ICE CLASS DE­FINED

Soundings - - Walking The Plank -

Although a yacht, Sindbad was built to meet Det Norske Ver­i­tas ( DNV) ice- class stan­dards— not un­usual for ves­sels made in Nor­way. She wasn’t in­tended to break heavy ice, but to op­er­ate in loose ice or plow through thin ice. DNV stan­dards for ice class call for heav­ier-than-nor­mal steel plat­ing, es­pe­cially in a belt around the wa­ter­line, where ice im­pact is most likely. The stem must be re­designed to re­sist im­pact, and the frames, stringers and other in­ter­nal struc­ture beefed-up, too. The run­ning gear must also be stronger than nor­mal. An ice-class ves­sel is built tougher all-around, and that could be the rea­son Sindbad is sail­ing, 56 years af­ter launch.

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