The Pacific War Online Encyclopedia
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|Tonnage||5832 tons standard displacement
|Dimensions||532' by 46'6" by 15'9"
162.15m by 14.17m by 4.80m
|Maximum speed||31.7 knots|
4x2 25mm/60 AA guns
10x4 Long Lance torpedo tubes (no reloads)
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
||4-shaft Mitsubishi-Parsons-Gihon turbines (90,000 shp)
12 Kampon boilers
1260 tons fuel oil
|Range||4000 nautical miles (7400 km) at 14 knots|
The Ois were completed in 1920-21 as part of the Kuma class. They were converted to torpedo cruisers before the start of the war, and carried a massive arsenal of these weapons. Their development was supported by a new doctrine for night fighting tactics in which massive numbers of Long Lance torpedoes would be launched outside battleship gun range at night to ravage the American fleet as it approached Japan. For reasons of secrecy, the conversion was not to take place until the fleet was ordered to transition to a war footing, which took place on 15 August 1941.
The conversion removed the three aft 5.5" guns
(leaving only the four forward guns) and added ten sets of quadruple
torpedo tubes. The tubes had no reloads, but a rail system was
installed to allow torpedoes to be shifted from one side of the ship to
the other. The addition of so many torpedoes cost the ships almost five
knots of speed and significantly reduced their endurance.
Following the battle of Midway, the ships were
converted to fast transports by removing some of their torpedo tubes.
Plans to remove additional tubes to make room for additional landing
craft were never carried out, but Kitakami
was eventually converted into a Kaiten
|Spelled Ooi or Ohi in some references.
Torpedoed 1944-7-19 in the South
China Sea by Flasher.
Gogin (2010; accessed 2013-3-19)
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