Junsen type submarine
| Class overview | |
|---|---|
| Name: | Junsen type submarines |
| Builders: | |
| Operators: |
 Imperial Japanese Navy
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| Succeeded by: | |
| Subclasses: |
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| Built: | 1923-1938 |
| In commission: | 1926-1945 |
The Junsen type submarine (巡潜型潜水艦, "巡洋潜水艦" Junsen-gata sensuikan, "Cruiser submarine"?) was a ship class of submarines of the Imperial Japanese Navy (IJN). There were four submarine designs of the Junsen type: J1, a modified J1, J2 and the J3.
The Junsen type submarines were divided into four classes:
Four boats were built in 1923-1929. Genealogy of the large-size submarine in the IJN began with U-142. Japan received six U-boats from Germany as reparations of World War I. The IJN copied U-125, one of the six, producing the I-21-class minelayer submarine. The IJN could not find an optimal design of fleet submarine, so they and Kawasaki Heavy Industries sent many technical officers to the United Kingdom and Germany and got drawings of advanced submarines. The British L class became the Kaidai I, the K class became the Kaidai II and U-142 become Junsen I.
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