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Finally, vessels intended for icebreaking as their main purpose could be assigned an additional class notation "Icebreaker" after the ice class, e.g. POLAR-10 Icebreaker. [6] Following the merger of Det Norske Veritas and Germanischer Lloyd in 2013, the old Det Norske Veritas ice class rules were superseded by new DNV GL ice classes. [7]
The ship has a length of 118 metres (387 feet) and is a double-hulled icebreaker. She is operational at temperatures as low as −50 °C (−58 °F). Polarstern can break through ice 1.5 m (4 ft 11 in) thick at a speed of 5 knots (9.3 km/h; 5.8 mph). Thicker ice of up to 3 m (9.8 ft) can be broken by ramming.
Polar-class icebreakers USCGC Polar Star (WAGB-10), USCGC Polar Sea (WAGB-11) are heavy icebreakers operated by the United States Coast Guard (USCG). These cutters, specifically designed for icebreaking, have reinforced hulls, special icebreaking bows, and a system that allows rapid shifting of ballast to increase the effectiveness of their icebreaking.
The 2012-built South African polar research vessel S. A. Agulhas II is one of the few vessels rated PC 5 or higher.. Polar Class (PC) refers to the ice class assigned to a ship by a classification society based on the Unified Requirements for Polar Class Ships developed by the International Association of Classification Societies (IACS).
The curved bow allows Polar Star to ride up on the ice, using the ship's weight to break the ice. [4] The 13,000-ton (13,200-metric ton) Polar Star is able to break through ice up to 21 feet (6.4 m) thick by backing and ramming, and can steam continuously through 6 feet (1.8 m) of ice at 3 knots (5.6 km/h). [4]
USCGC Eastwind (WAGB-279) was a Wind-class icebreaker that was built for the United States Coast Guard. Completed in time to see action in World War II, she continued in USCG service under the same name until decommissioned in 1968.
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