Dimensions: 706 x 87.5 x 26.5 feet/215 x 26.7 x 8 meters
Extreme Dimensions: 719.5 x ?? x 26.5 feet/219 x ?? x 8 meters
Propulsion: Steam turbines, 6 boilers, 2 shafts, 56,250 shp, 25.5 knots
Armor: 1 inch over machinery
Armament: 6 dual 5/40 DP, 24 25 mm AA
Concept/Program: Large liners built under the "Shadow Program" and intended for easy conversion to carriers. They were an intermediate type between heavy and light fleet carriers: as large as the heavies, but too slow for effective fleet operations. These vessels were classed as auxiliaries until 31 July 1942, when they were reclassified as warships.
Design/Conversion: Taken over prior to completion. Reworked from the main deck up with dual hangars (restricted in height to reduce topweight), full length flight deck, large island, bulged hull, etc. Sea speed was 22-23 knots and the low hangar clearances were a serious hindrance.
Modifications: Both received an additional 26 25 mm AA in 1943; Junyo carried up to 76 25 mm by 1944. Operational: Both saw varied service through 1944. Departure from Service/Disposal: Hiyo sunk 1944; Junyo rendered inoperable in 1944.