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SC-1-class submarine chaser
The SC-1 class was a large class of submarine chasers built during World War I for the United States Navy. They were ordered in very large numbers in order to combat attacks by German U-boats, with 442 boats built from 1917 to 1919.
==Development==
In 1916, the then Assistant Secretary of the Navy, Franklin D. Roosevelt ordered the US Navy to design a small anti-submarine vessel that could be built quickly in small civilian boatyards, as if war came, larger shipyards would be busy building larger warships.〔Treadwell, Theodore R. ("Subchasers of World War I" ). ''Splinter Fleet''. Retrieved 4 March 2011.〕 Consideration was given to adopting an wooden Motor Launch built in large numbers by ELCO for the British Royal Navy, but the General Board of the United States Navy thought that these boats were too small to be effective seaboats. The task of designing the new type was given to an experienced designer of small boats, Albert Loring Swasey. He drew up a design for a wooden boat, emphasizing seaworthiness over speed. At first it was intended to use two engines, but a shortage of these engines resulted in the design being changed to use three gasoline engines.〔Gardiner and Gray 1985, pp. 132–133.〕〔
Armament was initially planned to be two 3 inch guns, but the aft gun was usually replaced by a depth charge thrower to attack submerged submarines,〔 with two Colt machine guns completing the armament. Many boats were fitted with hydrophones for detecting underwater noises, with either a K-tube fish-type device of 30 mile range or SC and MB tubes of 5 mile range.〔Moore 1990, p. 152.〕
An initial order of 345 SC boats placed in 1917 was planned to be delivered by the end of 1917, with further orders for the French Navy pushing the total ordered up to 448.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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