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The Tench Class submarines
Tench-class submarines were a type of submarine built for the United States Navy (USN) between 1944 and 1951. They were an evolutionary improvement over the Gato and Balao classes, only about 35 to 40 tons larger, but more strongly built and with a slightly improved internal layout. Further improvements were made beginning with SS-435, which are sometimes referred to as Corsair class.
Initial plans called for 146 to be built, but 115 were cancelled in 1944 and 1945 when it became apparent that they would not be needed to defeat Japan. The remaining 31 were commissioned between October 1944 (Tench) and February 1951 (Grenadier).
One Tench (ex- Cutlass was transferred from the USN to the Republic of China Navy as Hai Shih Two went to Italy as the Gianfranco Gazzana-Priaroggia class. USS Argonaut (SS-475) was sold to the Royal Canadian Navy in 1968, renamed HMCS Rainbow, and decommissioned in 1974.
By December 1946 the Navy had completed plans for the modern telescopic snorkel (a device to enable diesel-powered submarines to run submerged for long periods of time), and USS Irex
(SS $82) was ordered to Portsmouth for installation and test of this equipment.
She spent July 1947 to February 1948 evaluating her new apparatus and
joined Submarine Squadron 8 at New London as the U.S. Navy's first operational snorkel submarine.
Some of the class were updated through the GUPPY (The Greater Underwater Propulsion Power Program). The difference is noticeable by the level foredeck and the rounded bow
Portsmouth Naval Shipyard, Length:
Electric Boat Company
1,570 tons surfaced,
2,416–2,429 tons submerged
311 feet 6 inches-9inches (95 m)Beam:
27 feet 3 inches-27 feet 4 inches (8.3 m)Draft:
17 feet ten inches (5.2 m)Propulsion:
4 × diesel engines driving electric generators;Speed:
2 × 126-cell Sargo batteries
2 × low-speed electric motors
Two propellers; 5,400 shp (4,000 kW) surfaced
2,740 shp (2,040 kW) submerged
20.25 knots surfaced (38 km)Test Depth:
8.75 knots submerged (16 km)
400 Feet (120 m)Complement:
10 Officers 70-71 menArmament:
10× 21 in (530 m) torpedo tubes
(Six forward, two aft)
1 x 5 inch (127 mm) 25 caliber deck gun
Bofors 40 mm, and Oerlikon 20 mm cannon