Futaba GY601 - Manual (Page 9)

9
B
EFORE
U
SE
Differences Between AVCS Gyro and Conventional Gyro
Compared to a convention gyro, the AVCS gyro has a substantially im-
proved 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
AVCS Gyro
AVCS gyro
This following describes how the AVCS system works when the helicopter
is exposed to a side wind while hovering, the same as the preceding item.
When the helicopter is exposed to a side wind, the tail begins to drift. The