USS Tusk

	Tusk, after the GUPPY II conversion
History
United States
Name	USS Tusk
Builder	Cramp Shipbuilding Company, Philadelphia
Yard number	560
Laid down	23 August 1943
Launched	8 July 1945
Commissioned	11 April 1946
Decommissioned	18 October 1973
Stricken	18 October 1973
Identification	SS-426
Fate	Transferred to the Republic of China, 18 October 1973
Republic of China
Name	ROCS Hai Pao
Acquired	18 October 1973
Identification	SS-792
Status	Afloat at Tsoying Naval Base, Kaohsiung as of November 2020
General characteristics (As completed)
Class and type	Balao-class diesel-electric submarine
Displacement	1,526 long tons (1,550 t) surfaced; 2,424 long tons (2,463 t) submerged;
Length	311 ft 9 in (95.02 m)
Beam	27 ft 3 in (8.31 m)
Draft	16 ft 10 in (5.13 m) maximum
Propulsion	4 × Fairbanks-Morse Model 38D8-⅛ 10-cylinder opposed piston diesel engines driving electrical generators; 2 × 126-cell Sargo batteries; 2 × low-speed direct-drive Elliott electric motors; two propellers ; 5,400 shp (4.0 MW) surfaced; 2,740 shp (2.0 MW) submerged;
Speed	20.25 knots (37.50 km/h) surfaced; 8.75 knots (16.21 km/h) submerged;
Range	11,000 nautical miles (20,000 km) surfaced at 10 knots (19 km/h)
Endurance	48 hours at 2 knots (3.7 km/h) submerged; 75 days on patrol;
Test depth	400 feet (120 m)
Complement	10 officers, 70–71 enlisted
Armament	10 × 21-inch (533 mm) torpedo tubes; 6 forward, 4 aft; 24 torpedoes; 1 × 5-inch (127 mm) / 25 caliber deck gun; Bofors 40 mm and Oerlikon 20 mm cannon;
General characteristics (Guppy II)
Class and type	GUPPY II
Displacement	1,870 long tons (1,900 t) surfaced; 2,440 long 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	Snorkel added; Batteries upgraded to GUPPY type, capacity expanded to 504 cells (1 × 184 cell, 1 × 68 cell, and 2 × 126 cell batteries);
Speed	Surfaced:; 18.0 knots (33.3 km/h) maximum; 13.5 knots (25.0 km/h) cruising; Submerged:; 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;
Range	15,000 nm (28,000 km) surfaced at 11 knots (20 km/h)
Endurance	48 hours at 4 knots (7.4 km/h) submerged
Complement	9–10 officers; 5 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); all guns removed;

USS Tusk (SS-426), a Balao-class submarine, was the only ship of the United States Navy to be named for the tusk, an alternate name for the cusk, a large edible saltwater fish related to the cod. Her keel was laid down on 23 August 1943 at Philadelphia by the Cramp Shipbuilding Company. She was launched on 8 July 1945 sponsored by Mrs. Carolyn Park Mills, and commissioned on 11 April 1946.

Tusk and Trumpetfish are erroneously listed with the Tench class in some sources, as their hull numbers are in the sequence assigned to that class.

^ ^a ^b ^c ^d ^e Friedman, Norman (1995). U.S. Submarines Through 1945: An Illustrated Design History. Annapolis, Maryland: United States Naval Institute. pp. 285–304. ISBN 1-55750-263-3.
^ ^a ^b ^c ^d ^e ^f ^g Bauer, K. Jack; Roberts, Stephen S. (1991). Register of Ships of the U.S. Navy, 1775-1990: Major Combatants. Westport, Connecticut: Greenwood Press. pp. 275–280. ISBN 0-313-26202-0.
^ ^a ^b ^c ^d ^e ^f U.S. Submarines Through 1945 pp. 305–311
^ ^a ^b ^c ^d ^e Bauer, K. Jack; Roberts, Stephen S. (1991). Register of Ships of the U.S. Navy, 1775–1990: Major Combatants. Westport, Connecticut: Greenwood Press. pp. 275–282. ISBN 978-0-313-26202-9.
^ U.S. Submarines Through 1945 pp. 261–263
^ ^a ^b ^c U.S. Submarines Through 1945 pp. 305–311
^ ^a ^b ^c ^d ^e ^f ^g ^h U.S. Submarines Since 1945 pp. 242
^ ^a ^b ^c ^d ^e ^f Friedman, Norman (1994). U.S. Submarines Since 1945: An Illustrated Design History. Annapolis, Maryland: United States Naval Institute. pp. 11–43. ISBN 1-55750-260-9.

[FriedmanSubs1-dates-1] Friedman, Norman (1995). U.S. Submarines Through 1945: An Illustrated Design History. Annapolis, Maryland: United States Naval Institute. pp. 285–304. ISBN 1-55750-263-3.

[Register-2] ^ ^a ^b ^c ^d ^e ^f ^g Bauer, K. Jack; Roberts, Stephen S. (1991). Register of Ships of the U.S. Navy, 1775-1990: Major Combatants. Westport, Connecticut: Greenwood Press. pp. 275–280. ISBN 0-313-26202-0.

[FriedmanSubs1-specs-3] ^ ^a ^b ^c ^d ^e ^f U.S. Submarines Through 1945 pp. 305–311

[Register_275–282-4] Bauer, K. Jack; Roberts, Stephen S. (1991). Register of Ships of the U.S. Navy, 1775–1990: Major Combatants. Westport, Connecticut: Greenwood Press. pp. 275–282. ISBN 978-0-313-26202-9.

[FriedmanSubs1-engines_261–263-5] U.S. Submarines Through 1945 pp. 261–263

[FriedmanSubs1-specs_305–311-6] U.S. Submarines Through 1945 pp. 305–311

[FriedmanSubs2-specs-7] ^ ^a ^b ^c ^d ^e ^f ^g ^h U.S. Submarines Since 1945 pp. 242

[FriedmanSubs2-chap2-8] ^ ^a ^b ^c ^d ^e ^f Friedman, Norman (1994). U.S. Submarines Since 1945: An Illustrated Design History. Annapolis, Maryland: United States Naval Institute. pp. 11–43. ISBN 1-55750-260-9.

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History
Tusk, after the GUPPY II conversion
United States
Name	USS Tusk
Builder	Cramp Shipbuilding Company, Philadelphia^[1]
Yard number	560
Laid down	23 August 1943^[1]
Launched	8 July 1945^[1]
Commissioned	11 April 1946^[1]
Decommissioned	18 October 1973^[1]
Stricken	18 October 1973^[2]
Identification	SS-426
Fate	Transferred to the Republic of China, 18 October 1973
Republic of China
Name	ROCS Hai Pao
Acquired	18 October 1973
Identification	SS-792
Status	Afloat at Tsoying Naval Base, Kaohsiung as of November 2020
General characteristics (As completed)
Class and type	Balao-class diesel-electric submarine^[2]
Displacement	1,526 long tons (1,550 t) surfaced^[2] 2,424 long tons (2,463 t) submerged^[2]
Length	311 ft 9 in (95.02 m)^[2]
Beam	27 ft 3 in (8.31 m)^[2]
Draft	16 ft 10 in (5.13 m) maximum^[2]
Propulsion	4 × Fairbanks-Morse Model 38D8-⅛ 10-cylinder opposed piston diesel engines driving electrical generators^[4]^[5] 2 × 126-cell Sargo batteries^[6] 2 × low-speed direct-drive Elliott electric motors^[4] two propellers ^[4] 5,400 shp (4.0 MW) surfaced^[4] 2,740 shp (2.0 MW) submerged^[4]
Speed	20.25 knots (37.50 km/h) surfaced^[3] 8.75 knots (16.21 km/h) submerged^[3]
Range	11,000 nautical miles (20,000 km) surfaced at 10 knots (19 km/h)^[3]
Endurance	48 hours at 2 knots (3.7 km/h) submerged^[3] 75 days on patrol
Test depth	400 feet (120 m)^[3]
Complement	10 officers, 70–71 enlisted^[3]
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
General characteristics (Guppy II)
Class and type	GUPPY II
Displacement	1,870 long tons (1,900 t) surfaced^[8] 2,440 long tons (2,480 t) submerged^[8]
Length	307 ft (94 m)^[7]
Beam	27 ft 4 in (8.33 m)^[7]
Draft	17 ft (5.2 m)^[7]
Propulsion	Snorkel added^[8] Batteries upgraded to GUPPY type, capacity expanded to 504 cells (1 × 184 cell, 1 × 68 cell, and 2 × 126 cell batteries)^[8]
Speed	Surfaced: 18.0 knots (33.3 km/h) maximum 13.5 knots (25.0 km/h) cruising Submerged: 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^[8]
Range	15,000 nm (28,000 km) surfaced at 11 knots (20 km/h)^[7]
Endurance	48 hours at 4 knots (7.4 km/h) submerged^[7]
Complement	9–10 officers 5 petty officers 70 enlisted men^[7]
Sensors and processing systems	WFA active sonar JT passive sonar Mk 106 torpedo fire control system^[7]
Armament	10 × 21 inch (533 mm) torpedo tubes (six forward, four aft)^[7] all guns removed^[8]