Japanese submarine I-51
I-51 in 1924
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| History | |
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 Japan
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| 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: | |
| 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: |
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| Speed: |
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| Range: |
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| Endurance: | 47.5 m (156 ft) |
| Complement: | 70 officers and men |
| Armament: |
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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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