The ISO 12217 Standards for Small Craft Stability and Buoyancy Assessment and Categorization: Application Case for Non-Sailing Boat

The ISO 12217 Standards for Small Craft Stability and Buoyancy enables the determination of the limiting environmental condition for which an individual boat has been designed. They are prescriptive rules based on a deterministic approach taking into consideration the design parameters assumed significant for the assessment of stability i.e. righting arm curve, effect of inclining arms, position of downflooding openings. In the proposed paper an application case is examined for a 24 m motor yacht built in FRP and suitable for ocean sailing condition. The different parameter evaluations are compared and discussed, also in relation to different loading conditions. Because of the "borderline" dimension of the boat, the stability criteria of the MCA code of Practice for Safety of Large Commercial Sailing & Motor Vessels are also applied and a comparison between the two kinds of requirement is performed.