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| S-class submarine (United States Navy) | |
|---|---|
| Name | S-class submarine |
| Caption | USS S-1 (SS-105) underway, 1920s |
| Country | United States |
| Operator | United States Navy |
| Class before | L-class submarine (United States Navy) |
| Class after | T-class submarine (United States Navy) |
| First commissioned | 1918 |
| Last decommissioned | 1946 |
S-class submarine (United States Navy) The S-class submarines were a series of coastal and fleet submarines built for the United States Navy during the late World War I era and operated through the Interwar period into World War II. Designed to improve on earlier L-class submarine (United States Navy) designs, the class saw diverse service in Atlantic Ocean and Pacific Ocean theaters, contributing to training, patrol, and convoy escort duties. Several boats underwent experimental modifications and later influenced postwar Gato-class submarine and Balao-class submarine developments.
S-class conception followed operational lessons from the Submarine Force, United States Navy campaigns in World War I and the performance of the Holland Torpedo Boat Company types and Electric Boat Company designs. Naval architects at Bureau of Construction and Repair and Bureau of Engineering (Navy) pursued greater range, improved habitability, and standardized torpedo armament compatible with Mark 10 torpedo and later Mark 14 torpedo trials. Competing designs were submitted by Electric Boat Company, Newport News Shipbuilding, and Bethlehem Shipbuilding Corporation yards, prompting subclass differentiation. Influences included wartime convoy escort needs exemplified by the First Battle of the Atlantic and technological developments such as diesel-electric propulsion pioneered by HMS E-class contemporaries and early Admiralty studies.
Construction took place at multiple shipyards: Fore River Shipyard, Union Iron Works, Bethlehem Shipbuilding Corporation, and Electric Boat. Keel-laying began in 1917–1918 with rapid wartime procurement overseen by the United States Department of the Navy and directed by figures like Franklin D. Roosevelt (Assistant Secretary of the Navy) during procurement policy debates. Commissioning ceremonies often involved naval dignitaries from Washington, D.C. and regional commanders from Commander, Submarine Force, U.S. Pacific Fleet or Commander, Submarine Force, U.S. Atlantic Fleet. Ships entered service with hull numbers SS-83 through SS-176 series and were assigned to squadron elements such as Submarine Division 1 and Submarine Squadron 2.
S-class boats served widely: patrols off the Northeast United States coast, training cruises to Guantanamo Bay Naval Base, and long transfers to Philippine Islands and Cavite Naval Yard. During the interwar years they took part in fleet problems including Fleet Problem I and Fleet Problem IX, operating alongside USS Langley (CV-1) and USS Saratoga (CV-3) in combined exercises. In World War II, older S-boats conducted patrols in the Caribbean Sea, Aleutian Islands, and South Pacific, conducting reconnaissance and lifeguard missions for Army Air Forces and United States Marine Corps aviators, and occasionally engaging enemy shipping during early-war shortages of modern boats. Notable skippers were officers later prominent in the United States Naval Academy graduate lists and in commands of Submarine Force, U.S. Pacific Fleet.
S-class submarines featured diesel-electric propulsion with twin diesel engines linked to General Electric generators and electric motor drive trains, enabling surfaced speeds around 14–15 knots and submerged speeds near 11 knots. Armament typically included four 21-inch torpedo tubes forward, two external bow tubes on some subclasses, and a 4-inch/50 caliber deck gun for surface actions, consistent with contemporary Naval Ordnance doctrine. Displacement ranged roughly 800–900 long tons surfaced and over 1,000 long tons submerged; crew complements varied between 38 and 44 officers and enlisted, reflecting evolving habitability standards first set at Naval Training Station Newport and later revised after Naval Architecture evaluations. Sensor suites included early periscopes by Bausch & Lomb and primitive hydrophones informed by studies at the Naval Experimental Station.
The S-class encompassed multiple groups commonly designated by builder: the S-1 (Group I) Electric Boat boats, the S-3 (Group II) designs by Lake Torpedo Boat Company, and the S-49 (Group III) improved boats built by Bethlehem Shipbuilding. Differences included bow arrangements, bridge fairwater modifications, and internal tank layout; these distinctions paralleled debates at Bureau of Ships over standardization. Experimental conversions tested air-conditioning for Pacific Fleet deployments and the installation of improved Mark 6 fire control components on select hulls.
Commissioned late in World War I, a few S-boats conducted North Atlantic patrols and convoy screening in waters influenced by U-boat campaign (World War I), though most saw primary use in training and fleet problem maneuvers during the 1920s and 1930s. Deployments included extended cruises to Hawaii, Philippine Islands, Panama Canal Zone, and participation in goodwill visits to Japan and Australia as part of peacetime naval diplomacy overseen by the United States Asiatic Fleet. Crews undertook anti-submarine warfare drills informed by Admiral William S. Sims-era reforms and tested emerging doctrines later codified by institutions such as Naval War College.
The S-class influenced subsequent American submarine design through operational lessons that informed Gato-class submarine and Balao-class submarine endurance, habitability, and torpedo arrangements. Several S-boats were used as training hulks, target ships, or transferred in Lend-Lease-style exchanges of techniques with allied services, and a few survived into reserve fleets at Philadelphia Naval Shipyard and Mare Island Naval Shipyard before final scrapping post-World War II. Preserved artifacts and interpretive displays concerning S-class service appear in collections at institutions like the Submarine Force Library and Museum and regional naval museums, contributing to scholarship at the Naval History and Heritage Command.