Design A-150, popularly known as the Super Yamato-class battleship, was a planned class of ultra-massive warships designed by the Imperial Japanese Navy (IJN) to succeed the colossal Yamato-class. Conceived in late 1938 and almost fully designed by 1941, the project was completely halted after the outbreak of the Pacific War to prioritize aircraft carriers and smaller escort vessels. Because the Japanese destroyed nearly all official blueprints and technical documents at the end of World War II, many exact specifications remain a mystery, but surviving details reveal a terrifying engineering vision. The “Qualitative Superiority” Strategy
The foundational doctrine behind Design A-150 was qualitative superiority. Knowing that the United States possessed an industrial capacity that could out-build Japan three-to-one, the Japanese Navy decided that their individual ships had to be vastly more powerful than anything the U.S. could construct.
Furthermore, Japan knew the U.S. was limited by the Panama Canal, which capped the beam width and overall size of American warships. By building ships too wide to fit through the canal, Japan intended to maintain a permanent advantage in size, armor, and firepower. Unprecedented Firepower
The defining characteristic of the Super Yamato was its proposed main battery:
The 510 mm (20.1-inch) Guns: The ship was designed to carry six 510 mm guns configured in three twin turrets (two forward, one aft). These would have been the largest guns ever mounted on a warship, firing armor-piercing shells weighing over 4,000 pounds.
Secondary Armament: To avoid the anti-aircraft vulnerabilities that ultimately doomed the Yamato, the A-150 was designed with an extensive array of 100 mm (3.9-inch) dual-purpose guns. These high-velocity guns were highly regarded for their rapid fire and effectiveness against both aircraft and surface targets. Massive Armor and Dimensions
To protect against enemy shells of equivalent caliber, the armor configuration for Design A-150 was unprecedented:
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