What is meaning of Turning ability of ships?

Turning ability is the measure of the ability to turn the vessel using hard-over rudder (or other primary mean of directional control), the result being a minimum “advance at 90° change of heading” and  “tactical diameter” defined by the “transfer at 180° change of heading”.

A turning circle maneuver is to be performed to both starboard and port. The rudder angle must be the maximum design rudder angle permissible at the test speed, but is not required to be more than  35 degree.


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