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"Otsu-Gata B2" cruiser submarines (I40) (1943 - 1944)


Ships


Name No Yard No Builder Laid down Launched Comp Fate
伊40 [I40]     Kure K K 3/1942 10.11.1942 7.1943 sunk 25.11.1943
伊41 [I41]     Kure K K 3/1942 10.11.1942 9.1943 sunk 28.11.1944
伊42 [I42]     Kure K K 3/1942 10.11.1942 11.1943 sunk 23.3.1944
伊43 [I43]     Sasebo K K 4/1942 25.10.1942 11.1943 sunk 15.2.1944
伊44 [I44]     Yokosuka K K 6/1942 5.3.1943 1.1944 sunk 29.4.1945
伊45 [I45]     Sasebo K K 7/1942 6.3.1943 12.1943 sunk 28.10.1944


Technical data


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)

Electronic equipment2-shiki 2-go radar, 93-shiki sonar, 93-shiki hydrophone, E27 ECM suite
Complement

101

Diving depth operational, m100


Standard scale images


<i>I44</i> 1945
I44 1945


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 С. 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).