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Japanese submarine I-51

Japanese submarine I51 1924.jpg
I-51 in 1924
History
Japan
Name: I-51
Ordered: 1918 Fiscal Year
Builder: Kure Naval Arsenal
Laid down: 6 April 1921, as S22
Launched: 29 November 1921
Completed: 20 June 1924, as Submarine 44
Commissioned: 1 November 1924, as I-51
Struck: 1 April 1940
Homeport: Kure Naval District
Fate: Scrapped 1940
General characteristics
Class and type: Kaidai-class submarine (Type I)
Displacement:
  • 1,833 long tons (1,862 t) surfaced
  • 2,602 long tons (2,644 t) submerged
Length: 99.44 m (326 ft 3 in)
Beam: 8.81 m (28 ft 11 in)
Draught: 4.6 m (15 ft 1 in)
Propulsion:
  • 4 × Sulzer diesel engines,5,200 hp (3.9 MW)
  • 4 x Electric motors, 2,000 hp (1.5 MW)
Speed:
  • 18.5 knots (34.3 km/h; 21.3 mph) (surfaced)
  • 8.4 kn (15.6 km/h; 9.7 mph) (submerged)
Range:
  • 20,000 nmi (37,000 km) @ 10 kn (19 km/h; 12 mph) (surfaced)
  • 100 nmi (190 km) @ 4 kn (7.4 km/h; 4.6 mph) (submerged)
Endurance: 47.5 m (156 ft)
Complement: 70 officers and men
Armament:

Japanese submarine I-51 (伊号第五一潜水艦?, I-gō Dai Gojū-ichi sensuikan) was the lead vessel and prototype of the Kaidai-class submarines of the Imperial Japanese Navy, which served in World War II.

Following World War I, the Imperial Japanese Navy General Staff began to re-consider submarine warfare as an element of fleet strategy. Before the war, the Japanese Navy regarded submarines as useful only for short-range coastal point defense. However, based on the success of the Imperial German Navy in deployment of long-range cruiser-submarines for commerce raiding Japanese strategists came to realize possibilities for using the weapon for long range reconnaissance, and in a war of attrition against an enemy fleet approaching Japan. Procurement for a large, long-range Japanese submarine was authorized in fiscal 1918 under the Eight-six fleet program, under the designation S22.

Project S22 was based on the latest Royal Navy design, the British K class submarine. Japanese ties to Great Britain via the Anglo-Japanese Alliance were still strong. Project S22 was laid down at Kure Naval Arsenal on 6 April 1921, launched on 29 November 1921 and completed on 20 June 1924.


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