japanese cruiser japanese cruiser heavy cruiser built imperial_japanese_navy world war lead ship class converted light aircraft carrier completion conversion delayed finally stopped march order concentrate building small submarines scrapped naval arsenal beginning design description originally designed ship length meters overall beam meters draft meters displaced metric tons long tons standard load metric tons long tons load fitted geared steam turbine sets total shaft horsepower driving meter propeller steam provided drum water tube boilers intended ship maximum speed knots mph carried metric tons long tons fuel oil gave estimated range nautical miles knots mph armament main armament class intended caliber 3rd year type guns mounted twin turrets forward aft superstructure forward turrets level turret guns maximum elevation maximum range secondary armament consist caliber type anti aircraft guns twin mounts maximum range meters maximum ceiling meters ships intended equipped twin type light guns abreast funnel maximum range meters effective ceiling meters maximum effective rate fire rounds minute frequent need change round magazines twin type machine gun mounts supposed mounted bridge rounds gun class ships intended armed rotating quadruple type torpedo tube mounts broadside ship carried type torpedoes commonly referred post war literature long lance tubes reserve quick gear installed mount allowed reserve torpedoes loaded minutes ideal conditions early warning provided type model air search radar mounted foremast type passive system fitted bow ships designed carry aircraft platform funnel mainmast consisted seat seat launched pair aircraft aircraft platform armor ship waterline armoured belt ran way double extended forward rear magazines fore aft turrets machinery spaces millimeters thick millimeters thick sides magazines outer ends fore aft machinery compartments protected millimeter transverse bulkhead magazines protected fore aft transverse bulkheads millimeters thick thickness armored deck ranged millimeters flat millimeters slope sides conning tower millimeters thick roof millimeters thick main gun turrets millimeters armor sides roof barbette armor ranged millimeters thickness conversion aft turbine sets aft boilers propeller shafts removed propellers exhaust remaining boilers downward curving funnel starboard hull space available tanks metric tons long tons capacity additional fuel oil tanks bomb torpedo magazines capacity bombs torpedoes ship carry metric tons long tons oil nautical miles speed knots mph reduced power meant speed knots mph conversion existing superstructure razed new hangar deck built existing upper deck length meter flight deck added maximum width meters meter aircraft elevators serviced single hangar small starboard island structure ship improve stability increased beam maximum meters waterline trials displacement increased metric tons long tons additional weight increased draft meters initially ship light armament triple millimeter gun mounts controlled type fire control directors modified substitute caliber type dual purpose guns mounted twin gun turrets tube launchers centimeter anti aircraft rockets triple millimeter gun mounts directors type gave ship total guns triple mounts type gun fired millimeter kilogram muzzle velocity gave maximum range meters maximum ceiling meters entire turret weighed kilograms guns fire rate rounds minute island planned meter rangefinder type radar type radar moved retractable mount flight deck near bow type surface search type air search radar going installed island ship retained type system ship air group designed consist aircraft allied sam fighters dozen grace dive torpedo bombers construction ordered rapid naval armaments supplement programme laid naval arsenal april construction suspended june construction resumed month later allow ship launched clear carrier construction named april naming convention class cruisers ship launched construction suspended july decided navy considered completing high speed decided convert light aircraft carrier august plans prepared conversion towed submarine tender december completion ship originally scheduled march rescheduled august delays work continued march ordered halt complete concentrate construction small submarines needed defend japan american invasion anchored near surrendered september rest japanese military scrapped november august
Japanese cruiser Ibuki (1943)