Bust Cap
How Do USCG Cutters Bust Thru The Ice At The Polar Caps?
How do the US Coast Guard ( or any ship) ships break thru ice at the polar caps?
I saw a show on History Channel where USCG ships were breaking thru the ice. The ice looks thick. I wondered how the ship breaks thru it.
The Coast Guard has three icebreakers. The Healy (which is the newest, 1999) The Polar Sea and Polar Star. For a ship to be considered an icebreaker it requires three components: a strengthened hull, an ice-clearing shape, and the power to push through the ice. Icebreakers are constructed with a double hull and watertight compartments in case of a breach. The ship's hull is thicker than normal, especially at the bow, stern, and waterline, using special steel that has optimum performance at low temperatures. The thicker steel at the waterline typically extends about 1 m above and below the waterline, and is reinforced with extra internal ribbing, sometimes twice the ribbing of a normal ship. The bow is rounded rather than pointed, allowing the vessel to ride up over the ice, breaking it with the weight of the vessel. The hull has no appendages likely to be damaged by the ice, and the rudder and propeller are protected by the shape of the hull. The propeller blades are strengthened, and the vessel has the ability to inspect and replace blades while at sea. Most icebreakers are painted red so they can be scene against a white background of ice and snow.
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