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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 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).
The Polar Icebreaker Project (previously Polar Class Icebreaker Project) is an ongoing Canadian shipbuilding program under the National Shipbuilding Strategy. [6] Announced in 2008 with an intention to replace the ageing CCGS Louis S. St-Laurent with a new polar icebreaker by 2017, the program has faced multiple delays and changes, and as of 2024 consists of two planned icebreakers, CCGS ...
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the merger of Det Norske Veritas and Germanischer Lloyd in 2013, the old Det Norske Veritas ice class rules were superseded by new DNV GL ice classes.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.
Glacier in 1956.. Glacier was essentially an improved Wind-class icebreaker, larger and more powerful.Like them, her entire hull was designed for great strength. With a relatively short length in proportion to the great power developed, her bow had the characteristic sloping forefoot that enabled her to ride up on heavy ice and break it with the weight of the vessel.
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The Polar Security Cutter Program is a program to recapitalize the United States Coast Guard's aging fleet of icebreakers, currently consisting of the heavy icebreaker USCGC Polar Star and the medium icebreaker USCGC Healy, with three new multi-mission vessels referred to as Polar Security Cutters (PSC).