Simrad AP28 Technical Information download pdf (Page 40)

38 | Operation

Gybing

Gybing is possible when the true wind angle is larger

than 120°.

TURN

The time to make a gybe is determined by the speed of

the boat to make it as quick as possible within control.

Tack and gybe prevent

When beati

ng and running, using the autopilot is most

critical.

If the sails are unbalanced when beating, yaw forces from

the sails can drive the boat into the wind. If the boat is

driven beyond the set minimum wind angle (see page

90), the thrust from the sails will suddenly disappear and

reduces the

boat speed. Hence the boat will be more

difficult to steer because the rudder will become less

effective.

The tack prevent function in WIND mode has been

implemented to avoid such situations. It will react

immediately when the apparent wind angle becomes 5°

less than the set minimum wind angle, and more rudder

will be commanded.

When running, it is difficult to steer the boat with waves

coming sideways or from behind. The waves may yaw the

boat into an unwanted gybe; this can be hazardous for

both the crew and the mast.

The gybe prevent function will be activated when the

actual apparent wind angle becomes greater than 175° or

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Simrad AP28 Technical Information Page 40