NAVYPEDIA

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, t	18.9
Displacement normal, t	19.0
Length, m	17.3
Breadth, m	1.30
Draught, m	1.30
No of shafts	1
Machinery	1 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

Graphics

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.