User manual FUTABA GY401

[. . . ] Using the AVCS mode correctly An AVCS gyro is an angular velocity command type gyro. The gyro constantly compares the transmitter rudder operation signals and gyro internal reference signal (transmitter rudder neutral signal) and controls the helicopter tail rotation speed accordingly. Therefore, for the AVCS function to operate normally, the rudder neutral signal must be memorized in the gyro before flight. when the power was turned on (neutral position memorized in the gyro). When flying in the AVCS mode, set the rudder trim to the same position under all flight conditions, including hovering and idle up. [. . . ] If the monitor LED lights, the gyro is operating in the AVCS mode. When the power is turned on in the normal mode, the monitor LED will display an alarm by flashing intermittently. At this time, set the sensitivity switch to the AVCS position and turn on the gyro power again. (3) Switch the transmitter gyro sensitivity switch to the normal position. Lift off the helicopter and hover and adjust the rudder neutral position with the transmitter trim lever. Large rudder neutral position deviation may require readjustment of the fuselage linkage. Sensitivity Switching Connector Gyro sensitivity switching signal input connector. Connect to the receiver sensitivity switching channel (normally CH5). This connector is also simultaneously used to switch between the AVCS and normal operation modes. Since this connector is a single wire signal line, do not pull it forcefully. Fuselage gyro bed Always install the GY401 using the double-sided sponge tape supplied. DS Mode Switch (DS) Digital servo (DS) mode switch. The ON position is the high-speed output mode for digital servo only. When using a normal servo, always set this switch to the OFF position. If it is set to the ON position, the servo will be destroyed. Rudder Input Connector Connects to the receiver rudder channel (CH4) output connector. (2) Gyro connection Connect to receiver sensitivity switching channel (CH5). Connect to receiver rudder channel (CH4). Rudder Servo Connector Connects the rudder servo. (Monitor LED display) Relationship between transmitter sensitivity adjustment and gyro operation sensitivity and operation mode The gyro sensitivity becomes zero when the transmitter sensitivity switching signal is in the neutral position. The sensitivity can be adjusted over the deflection width of the signal by operating in the AVCS mode at the + side and in the normal gyro mode at the - side of the neutral position. When the transmitter has a gyro sensitivity switching function (T9ZHwc Series, T8UHPS, etc. ), and the transmitter GYRO setup screen sensitivity setting is 50%, the GY401 gyro sensitivity becomes zero. When the setting exceeds 50%, the gyro enters the AVCS mode and the sensitivity becomes 100% at 100%. At settings lower than 50%, the gyro enters the normal gyro mode and the sensitivity becomes 100% at 0%. When sensitivity setting is performed by transmitter switch channel, AVCS mode and normal gyro mode switching is performed by switch position. The sensitivity of each mode is set by the rudder angle adjustment function (ATV, AFR, etc. ) of the respective channel. When the ATV or AFR set value is 90%, the gyro sensitivity becomes 100%. Connect to rudder servo. LED display Rapid flash Steady light Off Gyro operation state Displayed while data is being initialized at power ON. Indicates that the gyro is operating in the AVCS mode. Indicates that the power is OFF, or the gyro is operating in the normal gyro mode. [. . . ] This tendency is greater with 60 class helicopters than with 30 class helicopters. Start sensitivity adjustment with a gyro sensitivity of 70 ~ 80% when hovering and 60 ~ 70% during flight as the criteria and search for the best sensitivity for the helicopter used. 50% 45% 10% 0% 10% 45% 50% 0% Normal side Normal side (Backward position) Cannot be set in this range. 0% 50% Normal mode 60% 50% 100% 90% 100% (6) Gyro operation direction check The figure above is an example of use of the gyro sensitivity switching function (GYRO) to switch hovering (AVCS mode), idle up 1 (AVCS mode) and idle up 2 (normal gyro mode) by SW-E and to set the gyro sensitivity to 80%, 60%, and 60%, respectively. Call the transmitter advance menu GYRO setup screen. Press the cursor key and display the switch selection screen. [. . . ]