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fighting ships of the world

IMPERIAL JAPANESE NAVY (JAPAN)

SUBMARINES

"Otsu-gata B2" cruiser submarines (1943-1944)

I44 1945

Name No Yard No Builder Laid down Launched Comp Fate
40 <I40>     Kure K K 3/1942 10/11/1942 7/1943 sunk 25/11/1943
41 <I41>     Kure K K 3/1942 10/11/1942 9/1943 sunk 28/11/1944
42 <I42>     Kure K K 3/1942 10/11/1942 11/1943 sunk 23/3/1944
43 <I43>     Sasebo K K 4/1942 25/10/1942 11/1943 sunk 15/2/1944
44 <I44>     Yokosuka K K 6/1942 5/3/1943 1/1944 sunk 29/4/1945
45 <I45>     Sasebo K K 7/1942 6/3/1943 12/1943 sunk 28/10/1944

  

Displacement standard, t

2230

Displacement normal, t

2624 / 3700

Length, m

102.4 pp 106.9 wl 108.7 oa

Breadth, m

9.30

Draught, m

5.20

No of shafts

2

Machinery

2 Kampon diesels / 2 electric motors

Power, h. p.

11000 / 2000

Max speed, kts

23.5 / 8

Fuel, t

diesel oil 220

Endurance, nm(kts) 14000(16) / 96(3)
Armament

most: 1 x 1 - 140/40 11-shiki, 1 x 2 - 25/60 96-shiki, 6 - 533 TT (bow,17), 1 catapult, 1 seaplane (E14Y1)

some: 2 x 1 - 140/40 11-shiki, 1 x 2 - 25/60 96-shiki, 6 - 533 TT (bow, 17)

Sensors 2-shiki 2-go radar, 93-shiki sonar, 93-shiki hydrophone, E27 ECM suite

Complement

101

Diving depth operational, m

100

Ship project history: Otsu-Gata B2 type. Built under the 1941 War programme. Practically repeated Otsu-Gata B1, differing by some smaller engine power. 8 more submarines were supposed to built under the 1942 programme (Nos 702-709), but works have not been begun.

Modernizations: early 1945, I44: - 1 x 1 - 140/40, catapult with hangar and seaplane; + 4 Kaiten human torpedoes.

3/1945, I44: + 2 Kaiten human torpedoes

Naval service: I40 was lost in December, 1943 in Gilbert's Islands area. I43 15/2/1944 was sunk SE off Guam by US submarine Aspro. I42 was sunk 23/3/1944 off Palau by US submarine Tunny. I45 after 27/10/1944 was lost, possibly, she was sunk 28/10/1944 NE off Surigao Strait by US escort destroyer Whitehurst. I41 was sunk 18/11/1944 E off Samar by US escort destroyer Lawrence . Taylor and carrier aircraft. I44 was damaged 26/5/1944 at Truk by US submarine Permit, after 4/4/1945 she was lost, possibly sunk 29/4/1945 in Philippine Sea by US carrier aircraft (under other data, sunk 10/4/1945 S from Okinawa by US escort destroyer Fieberling).

Ivan Gogin, 2008-14