set up to 50% by AVCS.  Please refer to 

the graph, AVCS, NORMAL or when unclear.  It judges by the 

LED on the GY430.     AVCS: Red  NORMAL: Green

3

Receiver ON → The GY430 requires 3-5 seconds to initialize 

when the power is turned on. Do not move the helicopter and 

do not move the 

rudder

 stick during this initialization or the 

gyro may not initialize properly. Once the initialization process 

has been completed the 

rudder

 servo will move several times 

indicating that the GY430 is now ready for flight. If the neutral 

has shifted, LED will blink orange. In that case, it reboots.

4

Move the rudder stick to the left and right and make adjustments 

with the limit trimmer. Adjust for maximum travel, making sure the 
servo horn doesn't hit the linkage.

 [ Remote gain not use ]

Adjusting gain with the GY430 trimmer.

When not using an S.BUS connection and port 2 is not connected.

 

In this case, a limit trimmer is automatically changed by the gyro 

gain setting trimmer. A limit is fixed by 50 degrees of right and 

left.

Adjust the transmitter and gyro while repeatedly taking off and 

landing and with the aircraft on the ground. 

Transmitter adjustments must not be made while flying 

because it is dangerous.

1

Set the sensitivity to the position at which hunting does not 

occur during hovering and flight.

2

Adjust the hovering and flight 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.

AVCS 100%

NORMAL 100%

NORMAL 50%

LIMIT

GAIN

0%

AVCS 50%

A gain trimmer's work

GAIN CH

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 re-

turned 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 flight, the 

gyro constantly monitors movement of the tail and controls the servo 

so that movement of the tail is stopped.

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.

NORMAL mode sends control signals to the rudder servo only 

when the tail of the helicopter moves. When the tail stops mov-

ing, the control signal from the gyro becomes zero. Conversely, 

the AVCS mode continues to send control signals to the servo 

even when the tail of the helicopter stops moving. The following 

sequentially describes the NORMAL mode and the AVCS mode.

Operation of NORMAL mode

Basic operation is described by considering the case when the 

helicopter is hovering under cross-wind conditions. With a nor-

mal mode, when the helicopter encounters a cross-wind, the 

force of the cross-wind causes the tail of the helicopter to drift. 

When the tail drifts, the gyro generates a control signal that stops 

the drift. When the tail stops drifting, the control signal from the 

gyro becomes zero. If the cross-wind continues to cause the tail 

to drift in this state, the "stop" operation is repeated until the tail 

faces into the winds. This is called the "weathervane" effect.

Operation of AVCS mode

Conversely, with an AVCS mode, when the helicopter encoun-

ters a cross-wind and the tail drifts, a control signal from the gyro 

stops the drift. At the same time, the gyro computes the drift an-

gle and constantly outputs a control signal that resists the cross-

wind. Therefore, drifting of the tail can be stopped even if the 

cross-wind continues to effect the helicopter. In other words, the 

gyro itself automatically corrects(auto trim) changes in helicopter 

tail trim by cross-wind. Considering operation of an AVCS mode, 

when the tail of the helicopter rotates, the servo also rotates in 

accordance with the angle of rotation of the tail. When the tail 

stops rotating, the servo judges that it has stopped in that posi-

tion. This is the auto trim function.

In 

AVCS

 operation 

mode

In 

NORMAL

 operation 

mode

Hovering in a cross wind.  

The tail will drift.

AVCS

 is working 

properly during 

a cross wind.

If it starts right drift

If it starts right drift

A head turns to a 

direction of movement 

automatically.

If no left rudder input 

is given, the machine 

will drift to the right. 

Cross

wind

Cross

wind

Hovering

High-speed flight

0%

-50%

+50%

50%

50%

100%

100%

+100%

-100%

End point rate

Gain

NORMAL side(LED : GREEN

AVCS side(LED : RED

Please take a look at both the directions for the helicopter as well 

as the transmitter.

LIMIT

GAIN

LIMIT

GAIN

Hold the rudder 

stick full left.

Adjust the left limit 

with the trim.

Hold the rudder 

stick full right.

Adjust the 

right

 

limit with the trim.

Adjust the linkage set 

up to get the 

maximum throw.

Adjust the linkage set 

up to get the 

maximum throw.

Bottom view of the 

tail section with the 

rudder stick full left.

Bottom view of the 

tail section with the 

rudder stick full right.

Adjustment at the limit trimmer

Preflight check

Helicopter is turned to the Left

Rudder operates on the 

Right.

*This check is performed in the state where an engine (motor)

never starting. 

5

If the rudder servo moves to the Right when the nose of the 

helicopter moves to the Left, the gyro direction is correct. If 

the rudder servo moves to the Left, switch the direction using 

the 

Gyro Direction Switch

.

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.

 

First, we suggest to start with AVCS set to 50%.

FUTABA CORPORATION

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

Phone: +81 475 32 6982, Facsimile: +81 475 32 6983

 

©FUTABA CORPORATION     2012, 6   (1)

What is S.BUS?

Unlike conventional radio systems, the 

S.BUS

 system uses 

data communication to transmit control signals from a 

receiver to a servo, gyro, or other 

S.BUS

 compatible device. 

This data includes commands such as “move the channel 3 

servo to 15 degrees, move the channel 5 servo to 30 degrees” 

to multiple devices. The 

S.BUS

 devices execute only those 

commands for their own set channel. For this reason, it can 

be used by connecting multiple servos to the same signal 

line.

* Set the channel at the 

S.BUS servos by using an SBC-1 channel changer or a CIU-2 USB serial interface.

Can also be used together with conventional servos. However, conventional servos cannot be used by the 

S.BUS

 output.

When using servos with a remote battery pack, use 

S.BUS

 Hub with Cable (2-way/remote battery pack use).

  Please refer to the instruction manual of 

S.BUS

 Hub with Cable (2-way/remote battery pack use) for the connection method.

Please turn on the power supply of the transmitter first without fail, and, next, turn on the receiver if you use 

S.BUS

.  Moreover, please use it 

after it confirms the operation without fail. Otherwise, the 

S.BUS 

communication cannot be judged and it is likely to malfunction.

The wiring for the 

S. BUS

 servo is replaced at power supply OFF.  If you replace the wiring in power supply ON, 

S. BUS

 communications 

cannot be judged, and it seems to malfunction.

Similarly the procedure of 

1.3.5 

is followed.

LIMIT

GAIN

1520uS:

 BLS254, BLS257, S9254, S9257,etc.

760uS:

 BLS256HV,BLS251, S9256, S9251    

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