Futaba GYA351 - 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 GYA351 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
Usage Precautions
•When taking off and landing, always switch to the Normal mode.
Taking off and landing in the AVCS mode is dangerous.
•When using an air brake, use the gyro in the Normal mode. If
used in the AVCS mode, the aircraft will roll.
•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 GYA351 in the Normal mode only.
Mounting to fuselage and initial setting
1. Gyro mounting
Mount the gyro to the axis in accordance with "Gyro Mounting Method".
2. Gyro connection
• Do not connect the gain switching connector.
• Connect to the receiver output of ch1.
• Ch1 servo.
50% 100%
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. 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.
5. Gyro direction of operation check
Tilt the aircraft about the aileron 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 (ch1)(DIR.A)
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
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)
Standard Setting
(Setting using all GYA351 functions)
This standard setting controls gain switching and AVCS/ Normal
gyro operation mode switching from the transmitter.
However, when using the GYA351 with its GYA350 sister product,
and mounting gyros in three axis, three vacant channels are neces-
sary for gain and operation mode switching. When there are not
enough vacant channels, do not connect the gain switching connec-
tor and operate the gyro in the Normal mode only. The gain of the
gyros of two axes can also be switched simultaneously by using a
branch cord.
Mounting to fuselage and initial setting
1. Gyro mounting
Install the gyros to the axes in accordance with "Gyro Mounting Method".
• Connect to the receiver output of ch6.
• Ch6 servo.
Aileron axis
Gyro direction of operation
selector switch (ch6)(DIR.F)