PRINCIPLES OF A SET OF MANEUVERING INDEXES BASED ON SWAY YAW PHASE-RELATIONS/

A brief critical review of existing approaches for measuring ship mane uverability is given, followed by an outline of the basic properties o f alternative indices of maneuverability from the shiphandler's point of view. Next, the principles governing the proposed alternative measu res are explained. For given bare hulls or hull-rudder-propeller confi gurations, the main results of this paper are that each alternative ma neuvering index provides information (a) on the rate of change of the sway speed relative to yaw stimulation (index magnitude), and (b) on s traight-line stability (index sign). Moreover, the paper summarizes as an illustration maneuvering criteria based on the alternative indices of maneuverability.