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Futaba GYA441 Manual

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AVCS 100%
NORMAL 100%NORMAL 50%
LIMIT
GAIN
0%
AVCS 50%
Servo
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Gyro Sensitivity and AVCS Switching
AVCS / NORMAL Modes
Servo Operation on the Ground
Link the servo in accordance with the kit instruction manual.
Adjust the linkage rod so that the trim amount is as small as pos-
sible.
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, re-
spectively. The check of operational mode is discriminable in the
display color of LED. The stability of digital-servo mode of a flight
increases in order to perform a high-speed control action.
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Adjust the gyro sensitivity at the transmitter.
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1
Use the aileron/elevator selector switch to select aileron or
elevator. (Aileron: AIL Elevator: ELE)    
2
Turn on your transmitter's power. Set the gyro sensitivity to about
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.
3
Turn on the receiver power. When the gyro starts the LED flashes
green and initialization begins. When initialization ends the
servo performs reciprocating operation to the left and right (a little).
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.
1
Fly the aircraft and trim it by turning off the gyro at 0% sensitivity
or in the
NORMAL
mode. After trimming, switch the gain switch
between 0% sensitivity (or
NORMAL
mode) and the AVCS mode three
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 flight.
2
Adjust the gyro sensitivity so that hunting (deflection of the
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.
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 main-
tained. 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 spe-
cial attention to the elevator axis. To be safe, switching to the
NORMAL mode when taking off and landing is recommended.
If the stick is moved when the airplane is on the ground, the ser-
vo 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 neu-
tral position.
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 adjust-
ing the end point rate. If the transmitter has a gyro sensitivity
setting mixing function, the sensitivity setting is performed di-
rectly.
When the remote gain function is not used, the clockwise di-
rection 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
figure below. The sensitivity becomes zero between end point
-40% to +40% and becomes 100% at end point 100%.
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 transmit-
ter) 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 re-
mote gain. Because, neutral memo-
ry cannot be performed. And taking
off and landing being dangerous.
0%
-40%
+40%
50%
50%
100%
100%
+70% +100%
-70%-100%
End point rate
Gain
NORMAL side（LED : GREEN）
AVCS side（LED : RED）
GAIN 0％
AVCS
NORMAL
When AVCS is used we
recommend that the
sensitivity CH be set to
the 3-position.
AVCS 100%
NORMAL 100%NORMAL 50%
LIMIT
GAIN
0%
AVCS 50%
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)
AVCS
When GYA441 used at the ailerons of a shoulder wing aircraft
NORMAL
Left rudder applied
When tilted by left aileron
Flies tilted to the left as long as
right aileron is not applied.
The airplane itself is stable and tries
to return to level flight.
When tilted by left aileron
Left rudder applied
Aileron direction is forcefully
maintained level.
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Aircraft gradually tilts to the left.
<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 direc-
tion of the elevator servo.
Mount the servos as left and
right objective linkage.
＜Limit trimmer Adjustments＞
It adjusts to the
maximum operation of
linkage.
（
Aileron
）
Aileron stick right
/left to full
D/R (UP side)
LIMIT
GAIN
Limit trimmer
Adjustments
Digital
Analog
Analog
5
In the case of aileron control, switch the gyro direction switch and
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, flight
will become impossible so make the settings positively.
Gyro sensitivity zero --- LED OFF
AVCS side --- LED red
NORMAL side --- LED green
LIMIT
GAIN
0%
NORMAL 30%
＜
A gain trimmer's work
＞
First,we recommend to
start with NORMAL30%.
＜
GAIN CH
＞
LIMIT
GAIN
Digital-servo mode:
LED Orange
Analog-servo mode:
LED Green
Limit position
of digital servo
Limit position
of analog servo
[Limit position]
Selection of digital/analog servo
is chosen towards a trimmer turning.
LIMIT
GAIN
70%
100%
100%
130%
130%
When a remote gain function is off, 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 op-
erated, there is a danger that a servo will be destroyed.
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
.
4
Move the stick to the maximum left and right and adjust the gyro
limit trimmer so that the servo operating angle is at the
maximum position at which there is no interference with the linkage.
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Adjust the gyro sensitivity with the GYA441 trimmer.
Do not use the AVCS mode.
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*
In this case,
2
gain setup with a transmitter and
4
limit adjustment
of differing in a procedure are lost. And as shown in a figure, gain is
adjusted of the trimmer of GYA441.
● Trimmer operation
*Make trimmer adjust-
ments gently by using the
included mini screwdriver.
2


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