The class was intended to be equipped with four Gijutsu-Hombu geared steam turbines, each of which drove one propeller shaft.

The normal displacement of the battleships was 47,500 metric tons (46,700 long tons). They had a beam of 30.8 meters (101 ft 1 in) and a draft of 9.8 meters (32 ft 2 in). The ships had a length of 259.1 meters (850 ft 1 in) between perpendiculars and 274.4 meters (900 ft 3 in) overall. The ships were based on his previous Kii-class battleship and Amagi-class battlecruiser designs, enlarged to take 457-millimeter (18 in) guns. The Number 13 class was designed by Captain Yuzuru Hiraga, the naval architect responsible for most of the previous Japanese capital ships. From an engineering aspect they were more than ten years ahead of their time because they anticipated the characteristics of the fully developed, fast battleship.' Naval architects William Garzke and Robert Dulin concur saying, 'These ships would have completely outclassed any European battleship'. Their gun calibre alone would have caused a new and more intensive naval arms race. In the words of naval historian Siegfried Breyer, 'had been completed, they would have been the world's largest and most powerful battleships. When designing the latter class, the Japanese followed the doctrine that they had used since the First Sino-Japanese War of 1894–1895 of compensating for quantitative inferiority with qualitative superiority. The Japanese response required the construction of eight additional fast battleships in the Kii and the Number 13 classes.

Despite this, the IJN gained approval of the 'eight-eight-eight' plan in 1920 after American President Woodrow Wilson announced plans in 1919 to re-initiate the 1916 plan for ten additional battleships and six battlecruisers. However, having four large battleships and four battlecruisers on order put an enormous financial strain on Japan, which was spending about a third of its national budget on the Navy. After the signing of the Washington Naval Treaty in 1922, they were cancelled in November 1923 before construction could begin.īy 1918, the Navy had gained approval for an 'eight-six' fleet, all ships under eight years old. The Number 13 class was designed to be superior to all other existing battleships, planned or building. They were intended to reinforce Japan's ' eight-eight fleet' of eight battleships and eight battlecruisers after the United States announced a major naval construction program in 1919. The ships never received any names, being known only as Numbers 13–16. The Number 13-class battleship was a planned class of four fast battleships to be built for the Imperial Japanese Navy (IJN) during the 1920s. Right elevation line drawing of the design for the Number 13 class

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