Key Points and Summary - Japan’s Design A-150 “Super Yamato” was meant to be the ultimate battleship: up to 70,000–90,000 tons, six 510 mm guns, huge armor belts, and 30-knot speed to crush any U.S.

The Japanese Yamato-class battleships were the most significant vessels ever to steam the high seas. They were gargantuan dreadnoughts. Japan even had a plan to build a more enormous battleship – the ...