graduate

Aoba Class, Japanese Heavy Cruisers


Photograph of Aoba-class heavy cruiser

Naval Historical Center photo #NH 97731

Diagram of Aoba-class heavy cruiser

Naval Historical Center photo #NH 97731


Specifications:


Tonnage

7700 tons standard displacement

Dimensions

607'6" by 57'8" by 18'7"
185.17m by 17.58m by 5.66m

Maximum speed      

32 knots

Complement

680

Aircraft

2 seaplanes
1 Kure Type 2 Model 5 catapult

Armament

3x2 8"/50 guns
4x1 4.7"/45 dual-purpose guns
4x2 25mm/60 AA guns
2x2 13mm/76 machine guns
2x4 Long Lance torpedo tubes (1 reload)

Protection

1300 tons
3" (76 mm) NVNC machinery belt inclined 9 degrees
1.4" (35 mm) NVNC middle deck
1.9" (48mm) HT upper deck
1.5" (38mm) NVNC uptakes
2" (51 mm) side/1.4" (35mm) overhead NVNC magazines
0.5" to 1" (13mm to 25mm) HT plates around steering room
1" (25mm) NVNC turret
1.4" (36mm) conning tower
Large-type torpedo bulges
Machinery
4-shaft geared turbines (102000 shp)
12 Kanpon boilers

Bunkerage

2040 tons fuel oil

Range

8223  nautical miles (15,229 km) at 14 knots
Modifications
1943-2: Replaced one 8" turret and 13mm guns with 2x3 25mm guns and 4 depth charge racks (12 depth charges).

1943-11: Restored the 8" turret. Added 1x3 and 2x2 25mm guns and Type 21 radar.

1944-7: Added 4x3, 15x1 25mm guns and Type 22 radar.

1945-3: Added 4x2 25mm guns and increased depth charge loadout.


The Aobas were completed in 1927 and incorporated a number of lessons learned from the preceding Furutakas, such as the desirability of twin main gun turrets. However, these proved too heavy for the hull, which had to be reconstructed to take the weight. The Furutakas were later modernized to very closely resemble the Aobas, which were themselves modernized in 1938-1940.


Units in the Pacific:

Aoba

Guam Invasion Force

Sunk by aircraft 1945-7-24 in Kure harbor

Kinugasa      

Guam Invasion Force      

Sunk by aircraft 1942-11-14 in the Solomons

Photo Gallery

Aoba-class cruiser from sided

U.S. Navy

Aoba-class cruiser ONI 222 page

U.S. Navy

Aoba-class cruiser ONI 41-42 page

U.S. Navy

Aoba-class cruiser from the air

Wikimedia

Aoba-class cruiser secondary armament

Wikimedia

Aoba-class cruiser ONI 41-42 page

U.S. Navy


References

Gogin (2010; accessed 2013-2-18)

Lacroix and Wells (1997)
Whitley (1995)

Worth (2001)



Valid HTML 4.01 Transitional