USS Seahorse (SS-304)

USS Seahorse underway post-1943 in the Pacific Ocean
History
United States
Name	Seahorse
Builder	Mare Island Naval Shipyard[1]
Laid down	1 July 1942[1]
Launched	9 January 1943[1]
Commissioned	31 March 1943[1]
Decommissioned	2 March 1946[1]
Stricken	1 March 1967[1]
Fate	Sold for scrap, 4 December 1968[1]
General characteristics
Class and type	Balao-class diesel-electric submarine[3]
Displacement	1,526 long tons (1,550 t) surfaced[3] 2,424 long tons (2,463 t) submerged[3]
Length	311 ft 10 in (95.05 m)[3]
Beam	27 ft 4 in (8.33 m)[3]
Draft	16 ft 10 in (5.13 m) maximum[3]
Propulsion	4 × Fairbanks-Morse Model 38D8-1⁄8 9-cylinder opposed-piston diesel engines driving electrical generators[4][5] 2 × 126-cell Sargo batteries[6] 4 × high-speed Elliott electric motors with reduction gears[4] 2 × propellers[4] 5,400 shp (4.0 MW) surfaced[4] 2,740 shp (2.04 MW) submerged[4]
Speed	20.25 knots (38 km/h) surfaced[2] 8.75 knots (16 km/h) submerged[2]
Range	11,000 nautical miles (20,000 km) surfaced at 10 knots (19 km/h)[2]
Endurance	48 hours at 2 knots (3.7 km/h) submerged[2] 75 days on patrol
Test depth	400 ft (120 m)[2]
Complement	10 officers, 70–71 enlisted[2]
Armament	10 × 21-inch (533 mm) torpedo tubes 6 forward, 4 aft 24 torpedoes[6] 1 × 5-inch (127 mm) / 25 caliber deck gun[6] Bofors 40 mm and Oerlikon 20 mm cannon

USS Seahorse (SS-304), a Balao-class submarine, was the first submarine and second ship of the United States Navy to be named for the seahorse, a small fish whose head and the fore part of its body suggest the head and neck of a horse.

Seahorse was laid down on 1 August 1942 by the Mare Island Navy Yard, Vallejo, California. The vessel was launched on 9 January 1943, sponsored by Mrs. Chester C. Smith, and commissioned on 31 March 1943.