Futaba GY601 - Manual (Page 11)

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several times over by the gyro amp and is balanced with the gyro control
signal so that the transmitter can be used at the normal steering angle.
The AVCS system uses a different rudder control method. As described in
the preceding section, it has additional functions that "attempt to return
movement by external force to the original position" and that generate an
angular velocity proportional to the rudder control signal. That is, it func-
tionally controls the speed of rotation of the tail. The original AVCS
(Angular Vector Control System) came from this.
•In the AVCS mode, when the transmitter rudder stick is moved when
the helicopter was stopped, the rudder servo controls operation until
the tail reaches the specified rotational speed.
•Trim deviation of the rudder control signal also becomes a signal that
causes the tail to turn so that even a little trim deviation causes the
tail to move. Therefore, the rudder trim is made the same in all flight
states and must match the neutral reference signal at the gyro. The
method of reading the rudder neutral signal at the gyro will be
described separately.
•Since the rudder mixing signals from the transmitter also become a
tail rotation signal, all the rudder mixing functions must be disabled.
•In the AVCS mode, the gyro automatically trims the rudder so that
linkage changes cannot be verified. Initially, the GY601 trims the
rudder by flying in the Normal mode to take the rudder linkage neutral
position. This centers the linkage. At this time, this rudder neutral
reference point is read to the GY601.
Giving the gyro the rudder neutral reference signal and performing
tail operation by referring to this signal in the AVCS mode in this
way is how the AVCS system differs from the conventional system.