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B2 Class, Japanese Submarines


Photograph of B2 class submarine

Wikipedia Commons


Specifications:


Tonnage

2320 tons standard displacement
2624 tons surfaced
3700 tons submerged

Dimensions

350'8" by 30'6" by 17'0"
106.88m by 9.30m by 5.18m

Maximum speed      

23.5 knots (surfaced)
8 knots (submerged)
Dive to 330 feet (100m)
Complement
100
Aircraft 1 seaplane

Armament

1 5.5"/50 gun
1x2 25mm/60 machine gun
6 21" torpedo tubes (17 torpedoes)
Machinery
2-shaft diesel (11,000 hp) or electric (2000 hp)
Range 14,000 nautical miles (23,000 km) at 16 knots surfaced
96 nautical miles (150 km) at 3 knots submerged
Modifications
Some units replaced the aircraft facilities with a second 5.5" gun.
1944: I-44 converted to a kaiten carrier by removing the aircraft facilities and 5.5" gun and adding fittings for six kaiten. Surviving units likely received Type 13 air search radar and Type 22 surface search radar.

The B2s were virtually identical with the B1s except for less powerful machinery. An additional eight units were projected but not authorized.


Units in the Pacific:

I-40      

Completed 1943-7-31 (Kure)      

Missing from 1943-12 off Gilberts
I-41 Completed 1943-9-18 (Kure)       Sunk 1944-11-18 off Samar by Lawrence C. Taylor and aircraft from Anzio
I-42 Completed 1943-11-3 (Kure)       Torpedoed 1944-3-23 off Angaur by Tunny
I-43 Completed 1943-11-5 (Sasebo)       Torpedoed 1944-2-15 off Guam by Aspro
I-45 Completed 1943-12-28 (Sasebo)       Sunk 1944-10-28 off Surigao by Whitehurst
I-44 Completed 1944-1-31 (Yokosuka)       Sunk 1944-4-10 off Okinawa by Fieberling



References

Carpenter and Polmar (1986)

CombinedFleet.com (accessed 2009-10-31)

Jentschura, Jung, and Mickel (1977)

Worth (2001)


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