The Prancing Dragon: How a Treaty Loophole Created Japan's Most Unstable Aircraft Carrier

Wars & Conflicts · Published 15 October 2026 Swipe more like this →

In short: Designed to exploit a naval treaty loophole, the light carrier Ryūjō was so top-heavy she nearly capsized during routine maneuvers. Despite her precarious engineering, this Prancing Dragon served as a frontline flagship across the Pacific, eventually meeting her end in the Battle of the Eastern Solomons during World War II.

The Ryūjō was conceived in the late 1920s to circumvent the Washington Naval Treaty of 1922, which restricted aircraft carriers over 10,000 tons. By keeping her displacement at 8,000 metric tons, the Imperial Japanese Navy hoped to bypass these international limitations. However, the design was fundamentally flawed. To accommodate a doubled aircraft capacity of 48 planes, engineers added a second hangar atop the first, which, combined with a narrow beam and lack of armor, rendered the ship dangerously top-heavy. Her stability issues were so severe that the navy had to implement emergency modifications following the 1934 Tomozuru Incident, where a similarly top-heavy torpedo boat capsized in heavy seas.

The ship's operational history was marked by constant technical struggles. Her small rear elevator was incompatible with most modern carrier aircraft by 1941, effectively forcing the crew to operate her as a single-elevator ship, which severely hampered combat efficiency. Furthermore, her anti-aircraft defenses, particularly the 25mm Type 96 guns, were criticized by historians as ineffective due to slow training speeds and excessive vibration. Despite these shortcomings, the Ryūjō participated in major campaigns, including the invasion of the Philippines, the Indian Ocean raid, and the opening of the Aleutian Islands campaign at Dutch Harbor in June 1942.

Her final engagement occurred on 24 August 1942, during the Battle of the Eastern Solomons. Tasked with attacking Henderson Field on Guadalcanal, the carrier was spotted by American search aircraft. A strike force from the USS Saratoga successfully hit the Ryūjō with three 1,000-pound bombs and one torpedo. The resulting flooding in her engine and boiler rooms proved fatal. She capsized later that afternoon, taking 120 crew members with her. Her legacy remains a testament to the risks of treaty-circumventing naval architecture, where the drive for strategic advantage often compromised the basic safety and functionality of the vessel.

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