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Class, Japanese Midget Submarines


Photograph of D class midget submarine

National Archives #80-G-339841


Specifications:


Tonnage

59.3 tons submerged

Dimensions

86'0" by 6'8" by 6'7"
26.21m by 2.03m by 2.01m

Maximum speed      

8 knots sufaced
16 knots submerged
Dive
to 330 feet
to 100  meters

Complement

5

Armament

2 18" torpedo tubes (2 torpedoes)
Machinery
1-shaft diesel (150 hp) or electric (500 hp)
Bunkerage 4.5 tons diesel  oil

Range

1000 nautical miles (1900km) at 8 knots surfaced
125 nautical miles (230km) at 2.5 knots submerged
Modifications
A number were given large conning towers and two periscopes for training Kaiten crews. A few others were fitted with an explosive warhead for suicide attack.


The Type D midget submarines, also known by the nickname Koryu, were basically improved Type C. Their larger diesel generates could recharge the batteries in eight hours. They were to be built in large numbers for defense of the home islands, but of the 570 ordered, only 115 were completed before the surrender.

References

Carpenter and Polmar (1986)

Jentschura, Jung, and Mickel (1977)

Naval History and Heritage Command (accessed 2009-12-5)



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