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| Ryūjō (aircraft carrier) | |
|---|---|
| Ship name | Ryūjō |
| Caption | IJN Ryūjō underway, date unknown |
| Builder | Kure Naval Arsenal |
| Launched | 1931 |
| Commissioned | 1933 |
| Fate | Sunk 1942 |
| Class | Ryūjō-class |
| Displacement | 8,000–11,000 tons (design/loaded) |
| Length | 180 m (overall) |
| Beam | 23 m |
| Draft | 7.5 m |
| Propulsion | Steam turbines |
| Speed | 28–29 knots |
| Complement | ~720 officers and men |
| Aircraft | 24–48 (varied) |
Ryūjō (aircraft carrier) was a light aircraft carrier of the Imperial Japanese Navy commissioned in 1933, notable for her controversial design and service during the Second Sino-Japanese War and the Pacific War. She embodied interwar Japanese naval policy shaped by the Washington Naval Treaty, London Naval Treaty (1930), and the strategic debates between proponents of big-gun battleship concepts and naval aviation advocates such as Isoroku Yamamoto and Kantarō Suzuki. Ryūjō's short career intersected with events including the Second Sino-Japanese War, the Second World War, the Battle of the Coral Sea, and the Guadalcanal campaign.
Ryūjō was ordered amid tensions following the London Naval Treaty (1930) and designed by engineers at Kure Naval Arsenal employing lessons from carriers like Hōshō, Akagi, Kaga, and Hiryū. Her construction reflected attempts to maximize aircraft carrier capability within treaty tonnage limits negotiated at Washington Naval Conference (1921–22) and London Naval Conference (1930). Naval planners including officers from the Imperial Japanese Navy General Staff and the Navy Technical Department debated displacement, armor, and aviation capacity while referencing foreign designs such as HMS Furious, USS Langley, and Aquila (aircraft carrier). The resulting hull prioritized speed and a long flight deck but sacrificed armor and stability, mirroring controversies seen with Graf Zeppelin planning and discussions among proponents like Prince Fushimi Hiroyasu and critics within the Combined Fleet.
Ryūjō's machinery featured geared steam turbines and multiple boilers derived from designs used on Myōkō-class cruiser escorts and newer Yamato-class battleship preliminary studies. Her designed displacement was nominally within the treaty limits, though full-load displacement approached figures comparable to Soryu-class aircraft carrier contemporaries. Armament included medium-caliber anti-aircraft guns similar to weapons employed on Sendai-class cruiser escorts and light AA machine guns patterned after Type 96 25 mm AA gun installations. Aviation facilities comprised a single wooden flight deck, an island superstructure influenced by Hōshō and Sōryū experiments, hangar elevators of dimensions comparable to Akagi's amidships lifts, and aviation fuel storage arrangements reflecting practices from Imperial Japanese Navy Air Service carriers. Her stability margins were reduced by reduced beam and minimal armor belt compared to Kaga and Akagi.
Upon commissioning Ryūjō served with units operating from Kure and Yokosuka and participated in Second Sino-Japanese War operations supporting Shanghai and Nanjing campaigns alongside cruisers such as Chikuma and Kako. During the prelude to Pacific War operations she conducted training exercises with Carrier Division 4 units and air groups influenced by tactics developed by aviators like Mitsuo Fuchida and staff officers from Tsuchihashi planning sections. In early 1942 Ryūjō supported invasions in Southeast Asia and the Netherlands East Indies campaign, operating in concert with fleet units including Shōkaku, Zuikaku, Shōhō, and Akagi. She later participated in the Guadalcanal campaign logistic efforts and was present during operations around Rabaul, Truk, and Rendova before her loss.
Ryūjō embarked aircrews drawn from the Imperial Japanese Navy Air Service and flew types used across the fleet such as the A6M Zero, B5N Kate, D1A dive bomber, Aichi D3A Val, Nakajima B5N torpedo bombers, and reconnaissance seaplanes like the Mitsubishi F1M. Her air group composition fluctuated with mission requirements, at times deploying fighter, dive-bomber, and torpedo-bomber elements akin to complements aboard Hiryū and Sōryū. Notable aircrew transfers involved pilots who later served on carriers such as Zuikaku and Shōkaku and officers connected with aviators like Saburo Sakai and Tetsuzo Iwamoto through training schools at Kasumigaura and Kōkūtai commands. Ryūjō's operational tempo and aircraft maintenance were affected by hangar size and elevator performance comparable to contemporaries like Ryuho and Chitose.
Throughout her career Ryūjō underwent stability-improving modifications and armament upgrades, reflecting lessons learned from incidents including the Tomozuru Incident and tactical analyses by the Naval Technical Bureau. Refits at Kure Naval Arsenal and Sasebo Naval Arsenal included additional ballast, enlarged bulges akin to refits on Tone-class cruiser conversions, increased anti-aircraft installations with more Type 96 25 mm AA gun mounts, and reinforcement of flight deck fittings based on experiences from Pearl Harbor raids and carrier operations with Shōkaku and Zuikaku. Plans considered for greater protection mirrored discussions surrounding Hiyō-class carrier conversions and prewar modernization debates involving figures from the Ministry of the Navy.
Ryūjō was sunk in February 1942 during operations in the Solomon Islands or Rennell Island vicinity after sustained air and submarine attacks involving forces from the United States Navy, notably units operating Douglas SBD Dauntless and Torpedo Squadron elements, and surface engagements connected to operations around Guadalcanal and Coral Sea. Her loss prompted inquiries within the Imperial Japanese Navy General Staff and influenced carrier construction priorities later seen in Shōkaku-class and Unryū-class programs. Survivors were reassigned to carriers and shore bases such as Rabaul, Truk Lagoon, and Yokosuka Naval District, while analyses of Ryūjō's design shortcomings fed into postwar assessments by naval historians including specialists referencing archives from National Institute for Defense Studies (Japan) and Western historians associated with Naval War College studies. Ryūjō's career remains a case study in interwar naval treaty effects, carrier design trade-offs, and the operational evolution of carrier aviation during the Pacific War.
Category:Aircraft carriers of the Imperial Japanese Navy Category:Shipwrecks in the Pacific Ocean