Futaba GYA350 - Manual (Page 2)

G
AIN AND
O
PERATION
M
ODE
S
ETTING
4
The relationship between the travel adjustment functions (ATV,
AFR) settings and gyro gain when the gyro gain is switched using
the transmitter switching channel is shown below.
100%
40%
70%
0%
40%
100%
100%
50%
0%
50%
25%
70% 50% 25%
0%
0%
100%
0%
50%
Operation mode
Transmitter
ATV, etc. setting Gyro gain
(Forward or down)
(Back or up)
Gyro
OFF
Gyro
OFF
NORMAL
OFF
A
VCS
When 100% set When 50% set
(Gyro gain trimmer position)
This figure shows the case
when the gain setting channel
reverse function is set to Nor-
mal. When this function is set to
Reverse, the switch directions
are reversed. (When Futaba
proportional set used)
Gyro OFF setting:
As shown in the figure, when the ATV rate of the gain setting channel switch is
0% or less, the gyro gain becomes zero. When you want to turn off the gyro, set
to this range (40% or less).
AVCS mode gain setting:
When the ATVB rate is 40% or more, the gyro operates in the AVCS mode. The
actual gyro gain changes based on the gyro gain trimmer setting of the gyro itself.
When the gyro gain trimmer is set to 100%, the gyro gain becomes 100% at
100% ATV rate and becomes 50% at 70% ATV rate. When the gyro gain trim-
mer is set to 50%, when the ATV rate is 100%, the gyro gain becomes 50% and
when the ATV rate is 70%, the gyro gain becomes 25%.
Normal mode gain setting:
When the ATVA rate is 40% or more, the gyro operates in the Normal mode. The
gyro gain setting can be adjusted the same as in the AVCS mode.
When gain switching from transmitter function
not used:
The gyro gain switching connector is not connected to the receiver. In this case,
the gyro operates in the Normal mode. The gyro gain is set using the gyro gain
trimmer.
O
PERATION
I
NSTRUCTIONS
5
Mount and adjust the GYA350 as described below.
Gyro Mounting Method
Make a gyro bed so that the bottom of the gyro body is perpendicu-
lar to the direction of the axis to be controlled and securely install
the gyro with the accessory double-sided sponge tape at a position
at which vibrations are minimal.
•If this axis changes, the gyro also corresponds to linkage of
other axis.
•Aileron control
Aileron axis
Elevator axis
•Elevator control
•Rudder control Rudder axis
Usage Precautions
•When taking off and landing, always switch to the Normal mode.
Taking off and landing in the AVCS mode is dangerous.
•We recommend that you use the rudder control gyro in the
Normal mode. In the AVCS mode, rudder operation is neces-
sary when turning to prevent weathervaneing. Use the gyro in
the Normal mode unless you are an expert in rudder operation.
•When the gyro is ON, the servo operating angle increases.
Increase the travel width of the flight control surfaces so that
they will not strike the linkage even when the servo is operated
to its maximum deflection angle.
•Always use the miniature screwdriver supplied to oper-
ate the GYA350 selector switches and trimmers. Do
not apply excessive force.
Beginner setting
(When there is no vacant receiver channel)
Use this setting method when there is no vacant receiver channel.
Use the GYA350 in the Normal mode only.
Mounting to fuselage and initial setting
1. Gyro mounting
Mount the gyro to the axis you want to control in accordance with "Gyro
Mounting Method".
2. Gyro connection
• Do not connect the gain switching con-
nector.
• Connect to the receiver output of the
channel to be controlled.
• Connect to the servo. 50% 100%
Control selector
switch (CNT)
3. Trimmer setting (Initial)
Set the gyro gain trimmer to about the 50% position.
Set the control gain trimmer to about the 100% position.
4. Controlled axis selection
When using the GYA350 to control the ailerons, set the
control selector switch to the AIL position. When using the
GYA350 to control the elevators or rudder, set the control
selector switch to the ELV position.
5. Power ON procedure
Turn on the transmitter power, then turn on the receiver and gyro power.
After the gyro power is turned on, initialization is automatically performed
for about three seconds. Never move the aircraft during this period.
During initialization, the gyro monitor LED flashes.
6. Gyro direction of operation check
Tilt the aircraft about the controlled axis, and check if the gyro
applies rudder in the direction opposite the direction of tilt.
If the rudder moves in the opposite direction switch the gyro
direction of operation selector switch.
Gyro direction
of operation
selector switch Flight adjustments
1. Power ON procedure
Turn on the transmitter power, then turn on the receiver and gyro power.
After the gyro power is turned on, initialization is automatically performed
for about three seconds. Never move the aircraft during this period.
2. Trimming
Fly and trim the aircraft.
If there is a large mechanical deviation, correct the linkage. Connect the
linkage so that the servo horns are as close to the center position as
possible and the transmitter trimmers are also at the center position.
3. Gyro gain adjustment
When the servo hunts, the gyro gain is too high. Lower the
gain with the gyro gain trimmer until the hunting stops. The
gyro will display best performance at a gain just before
hunting occurs. Perform trimming by flying the aircraft
repeatedly.
4. Rudder effect adjustment
Use the transmitter steering angle adjustment function to
adjust the rudder effect.
However, when the rudder effect is substantially different
from that when the gyro was not mounted, adjust it with the
control gain trimmer.
When the gyro is turned on, the rudder will feel sluggish. Adjust the
control gain so that the rudder effect matches the rudder effect when the
rudder stick is set to its maximum position. When the control gain is
increased, the rudder effect increases.
Gyro gain trimmer
(G GAIN)
Control gain trimmer
(C GAIN)