USS F-2 (SS-21)

USS F-2 underway in San Diego harbor, California
History
United States
Name:	USS F-2
Builder:	Union Iron Works, San Francisco, California
Laid down:	23 August 1909, as USS Barracuda
Launched:	19 March 1912
Commissioned:	25 June 1912
Decommissioned:	16 March 1922
Renamed:	USS F-2, 17 November 1911
Fate:	Sold, 17 August 1922
General characteristics
Type:	F-class submarine
Displacement:	330 long tons (335 t) surfaced 400 long tons (406 t) submerged
Length:	142 ft 7 in (43.5 m)
Beam:	15 ft 5 in (4.7 m)
Draft:	12 ft 2 in (3.7 m)
Installed power:	780 bhp (580 kW) (diesel) 610 hp (450 kW) (electric)
Propulsion:	2 × diesel engines 2 × electric motors
Speed:	14 knots (26 km/h; 16 mph) surfaced 11.25 knots (20.84 km/h; 12.95 mph) submerged
Range:	2,500 nmi (4,600 km; 2,900 mi) at 11 knots (20 km/h; 13 mph) on the surface 100 nmi (190 km; 120 mi) at 5 knots (9.3 km/h; 5.8 mph) submerged
Test depth:	200 feet (61.0 m)
Complement:	22 officers and enlisted men
Armament:	4 × bow 18 inch (450 mm) torpedo tubes

USS F-2 (SS-21) was an F-class submarine built for the United States Navy during the 1910s.

The F-class boats had a length of 142 feet 7 inches (43.5 m) overall, a beam of 15 feet 5 inches (4.7 m) and a mean draft of 12 feet 2 inches (3.7 m). They displaced 330 long tons (340 t) on the surface and 400 long tons (410 t) submerged. The F-class submarines had a crew of 1 officer and 21 enlisted men. They had a diving depth of 200 feet (61.0 m).

For surface running, the boats were powered by two 390-brake-horsepower (291 kW) NELSECO diesel engines, each driving one propeller shaft. When submerged each propeller was driven by a 310-horsepower (231 kW) electric motor. They could reach 14 knots (26 km/h; 16 mph) on the surface and 11.25 knots (20.84 km/h; 12.95 mph) underwater. On the surface, the boats had a range of 2,500 nautical miles (4,600 km; 2,900 mi) at 11 knots (20 km/h; 13 mph) and 100 nmi (190 km; 120 mi) at 5 knots (9.3 km/h; 5.8 mph) submerged.

The F-class submarines were armed with four 18 inch (450 mm) torpedo tubes in the bow, no reloads were carried.

The boat was named Barracuda when she was laid down by Union Iron Works of San Francisco, California, but was renamed on 17 November 1911. She was launched on 19 March 1912 sponsored by Miss A. R. Rolph, daughter of James Rolph, the mayor of San Francisco, and commissioned on 25 June 1912 with Lieutenant (junior grade) Francis T. Chew in command.