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fighting ships of the world

IMPERIAL JAPANESE NAVY (JAPAN)

SUBMARINES

"Kaidai 6a" attack submarines (1934-1937)

I68 1941

Name No Yard No Builder Laid down Launched Comp Fate
68 <I68>, 5/1942- 168 <I168>     Kure K K 6/1931 26/6/1933 7/1934 sunk 27/7/1943
69 <I69>, 5/1942- 169 <I169>     Mitsubishi, Kobe 12/1931 15/2/1934 9/1935 sunk 4/4/1944
70 <I70>     Sasebo K K 1/1933 14/6/1934 11/1935 sunk 10/12/1941
71 <I71>, 5/1942- 171 <I171>     Kawasaki, Kobe 2/1933 25/8/1934 12/1935 sunk 1/2/1944
72 <I72>, 5/1942- 172 <I172>     Mitsubishi, Kobe 12/1933 20/6/1935 1/1937 sunk 10/11/1942
73 <I73>     Kawasaki, Kobe 4/1934 20/6/1935 1/1937 sunk 27/1/1942

  

Displacement standard, t

1400

Displacement normal, t

1785 / 2440

Length, m

98.4 pp 102.6 wl 104.7 oa

Breadth, m

8.20

Draught, m

4.58

No of shafts

2

Machinery

2 Kampon diesels / 2 electric motors

Power, h. p.

9000 / 1800

Max speed, kts

23 / 8.2

Fuel, t

diesel oil 230

Endurance, nm(kts) 14000(10) / 65(3)
Armament

I68 - 70: 1 x 1 - 100/50 88-shiki, 1 x 1 - 13.2/76, 6 - 533 TT (4 bow, 2 stern, 14)

I71 - 73: 1 x 1 - 120/45 11-shiki, 1 x 1 - 13.2/76, 6 - 533 TT (4 bow, 2 stern, 14)

Sensors 91-shiki sonar, MV-shiki hydrophone

Complement

60 - 84

Diving depth operational, m

I68, 69: 70

I70 - 73: 75

Ship project history: Kaidai 6a (Large Admiralty 6a) type. Built under 1st Supplementary programme of of 1931. Further development of Kaidai 5 type, differed in one and a half time of more powerful diesels and raised speed. Double-hulled, endurance was about 45 days.

I172 was also supposed to convert in late 1942 to transport, however it is not known, whether it has been made before her loss.

Modernizations: Autumn 1942, I171: was converted to transport submarine; - 1 x 1 - 120/45, torpedoes stowage was decreased; + 1 14m Daihatsu-type landing craft, deck cargo

Naval service: I70 was sunk 10/12/1941 NE off Oahu by US carrier aircraft. I73 was sunk 27/1/1942 W off Midway by US submarine Gudgeon. I172 was sunk 10/11/1942 at Guadalcanal by US destroyer Southard. I168 presumably was sunk 27/7/1943 at New Hanover by US submarine Scamp. I171 was sunk 1/2/1944 at Buka Island by US destroyers Guest and Hudson. I169 was sunk 4/4/1944 at Truk by US aircraft.

I68

 

Ivan Gogin, 2008-14