Submarine chaser
Submarine chaser
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Submarine chaser

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Submarine chaser

A submarine chaser or subchaser is a type of small naval vessel that is specifically intended for anti-submarine warfare. They encompass designs that are now largely obsolete, but which played an important role in the wars of the first half of the 20th century. Many of the American submarine chasers used in World War I found their way to Allied nations by way of Lend-Lease in World War II.

U.S. Navy submarine chasers were designed specifically to destroy German submarines in World War I, and Japanese and German submarines in World War II. The small 110-foot (34 m) SC-1-class submarine chasers of the design used in World War I carried the hull designator SC (for Submarine Chaser). Their main weapon was the depth charge. They also carried machine guns and anti-aircraft guns. The similar-sized SC-497-class was built for World War II. Also in World War II, larger 173-foot (53 m) PC-461-class submarine chasers used the PC hull classification symbol (for Patrol, Coastal).

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In early 1915, the British Admiralty selected the US Electric Launch Company (Elco) for the production of 50 motor launches for anti-submarine work, British industry being at maximum capacity. This order was eventually increased by a further 530. The whole order was completed by November 1916, and the vessels entered Royal Navy service. The vessels were 80 feet (24 m) in length and capable of 20 knots (37 km/h). They were armed with a 3-pounder gun, towed paravanes to attack submarines and, later, depth charges. Additional motor launches of the Fairmile A, Fairmile B and other classes were built for World War II.

The British sub chasers were operated around the coast in defence. However, they were uncomfortable, wet and not suited to British sea conditions.[citation needed] Although used during the First World War, they were sold when the war ended.

Submarine chasers were used mostly by the United States Coast Guard in World War II for destroying German U-boats that were stationed off the coast of the United States that were trying to sink merchant convoys as they departed American ports. In the Pacific Theatre, submarine chasers were used for amphibious landings, courier and escort duty.

Eight British Fairmile B motor launches were transferred from Canada to the US in World War II, and included the SC-1466 class of sub-chasers.

The Imperial Japanese Navy had around 250 submarine chasers in World War II, principally about 200 of the No.1-class auxiliary submarine chasers. Some of these survived to serve in the Japan Maritime Self Defense Force (JMSDF) after the war.

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