Type KD1 (I-51) Kaidai I type

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This submarine was assigned the project number S22 and the objective was only to serve as a prototype for this particular class of submarines. The prototype was also named as Kaidai I, I-51, and was basically developed by following  World War I designs of German submarines. We note that Japan joined Britain and USA against Germany during the First World War and consequently was one the winner side.

submarine japanese I-51 kaidan I

The Imperial Japanese Navy Submarine I-51 Kaidan I in 1924, after being completed sailing during late evening near Kure.

Japan as victorious power received some pacific colonies from Germany as well as war compensations. Moreover, it also received some submarines which were used to develop the technologies and research on the submarine warfare. The submarine warfare had not been explored too much by the Imperial Japanese Navy  since Japan abandoned the French Navy school or doctrine to follow the British one early XX century. Coming back to our main purpose, which is the submarine I-51, we can say that she was completed  8 years after the first war world ended, in 1924. New engines were added in 1932. Before the pacific war started, she was declared obsolete and was scrapped in 1941. Therefore, the submarine I-51 had a peaceful life since was never involved in real combat.


▽ Imperial Japanese Navy – Nihon Kaigun


sphere Nihon Kaigun organization



sphere Aircraft Carriers of the Imperial Japanese Navy 



sphere Battleships of the Imperial Japanese Navy



sphere Heavy Cruisers of the Imperial Japanese Navy



sphere Light Cruisers of the Imperial Japanese Navy



sphere Destroyers of the Imperial Japanese Navy



sphere Submarines of the Imperial Japanese Navy



sphere Auxiliary Ships



sphere The Time Line of ships of the Imperial Japanese Navy



sphere Naval Air Groups



sphere Naval Landing Forces 1928-1945



sphere Secret Weapons of the IJN



sphere Strategic Plans of the IJN


▽ Simulations & Wargames

▽ World War II: Pacific Theater


sphere War in the Pacific: Admiral Edition



sphere The Empire of the Sun (2nd Ed.)



sphere Pacific War



sphere Pacific War (2nd Ed.)

▽Japan’s Maritime Self-Defense Force (JMSDF)


sphere The organization of the JMSDF



sphere The Regional District Forces



sphere Helicopter Destroyers DDH



sphere Guided Missile destroyers DDG



sphere Destroyers DD



sphere Tank Landing Ships LST



sphere Submarines SS



sphere Support and Auxiliary ships



sphere The aviation of the JMSDF



sphere Naval landing forces of the JMSDF



sphere Future projects of the JMSDF



sphere The strategy of the JMSDF



sphere News & manoeuvres


▽ Simulations & Wargames

▽ World War II: European Theater


sphere Unconditional Surrender



sphere The Supreme commander


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