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Kuma Class, Japanese Light Cruisers


Photograph of Kuma
ONI 41-42
Diagram  of Kuma class
U.S. Navy


Specifications:


Tonnage

5832 tons standard displacement

Dimensions

532' by 46'6" by 16'9"
162.15m by 14.17m by 5.11m

Maximum speed      

36 knots

Complement

439

Aircraft

1 Model 1 or Model 3 catapult
1 seaplane

Armament

7x1 5"/50 dual-purpose guns
2x2 25mm/60 AA guns
4x2 24" torpedo tubes with one reload
48 Type 1-B mines

Protection

238.3 tons
1.5" (38mm) + 1" (25mm) HT machinery belt
1.1" (28mm) HT deck (machinery)
1.8" (45mm) HT deck (magazines)
0.8" (20mm) gun shields
1.5" (38mm) + 0.5" (12mm) HT conning tower
Machinery
4-shaft Mitsubishi-Parsons-Gihon geared turbines (90,000 shp)
12 Kampon boilers

Bunkerage

1260 tons fuel oil

Range

6000 nautical miles (11,000 km) at 14 knots
9000 nautical miles (17,000 km) at 10 knots

Modifications
1943-11: Tama and Kiso landed two single 5" guns in return for a 1x2 5" mount, 4x3, 6x1 25mm guns, and 2 13mm/76 machine guns. Tama adds Type 21 radar.
1944-6 Tama and Kiso add 1x3, 2x2, 12x1 25mm guns, 5-8 13mm machine guns, and Type 22 radar. Tama adds 2 depth charge racks (36 depth charges)


The Kumas were completed in 1920-21 as general-purpose light cruisers, capable of acting as destroyer squadron leaders, as escorts or scouts for the battle fleet, or for commerce protection. They were essentially enlarged Tenryus, and subsequent classes of Japanese light cruisers were very similar in specifications. The Kumas were strongly built and had excellent seakeeping, but their crew accomodations were cramped, hot, and noisy. The class was extremely maneuverable, one commander boasting that his ship “could maneuver on the crest of a wave.” They were powered by then-new Mitsubishi-Parsons-Gihon turbines, which had high-pressure and low-pressure halves that were fed steam in series for economical cruising and in parallel at maximum power. Two of the boilers were originally mixed-fired boilers that could handle either fuel oil or coal, but these had been removed long before war broke out. Protection was very light at 3.7% of displacement, being designed against the 4" guns typical of U.S. destroyers of the time.

The main armament was arranged as five single mounts on the centerline and two single wing mounts. This meant that only six of the seven guns contributed to the broadside,but it allowed four guns to fire straight ahead.

The Kumas were badly outdated by the start of the Pacific War.  Several redesigns were considered, including conversion to minelayers or training vessels.  Two of the class (Oi and Kitakami) were converted to torpedo cruisers before the start of the war and are treated as a separate class.


Units in the Pacific:

Kiso

Ominato

Sunk by aircraft 1944-11-13 off Manila

Tama

Ominato

Torpedoed 1944-10-25 off Luzon by Jallao

Kuma      

Close Covering Force (Takahashi)     

Torpedoed 1944-1-11 off Penang by Tally Ho!


Photo Gallery

Forward part of Kuma

U.S. Navy

ONI 41-42 photo page for Kuma class

U.S. Navy

ONI 41-42 specs page for Kuma class

U.S. Navy


References

Gogin (2010; accessed 2013-3-12)

Lacroix and Wells (1997)
Whitley (1995)

Worth (2001)


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