USS Mackerel (SS-204)

Mackerel on 22 March 1941.
History
United States
Name	Mackerel
Builder	Electric Boat Company, Groton, Connecticut[1]
Laid down	6 October 1939[1]
Launched	28 September 1940[1]
Commissioned	31 March 1941[1]
Decommissioned	9 November 1945[1]
Stricken	28 November 1945[1]
Fate	Sold for scrap, 24 April 1947[1]
General characteristics
Class and type	Mackerel-class submarine[3]
Displacement	825 tons (838 t) surfaced[2] 1,190 tons (1,209 t) submerged[2]
Length	243 ft 1 in (74.09 m)[2]
Beam	22 ft 1 in (6.73 m)[2]
Draft	13 ft ¼ in (4.0 m)[2]
Propulsion	2 × Electric Boat direct drive diesel engines[3] 2 × 60-cell Sargo batteries[2] 2 × Electro Dynamic electric motors[3] 2 shafts[3] 1,680 bhp (1,250 kW) surfaced[3] 1,500 bhp (1,100 kW) submerged[3]
Speed	16 knots (30 km/h) surfaced[3] 11 knots (20 km/h) submerged[3]
Range	6,500 nautical miles (12,000 km) at 10 knots (19 km/h) (service)[2]
Test depth	250 ft (76 m)[2]
Complement	4 officers, 33 enlisted[2]
Armament	6 × 21 in (533 mm) torpedo tubes  (four forward, two aft)  12 torpedoes[2] 1 × 3 inch (76 mm)/50 caliber deck gun[2]

USS Mackerel (SS-204), the lead ship of her class of submarines, was the first ship of the United States Navy named for the mackerel. Mackerel and her near-sister Marlin (designed and built by Portsmouth Navy Yard) were prototype small submarines which the Navy was exploring to replace the aging S-class submarines.^[4]