USS F-2 (SS-21)

	USS F-2, ex-Barracuda, underway in San Diego Harbor, California, c. 1912–1914
History
United States
Name	Barracuda
Namesake	The barracuda
Builder	Electric Boat (design); Union Iron Works, San Francisco, California;
Cost	$470,519.44 (hull and machinery)
Laid down	23 August 1909
Launched	19 March 1912
Sponsored by	Miss Annette Reid Rolph
Commissioned	25 June 1912
Decommissioned	16 March 1916
Recommissioned	13 June 1917
Decommissioned	17 March 1922
Renamed	F-2 (Submarine No.21), 17 November 1911
Identification	Hull symbol: SS-21 (17 July 1920); Call sign: NCJ; ;
Fate	Sold, 17 August 1922
General characteristics
Class & type	F-class submarine
Displacement	330 long tons (335 t) surfaced; 400 long tons (406 t) submerged;
Length	142 ft 6 in (43.43 m)
Beam	15 ft 5 in (4.70 m)
Draft	12 ft 2 in (3.71 m)
Installed power	780 hp (582 kW) diesel; 620 hp (462 kW) electric;
Propulsion	2 × NELSECO diesel engines; 2 × Electro Dynamic electric motors; 2 × 60-cell batteries; 2 × Propellers;
Speed	13.5 kn (25.0 km/h; 15.5 mph) surfaced; 11.5 kn (21.3 km/h; 13.2 mph) submerged;
Range	2,300 nmi (4,300 km; 2,600 mi) at 11 kn (20 km/h; 13 mph) surfaced; 100 nmi (190 km; 120 mi) at 5 knots (9.3 km/h; 5.8 mph) submerged;
Test depth	200 ft (61 m)
Capacity	11,500 US gal (44,000 L; 9,600 imp gal) fuel
Complement	1 officers; 21 enlisted;
Armament	4 × 18 inch (450 mm) bow torpedo tubes (4 torpedoes)

USS Barracuda/F-2 (SS-21), also known as "Submarine No. 21", was an F-class submarine in the United States Navy (USN). She was the first ship of the USN named for the barracuda, though she was renamed F-2 prior to launching.