Futaba GY501 - Manual (Page 24)

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B
EFORE
U
SE
Differences Between AVCS Gyro and Conventional Gyro
Compared to a convention gyro, the AVCS gyro has a substantially
improved tail control capacity. Gyro operation also differs from that
of conventional systems in a number of ways.
The following sequentially describes the conventional gyro and the
AVCS gyro.
Conventional gyro
The conventional gyro detects movement of the helicopter's tail and
controls the rudder servo so that movement of the tail stops.
Now, consider hovering when the helicopter is exposed to a side
wind, the tail drifts. When the tail drifts, the gyro detects the tail
rotation angular velocity and operates the servo in the direction that
stops the tail from moving. Drifting of the tail is stopped by control
from the gyro. When the tail stops drifting, the control amount from
the gyro becomes zero. Since the helicopter is always exposed to
side wind, even in this state, the tail starts to drift again. When the
tail drifts, the gyro tries to stop it again. The "drifting stop" operation
is repeated and the tail continues to drift in the wind direction in this
manner. The higher the gyro sensitivity, the smaller the amount of
this drift. However, if the sensitivity is high, hunting will occur and,
therefore, the sensitivity amp has a limit.
• Drifting stop
Forward
Side wind