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The United States' S-class submarines, often simply called S-boats (sometimes "Sugar" boats, after the then contemporary Navy phonetic alphabet for "S"), were the first class of submarines with a significant number built to United States Navy designs. Others of this class were built to contractor designs. The United States Navy commissioned 51 S-class submarines from 1920 to 1925. The first S-boat, , was commissioned in 1920 and the last numerically, , in 1922. The last of the class actually commissioned was in 1925. The S class is subdivided into four groups of different designs: *Group I (''S-1'' class, or "Holland" type): 25 boats, ''S-1'' and ''S-18'' to ''S-41'', built by Bethlehem Steel at Fore River Shipyard in Quincy, Massachusetts and Union Iron Works in San Francisco, California, as subcontractors for the designer, the Electric Boat Company. *Group II (''S-3'' class, or "Navy Yard" type): 15 boats, ''S-3'' to ''S-17'', built at the Portsmouth Navy Yard and Lake Torpedo Boat at Bridgeport, Connecticut. *Group III (''S-42'' class, or "2nd Holland" type): 6 boats, ''S-42'' to ''S-47'', built at Fore River. *Group IV (''S-48'' class, or "2nd Navy Yard" type): 4 boats, ''S-48'' to ''S-51'', built by Lake. ''S-2'' was a prototype built by Lake, and was not repeated. ''S-1'', ''S-2'', and ''S-3'' were prototypes built to the same specification: ''S-1'' designed by Electric Boat, ''S-2'' by Lake, and ''S-3'' by the Bureau of Construction and Repair (BuC&R) (later Bureau of Ships).〔Lenton, H. T. ''American Submarines'' (Doubleday, 1973), p.17.〕 The ''S-2'' Lake boat was considered inferior. The Electric Boat and BuC&R designs were put into production as Group I and Group II. SS-159 to SS-168 (2nd Holland) and SS-173 to SS-176 (2nd Navy Yard) were cancelled and, contrary to later practice, the hull numbers were used for subsequent submarines.〔Friedman, p. 124〕 Some of the material for these was used by Electric Boat to build the Peruvian Navy's four R-boats. The first S-boat, ''S-1'', was launched on 26 September 1918, by Bethlehem at Fore River, but not commissioned until 5 June 1920.〔Lenton, p.16.〕 ==Design== There were three distinctly different prototypes for the S-boats. The Electric Boat (EB) design formed the basis for the Group I and Group IV boats and were essentially enlarged versions of all their previous designs. A single hull design, all of the ballast tanks were contained within the pressure hull. The hull was a rounded spindle shape and the rudder was placed at the very end of the hull, aft of the twin screws.〔Johnston Part One pp. 2-3〕 Compared to the previous R-boats, Group I S-boats were longer, with more beam, more draft, and 60% greater displacement. This allowed for greater range, larger engines and higher speed, and more torpedo reloads, though the number of forward torpedo tubes was unchanged. The Lake design, ''S-2'', was a modified double hull type, with ballast tanks wrapped around the inner pressure hull. The stern ended in a flat "shovel" shape which gave the stern needed buoyancy. The rudder was mounted beneath the stern and the pivot structure also supported the stern diving planes. To gain surface buoyancy, the superstructure atop the boat was partially watertight. Sea trials showed that the bow tended to burrow into the waves so Lake added a buoyancy tank to the bow, which gave it a humped appearance. This boat suffered from poor maneuverability and was overly complicated. It proved to be unreliable and was not well liked by its crew. The Navy did not choose it for mass production and no further boats were produced to this design.〔Johnston Part One pp. 5 & 12〕 Seven of the Group II and all the Group IV boats had an additional stern tube. Group IV was also longer and had less draft. The Electric Boat designs (Groups I and III) were single-hulled, the others were double-hulled. All S-boats had a 4-inch (102 mm)/50 caliber deck gun, a significant increase over the 3-inch gun of previous US submarines. This was due to observations that the German U-boats frequently used their deck guns, and many U-boats were equipped with 105 mm (4.1-inch) deck guns. Another improvement was the conning tower fairwater. Previous US submarines had small fairwaters to reduce drag and improve submerged speed. Experience gained on North Atlantic patrols during WWI showed that the boats would be spending considerable time on the surface and thus needed better protection for the bridge watchstanders. Examination of captured U-boats after the Armistice also showed that a larger fairwater with permanent grab rails was preferable when surfaced in the North Atlantic, so S-boats were built or backfitted with an improved and much larger fairwater.〔Lenton, p.15 & 17.〕〔Silverstone, Paul H., ''U.S. Warships of World War I'' (Ian Allan, 1970), pp. 144-150〕〔Johnston Part One pp. 3〕 In 1923, experimented with a float plane (an idea the Japanese would later adopt). A cylindrical hangar was installed on the after deck to house a single Martin MS-1 float plane. Tests showed the concept to be unworkable, and the equipment was subsequently removed. The hangar was later reused and rebuilt as the prototype for the McCann Rescue Chamber, a diving bell for rescuing crewmen from sunken submarines.〔Johnston Part One pp. 11 & 13〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「United States S-class submarine」の詳細全文を読む スポンサード リンク
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