Overview and identity
IJN Akagi served with Imperial Japanese Navy as a member of Akagi.
IJN Akagi can be distinguished by membership in Akagi and service with Imperial Japanese Navy. Its history belongs to interwar period and World War II and to the broader development of naval aviation ships. Naval aviation ships shifted the striking power of a fleet from the hull's own guns to aircraft operated from the flight deck. Their effectiveness depended on more than size. Deck arrangement, hangar capacity, aviation support, speed, survivability, and the ability to work with escorts all shaped what the ship could contribute to a task force.
Construction and class context
IJN Akagi was built by Kure Naval Arsenal. The construction chronology records laid down 1920-12-06, launched 1925-04-22, and completed 1927-03-25. Construction dates help place the ship within its class program and distinguish the original build from later changes in name, classification, armament, or mission.
Large Japanese fleet carrier converted from an incomplete battlecruiser hull. Washington treaty restrictions ended completion as a battlecruiser and the hull was redesigned for carrier service. The class history explains the common design; this article concentrates on the evidence specific to IJN Akagi, including construction, assignments, modifications, transfers, and fate where documented.
Service history
Originally laid down as an Amagi-class battlecruiser and converted to an aircraft carrier under the Washington treaty settlement. Names and designations documented during the ship’s career include IJN Akagi (1920-12-06 - 1923 · Imperial Japanese Navy) and IJN Akagi (from 1923 · Imperial Japanese Navy).
As a member of Akagi, IJN Akagi began with the design, machinery, protection, and mission assumptions shared by the class. Those assumptions included carrier operations and fleet carrier operations. Ship-specific refits, damage repair, transfers, reclassification, and changing assignments could alter that baseline. Class-level information is therefore used as context, not as proof that every feature remained aboard throughout this ship's career.
Technical configuration
The Carrier conversion as completed (1927) configuration is presented as a class-level configuration used for context. Its listed characteristics include displacement 26,900 metric ton (standard), length 260.7 m, beam 29.0 m, and draft 8.07 m. The recorded armament is 200 mm guns and anti-aircraft battery. For IJN Akagi, it should be read as shared class context rather than proof of a ship-specific fit on every date.
Later service and disposition
IJN Akagi was sunk. The associated date is 1942-06-05. The recorded location is near Midway Atoll. Scuttled after battle damage.
The sources reviewed do not identify IJN Akagi as preserved. Its history must therefore be reconstructed through documents, photographs, technical records, and evidence connected to the class and operating navy.
Historical significance
IJN Akagi is significant as an individual example of how Akagi moved from a design program into operational service. Its value lies in connecting a specific vessel, its identities, and its known service outcome to the wider history of the class.
The evidence currently available for IJN Akagi is strongest on its construction chronology, its documented names and designations, its recorded service, and its final status. The article separates those ship-specific facts from the shared characteristics of Akagi, so readers can see both what is known about this vessel and where the historical record still needs stronger documentation.
Class relationship
This ship is recorded as a member of Akagi. Shared design history belongs on the class page; this page concentrates on the individual hull where evidence is available.
Sources and further reading
- Conway's All the World's Fighting Ships, 1922–1946Conway Maritime Press
- Treaty Between the United States of America, the British Empire, France, Italy, and Japan, Limiting Naval Armament ↗U.S. Department of State, Office of the Historian · accessed 2026-09-18
- AKAGI aircraft carrier (1927) ↗Navypedia · accessed 2026-09-18