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. [. . . ] When the tail drifts, the gyro generates a control signal that stops the drift. When the tail stops drifting, the control signal from the gyro becomes zero. If the cross- Operation of AVCS Gyro Conversely, with an AVCS gyro, when the helicopter encounters a cross-wind and the tail drifts, a control signal from the gyro stops the drift. At the same time, the gyro computes the drift angle and constantly outputs a control Symbol: FUTABA CORPORATION ; Prohibited ; Mandatory Makuhari Techno Garden Bldg. , B6F 1-3 Nakase, Mihama-ku, Chiba 261-8555, Japan Phone: (043) 296-5118 Facsimile: (043) 296-5124 ©FUTABA CORPORATION 2000, 7 4 GY401 FUNCTIONS Monitor LED Indicates the operating status of the GY401. The display contents are shown below. Control Delay Trimmer (DELAY) Rudder control signal operation speed trimmer. Conversely, to stop hunting, characteristics can be improved by adjusting the delay. First, turn on the transmitter power, then turn on the gyro power (shared with receiver). Since the GY401 initializes the data when the power is turned on, set the rudder stick to the neutral position and do not move the helicopter for approximately 3 seconds. 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. 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. 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%. [. . . ] If the LED flashes twice, the rudder trim of that flight condition has shifted. (7) Hover and fly in the AVCS mode and set the gyro sensitivity to the point just before hunting begins. (For other information, see "One point advise". ) (8) Adjust the rudder steering effect using the transmitter rudder angle adjustment functions (AFR, D/R, etc. ). (9) When hunting occurs at pirouette stop, increase the delay with the delay trimmer. [. . . ]