The General Staff specification drew on the experience of Centurion tanks in the Korean War as well as that of the Conqueror tank. Leyland, who had been involved in the Centurion tank had built their own prototypes of a new tank design in 1956 and these led to a War Office specification for a new tank. A single design combining the firepower of the Conqueror's 120 mm gun with the mobility and general usefulness of the Centurion was seen as the ideal combination. However, the introduction of the Soviet IS-3 heavy tank along with Soviet T-54/T-55 forced the introduction of their own Conqueror heavy tank armed with a 120 mm (4.7 in) gun. Its predecessor the Centurion main battle tank is widely considered to be one of the most successful of post-war MBT designs. Heavily damaged during the Battle of Midway it was sunk by the destroyer Hagikaze.The Chieftain was an evolutionary development of the successful cruiser line of tanks that had emerged at the end of the Second World War. Completed as a carrier she participated in all major Japanese combat operations conducted during 1930 – 1942. The repair was deemed pointless so it was decided to convert the battleship Kaga, work on which was on similar stage of advance, to a carrier in lieu of the destroyed Amagi. Another chance emerged after the earthquake which affected the Kanto region on 1 September 1923 and heavily damaged the hull of the battlecruiser Amagi. Kaga was laid down on 19 July 1920 in the Kawasaki shipyard in Kobe and the complete hull was launched on 17 November 1921 and the construction was canceled a month later! The future of the ship was definitely endangered by the Washington Naval Treaty, which notabene stipulated the conversion of Kaga to a target ship.
They had substantial contribution in development of the final design, which was completed in mid 1918 and its author was the designer Captain Yozuru Hiraga. Individual solutions envisaged in the design were duly analyzed, and pieces of information systematically arriving from Europe, where the world war was raging, proved helpful in their verification. The first studies on the preliminary design began in 1917 and during the calendar year several variants were developed.
The career of Kaga, which started on the drawing boards of the design bureau as a battleship had capacity for swift development.
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