Avcs gyro – Futaba GY611 User Manual

Page 9

EFORE

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.

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 veloc-

ity 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 helicop-

ter 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