ICE CLASS DEFINED
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.