A-150 Super Yamato-Class: Japan’s Plan for The Most Massive Battleship Ever: Also known as the Super Yamato-class, the Design A-150 battleship program began in late 1938. As conceived by its designers, the warship was to be armed with at least six 510mm (20-inch) guns as well as dozens of smaller caliber weapons. As originally envisioned the super battleship was to be 91,000 metric tons (90,000 long tons), and yet somehow was to be fast enough to maintain a speed of 30 knots – faster than the Am