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Ise Class, Japanese Battleships


Photograph of battleship Ise

Wikipedia Commons

Schematic of battleship Ise

ONI 222-J

Specifications:


Tonnage 35,800 tons standard displacement
Dimensions 708' by 104'1" by 30'2"
215.8m by 31.72m by 9.19m
Maximum speed       25.3 knots
Complement 1376
Aircraft 1 catapult
3 seaplanes
Armament 6x2 14"/45 guns
16x1 5.5"/50 guns
4x2 5"/40 dual-purpose guns
10x2 25mm AA guns
Protection 12" (305mm) belt and bulkheads
2.25" (57mm) armored deck
1"+1"+1.25" (25mm+25mm+32mm) splinter deck
3" (76mm) deck over steering
12"/10"/4.5" (305mm/203mm/114mm) turret face/sides/roof
12" (305mm) barbette
6" (152mm) casemate
13.75" (305mm) conning tower
5.8" (229mm) uptakes
17' torpedo bulges with 1" Ducol holding bulkheads and two outer void and two inner liquid compartments
Machinery
4-shaft Kampon geared turbine (80,825 shp)
8 Kampon boilers
Bunkerage 5113 tons fuel oil
Range 7870 nautical miles (14,580km)) at 16 knots
Modifications Experimental radar installations were shipped just prior to the Midway operation, Type 22 on Hyuga and Type 21 on Ise.

Reconstructed as hybrid carrier-battleships in 1943-44. The two rear main turrets were removed and replaced with a small flight deck with a capacity of 22 aircraft. The 5"/40 dual-purpose guns were replaced with 57 25mm/60 AA guns. The range became 9449 nautical miles (17,500km) at 16 knots.

In June 1944 the antiaircraft armament was further increased, to a total of 104 25mm AA guns.

In September 1944 the antiaircraft armament included 6x30 5" (127mm) rocket launchers.

In October 1944 the catapults were removed to improve the firing arcs of the remaining main turrets.


The Ises, built in 1917-1918, were similar to the previous Fusos. However, they had an improved internal arrangement, had better siting of their main turrets, and replaced the 6" secondary battery with 5.5" guns. 

Obsolescent by 1943, the Ises were converted to hybrid carrier-battleships, with the rear main turrets removed and replaced with a small flight deck with a capacity of 22 aircraft. They were not a success. The small air group was inadequate for anything but escort duty and aircraft ferrying, and while a hybrid carrier-battleship made an impressive escort vessel, it was hardly cost-effective. As fleet carrier units, they were a complete bust.

A peculiarity of the flight decks was that they were covered with 8" (20 cm) of concrete, primarily to compensate for the loss of the two rear turrets, which made the ships too stable. The concrete also acted as a crude form of armor which did not further drain Japan's already depleted stocks of high-quality steel.


Units in the Pacific:

Hyuga       Hashirajima       Sunk by aircraft 1945-7-24 in the Inland Sea
Ise Hashirajima Sunk by aircraft 1945-7-28 in the Inland Sea

Photo Gallery

Profile of Ise

Wikimedia Commons

Photographs of Ise and Hyuga from Naval Intelligence

U.S. Navy

Schematic of Ise class from ONI 41-42

U.S. Navy

Profile of Ise as hybrid battleship-carrier

Wikimedia Commons

References

CombinedFleet.com (accessed 2007-11-29)

Evans and Peattie (1997)

Friedman (1978)

Gogin (2010; 2012;12-24)

Jentschura, Jung, and Mickel (1977)

Whitley (1998)

Worth (2001)



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