Manual Futaba GY440 (page 2 of 2) (English)

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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.

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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.

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

servo. See chart below.

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 GY440. AVCS: Red NORMAL: Green

Receiver ON → The GY440 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 (a little)

several times indicating that the GY440 is now ready for ﬂight.

If the neutral has shifted, LED will blink orange. In that case, it

reboots.

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.

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Adjusting gain with the GY440 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

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left.

Adjust the transmitter and gyro while repeatedly taking oﬀ and

landing and with the aircraft on the ground.

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because it is dangerous.

Set the sensitivity to the position at which hunting does not

occur during hovering and ﬂight.

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)

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AVCS 100%

NORMAL 100%NORMAL 50%

LIMIT

GAIN

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

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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.

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

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

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

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Operation of AVCS mode

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

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gyro itself automatically corrects(auto trim) changes in helicopter

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

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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

-50%

+50%

50%

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.

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.

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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

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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.

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S.BUS

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S.BUS

communication cannot be judged and it is likely to malfunction.

The wiring for the

S. BUS

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S. BUS

communications

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imilarly the procedure of

1.3.7

is followed.

LIMIT

GAIN

1520uS: BLS254, BLS257, S9254, S9257,etc.

760uS: BLS256HV,BLS251, S9256, S9251

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Futaba GY440 Manual

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