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"KAIRYU" midget submarines (?) (1945)


Photo



Kairyu type

Ships


Names Builders Commissioned Losses Transfers Discarding

760 boats ordered (213 completed, 207 under construction in 8.1945)

Yokosuka, Navy engineers college: 2 boats

Fujinagata, Osaka: 10 boats

Hakodate Dock, Hakodate: 41 boats

Hayashikane, Shimonoseki: 10 boats

Hitachi, Innoshima: 5 boats

Hitachi, Kasado: 8 boats (6 completed)

Mitsubishi, Yokohama: 35 boats

Osaka, Osaka: 10 boats

Hitachi/Sakurajima, Osaka: 4 boats

Uraga, Tokyo: 50 boats

Kawaminami, Uranosaki: 10 boats

Yokosuka K K: 237 boats (207 completed)

1945: 213 boats

unknown

none

surrendered 8.1945 and BU: all survived


Technical data


Displacement standard, t18.9
Displacement normal, t

19.0

Length, m

17.3

Breadth, m1.30
Draught, m1.30
No of shafts

1

Machinery1 Isuzu gasoline engine / 1 electric motor
Power, h. p.85 / 80
Max speed, kts

7.5 / 10

Fuel, t 
Endurance, nm(kts)450(5) / 36(3)
Armament

2 - 450 TT (side drop-collars, 2) or 600-kg explosive charge

Complement

2

Diving depth operational, m 


Standard scale images


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"Kairyu" 1945


Graphics


<i>Kairyu</i> type
Kairyu type


Project history

Along with family of midgets, conducting the family tree from A type (A, B, C and D types), in the end of war the IJN has replenished with boats of the smaller size of Kairyu type. Fixed side-fins amidships were prominent feature. The designed armament consisted from two TTs, however shortage of torpedoes has led to occurrence of a variant of a boat with 600kg TNT charge instead of TTs, that actually converted them to human torpedoes. Serial building of type Kairyu boats has begun in February, 1945, for acceleration of works it was conducted by a section method (the boat shared on three sections). Plans provided to have by September, 1945 760 midgets of this type, however by August 213 boats have been completed only, and 207 more were at various stages of building.

Modernizations

None.

Naval service

Fates of boats are unknown.