Myoko Class, Japanese Heavy Cruisers

IJN Haguro, a Myoko-class heavy cruiser

Naval Historical Center #NH 88373

Schematic of Myoko-class cruiser

ONI 222


Tonnage 13,000 tons standard displacement
Dimensions 668'6" by 68' by 20'8"
203.76m by 83.64m by 6.30.
Maximum speed       33.8 knots
Complement 773
Aircraft 2 Kure Type 2 Model 51 catapult
3 seaplanes
Armament 5x2 8"/50 Mark 2 guns
4x2 5"/40 dual-purpose guns
4x2 25mm AA guns
2x2 13mm AA guns
4x4 Long Lance torpedo tubes (24 torpedoes)
Protection 2032.5 tons
4" (102mm) NVNC belt inclined 12 degrees
Torpedo bulges with 2.3" (58mm) HT holding bulkhead
1.4" (35mm) NVNC middle  deck
1.4" (35mm) NVNC lower deck
3.5" (89mm) NVNC uptakes
3.5" (89mm) bulkheads
1" (25mm) NVNC turrets
4-shaft Kanpon geared turbines (130,000 shp)
12 Kampon boilers
Bunkerage 2214 tons fuel oil
Range 7000 nautical miles (13,000 km) at 14 knots
5000 nautical miles (9300 km) at 18 knots

1943: 2x2 25mm guns added. 2x2 13mm replaced with 2x2 25mm guns. Type 21 radar installed.

Late 1943: 8x1 25mm added. Type 22 radar dded to Nachi, Ashigara.

1944: Myoko, Haguro added 4x3, 16x1 25mm guns. Nachi, Ashigara added 2x2, 20x1 25mm guns. Type 13 radar installed. One bank of torpedo tubes landed.

The Myokos were Japan's first treaty cruisers, completed in 1928-29, and were very powerful units, with more firepower and protection than any contemporary foreign counterpart. This is not surprising, considering that the designers were convinced they could fit much more onto the legal displacement than they actually could. Once it was clear the cruisers would violate the treaty limit of 10,000 tons, a "might as well be hanged for a sheep as a lamb" attitude seemed to prevail and additional modifications pushed the ships even further past the limit. The ships had unusually good habitability and Haguro once served as guest ship for the Emperor. They cost ¥21,900,000 apiece.

As a weight-saving measure, the side belt was made an integral part of the hull and the ships were given undulating flush decks. These measures proved inadequate to give the necessary economy of weight. These ships were built with the controversial centerline bulkhead (see Oyodo).

Units in the Pacific:


Close Covering Force (Takahashi) sailing from Magong      

Torpedoed 1945-6-8 off Singapore by Stygian


Legaspi Support Force (Takagi) off Davao

Torpedoed 1945-5-16 off Penang by British destroyers


Legaspi Support Force (Takagi) off Davao


Legaspi Support Force (Takagi) off Davao

Sunk by aircraft 1944-11-5 off Corregidor

Photo Gallery

Side view of Myoko-class heavy cruiser

U.S. Navy

Myoko-class cruiser, side view


Myoko-class cruiser, forward view


Myoko-class cruiser, bow view


Myoko-class cruiser preparing to catapult a seaplane


View from side of superstructure of Myoko-class cruiser


References (accessed 2007-12-12)

Gogin (2010; accessed 2013-2-14)

Lacroix and Wells (1997)
Whitley (1995)

Worth (2001)

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