SS-490 USS Volador

Namesake. The Volador, or California flying fish (Cheilopogon pinnatibarbatus californicus)
Builder. Portsmouth Naval Shipyard, Kittery, ME
Laid down. 15 Jun 1945
Launched. 21 May 1948
Commissioned. 1 Oct 1948
Decommissioned. 18 Aug 1972
Stricken . 5 Dec 1977
Fate. Transferred to Italy, 18 Aug 1972; sold to Italy 5 Dec 1977

General characteristics (Completed as GUPPY II)
Class and type. Tench-class diesel-electric submarine
Displacement:
1,870 tons (1,900 t) surfaced
2,440 tons (2,480 t) submerged
Length. 307 ft (94 m)
Beam. 27 ft 4 in (8.33 m)
Draft. 17 ft (5.2 m)
Propulsion:
4 × Fairbanks-Morse Model 38D8-⅛ 10-cylinder opposed piston diesel engines, equipped with a snorkel, driving electrical generators
1 × 184 cell, 1 × 68 cell, and 2 × 126 cell GUPPY-type batteries (total 504 cells)
2 × low-speed direct-drive Elliott electric motors
two propellers
Speed. 18.0 knots (33.3 km/h) maximum, 13.5 knots (25.0 km/h) cruising (Surfaced): 16.0 knots (29.6 km/h) for ½ hour, 9.0 knots (16.7 km/h) snorkeling, 3.5 knots (6.5 km/h) cruising (Submerged)
Range. 15,000 nm (28,000 km) surfaced at 11 knots (20 km/h)
Endurance. 48 hours at 4 knots (7 km/h) submerged
Test depth. 400 ft (120 m)
Complement. 9–10 officers, 5 Chief Petty Officers, 70 enlisted men
Sensors and processing systems:
WFA active sonar
JT passive sonar
Mk 106 torpedo fire control system
Armament:
10 × 21-inch (533 mm) torpedo tubes (six forward, four aft)

General characteristics (Guppy III)
Displacement:
1,975 tons (2,007 t) surfaced
2,450 tons (2,489 t) submerged
Length. 321 ft (97.8 m)
Beam. 27 ft 4 in (7.4 m)
Draft. 17 ft (5.2 m)
Speed. 17.2 knots (31.9 km/h) maximum, 12.2 knots (22.6 km/h) cruising (Surfaced); 14.5 knots (26.9 km/h) for ½ hour, 6.2 knots (11.5 km/h) snorkeling, 3.7 knots (6.9 km/h) cruising (Submerged)
Range. 15,900 nm (29,400 km) surfaced at 8.5 knots (16 km/h)
Endurance. 36 hours at 3 knots (6 km/h) submerged
Complement. 8–10 officers, 5 petty officers, 70–80 enlisted men
Sensors and processing systems:
BQS-4 active search sonar
BQR-2B passive search sonar
BQG-4 passive attack sonar