Tambor-class submarine

Tambor-class submarine
Name	Tambor-class submarine
Caption	USS Tambor (SS-198) underway, 1940
Country	United States
Type	Submarine
Builder	Electric Boat Company, Portsmouth Navy Yard
Laid down	1939
Launched	1940
Commissioned	1940–1941
Fate	Several lost in World War II; others scrapped or used as training

Tambor-class submarine The Tambor-class submarine was a group of fleet submarines built for the United States Navy on the eve of World War II. As the first mass-produced American fleet submarine design that combined range, speed, and armament, the class played a pivotal role in Pacific submarine warfare against the Empire of Japan. Tambor-class boats formed the backbone of early war undersea warfare operations until replaced by later designs like the Gato-class submarine and Balao-class submarine.

Design and development

Design work for the Tambor class followed trials and lessons from the Sargo-class submarine and Salmon-class submarine programs, influenced by interwar treaties such as the Washington Naval Treaty and by doctrinal debates within the Bureau of Construction and Repair and the Bureau of Ships. Engineers at the Electric Boat Company and the Portsmouth Navy Yard incorporated advances in propulsion from General Motors and electrical systems from Westinghouse Electric Corporation, while hull form studies referenced operational reports from cruises of USS Narwhal (SS-167) and USS Dolphin (PG-24). Naval architects balanced the need for surfaced speed for fleet operations emphasized by Admiral Thomas C. Hart with extended range demanded by Commander-in-Chief, United States Fleet planners.

Specifications and performance

Tambor-class boats displaced approximately 1,475 tons surfaced and 2,370 tons submerged, with an overall length around 307 feet and beam near 27 feet, echoing dimensions tested at the David Taylor Model Basin. Propulsion comprised diesel engines driving electric generators coupled to twin propeller shafts, with powerplants supplied by General Motors and Fairbanks-Morse, providing speeds up to about 20 knots surfaced and 8–9 knots submerged. Armament included ten 21-inch torpedo tubes—six bow and four stern—matching Mark 14 torpedo loadouts, and a deck gun such as the 3"/50 caliber or later 5"/25; anti-aircraft armament evolved with 20 mm Oerlikon and 40 mm Bofors mounts. Habitability improvements and battery capacity reflected feedback from patrols in the Aleutian Islands and the Solomon Islands.

Construction and commissioning

The lead boat, USS Tambor (SS-198), was laid down at Electric Boat Company yards with sister ships built at Quincy, Massachusetts and the Portsmouth Naval Shipyard. Commissions occurred in 1940–1941 amid escalating tensions following incidents such as the Second Sino-Japanese War and the Tripartite Pact, prompting accelerated production overseen by the Office of Production Management and later the War Production Board. Crews drawn from Naval Academy graduates and enlisted men received training at Submarine School, New London and aboard training hulks at Pearl Harbor and Bremerton before deployment across the Pacific Ocean.

Wartime service and operations

Tambor-class submarines conducted war patrols in key theaters including the Central Pacific, South Pacific, Aleutian Islands Campaign, and around the Philippine Islands. Early patrols targeted convoys supplying the Imperial Japanese Navy and disrupted shipping lanes near Truk and Rabaul. Boats like USS Tambor (SS-198), USS Trout (SS-202), and USS Tautog (SS-199) executed reconnaissance and lifeguard duties during carrier strikes by Task Force 16 and Task Force 58, supporting operations linked to the Battle of Midway and the Guadalcanal Campaign. Intelligence from Station HYPO and OP-20-G improved targeting, while coordination with Submarine Squadron 6 and Submarine Force, U.S. Pacific Fleet optimized patrol areas.

Modifications and upgrades

Operational experience prompted modifications including installation of improved sonar and radar from Radar Division (Naval Research Laboratory), replacement of problematic Mark 14 torpedo components after testing at Pearl Harbor Torpedo Station, and streamlining of conning towers for reduced silhouette. Many Tambor-class boats received enhanced air-search radars such as the SG radar and SD radar, additional 20 mm and 40 mm anti-aircraft guns tied to advice from Commander, Submarine Force staff, and snorkel-like devices for extended submerged diesel operation influenced by reports from European submarine innovations. Habitability upgrades included refrigeration and galley improvements advocated by Submarine Division commanders.

Losses and notable engagements

Several Tambor-class submarines were lost in action during World War II to enemy anti-submarine warfare including depth charges from Imperial Japanese Navy escorts, aircraft from Kido Butai, and defensive minefields around strategic ports. Notable engagements include patrols credited with sinking major freighters and warships during missions associated with the Solomon Islands campaign and the Philippine Sea actions, where boats provided reconnaissance crucial to carrier task force maneuvers. Commanding officers such as Lieutenant Commander Richard H. O'Kane and Lieutenant Commander Dudley W. "Mush" Morton—whose careers spanned other classes—exemplified aggressive tactics later refined in post-war analyses by the Office of Naval Intelligence.

Legacy and preservation

Postwar, surviving Tambor-class boats influenced naval architecture for subsequent classes like the Gato-class submarine and informed Cold War conversion programs including experimental sonar trials at Naval Underwater Sound Laboratory. Several hulls were decommissioned and scrapped during peacetime drawdowns overseen by the Chief of Naval Operations, while museum efforts by organizations such as the Submarine Veterans of World War II and memorials at sites like Pearl Harbor National Memorial commemorate their service. The Tambor class remains a subject in naval history curricula at institutions including the Naval War College and features in exhibits alongside artifacts from the Battle of the Coral Sea and the Battle of Midway.

Category:United States Navy submarines Category:World War II submarines of the United States