User manual FUTABA GYA350

[. . . ] 1M23N07403 Thank you for buying a GYA350 AVCS gyro. Before using your new gyro, please read this manual thoroughly and use the gyro properly and safely. After reading this manual, store it in a safe place. · No part of this manual may be reproduced in any form without prior permission. · The contents of this manual are subject to change without prior notice. [. . . ] ·Always use the miniature screwdriver supplied to operate the GYA350 selector switches and trimmers. Do not apply excessive force. 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 Gyro gain trimmer hunting occurs. Perform trimming by flying the aircraft (G GAIN) repeatedly. 4. Rudder effect adjustment Control gain trimmer (C GAIN) 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. Standard Setting (Setting using all GYA350 functions) (Gain setting with T8UAPS example 2) The following describes how to use CH7 to switch the aileron and elevator gain and CH8 to switch the rudder axis gain. The aileron and elevator gyros gain switching connector is connected to receiver CH7 by branch cord. A FLAPRON compatible GYA351 is used to control the aileron axis, and to also control the air brake. When air brake is ON, the aileron and elevator axis gyros must be set to the Normal mode. 1. Call the transmitter PMIX-1 screen, and make the following settings: - Activate PMIX1. switch (CNT) When you want to set the gain of Normal the aileron and elevator gyros Air Brake independently, adjust the gyro gain trimmer on the gyros individually. 4. Call the transmitter PMIX-3 screen, and make the following settings: - Activate PMIX-3. Gain setting Set the gain as described below. The following examples assume that the GYA350 is installed in three axes. (Gain setting with T8UAPS example 1) The following describes how to use channels 5, 7, and 8 to switch the gain of the rudder, aileron, and elevator axis. 1. Call the transmitter 5ch ATV screen and make the following setting: - Set the CH5 switch rate for both directions to 70%. This sets the gyro gain to 50%. ·In the switch forward position, the gyro operates in the AVCS mode and in the switch backward position, the gyro operates in the Normal mode. 5. Call the transmitter PMIX-4 screen, and make the following settings: - Activate PMIX-4. - Select switch direction UP . Normal CH8 knob 6. [. . . ] This ends AVCS side setting. Neutral check method In the AVCS mode, the servo does not return to the neutral position even though the stick is returned to neutral. When you want to check the servo neutral position during linkage neutral check, etc. , set the gain switch to the Normal position, or quickly move the transmitter stick to the left and right at least three times and immediately return the stick to the neutral position. A dead zone is produced in servo operation relative to stick operation. However, this is because the stick control gain rises and is not an abnormality. Mounting Precautions Always use the accessory sensor tape to install the gyro to the fuselage. This is necessary to securely fasten the gyro to the fuselage so that operation of the gyro does not transmit unwanted fuselage vibrations directly to the sensor. and turn on the transmitter power switch, then turn on the gyro power. When using the gyro in the AVCS mode, turn off mixing. For example, if elevator down mixing is used by the air brake, the gyro will judge that an elevator down signal was received and will cause the aircraft to dive. [. . . ]