The Battleship USS Massachusetts

The treaty battleship USS Massachusetts saw very intensive service with the US Navy from the moment she was commissioned in 1942 until the final days of World War II. One of her most famous actions was the victorious fight against the French battleship Jean Bart at Casablanca – one of the last face-offs of great ships of the line in naval history.

After she had deployed to the Pacific, the USS Massachusetts became a true workhorse of the fleet, taking part in dozens of operations with the US Navy aircraft carriers and lending her guns in support of numerous amphibious assaults. Today the USS Massachusetts is a museum ship moored at Fall River in her namesake state where she can be seen in her full glory.
The USS Massachusetts (BB-59) was a battleship of the second South Dakota class. The six vessels of the first class were designed in the 1920s, but later canceled under the terms of the Washington Naval Treaty, which imposed limitations on the tonnage of capital warships. The battleship was also the seventh US Navy warship to be named in honor of the U.S. sixth state.
In 1936 some of the Treaty limitations were lifted, which led to the expansion of the U.S. shipbuilding program. The design work on the new battleships began in the early 1930s, but the construction of the first two warships (the North Carolina class) was not formally authorized until 1937. In 1936, while working on the US Navy shipbuilding program for 1938, Admiral William H. Stanley, Chief of Naval Operations, endorsed the idea of the design and construction of a new class of battleships. By doing so Stanley went against the members of General Board, who favored the unification of the fleet’s capital assets through the continuation of development of the previous North Carolina class vessels. In the end the start of construction of the new warships was pushed to 1939. The initial development work on the new class of battleships began in March 1937 and by June 23 the design of the first two battleships was approved by the Secretary of the Navy. On April 4, 1938 the construction of both ships was formally authorized. The rising tensions in Europe and Asia led the U.S. Congress to authorize in June 1938 the construction of two additional warships of the new class. Thus started the construction of the four battleships which would later come to be known as the South Dakota class. In keeping with the US Navy tradition, the new battleships would be named after U.S. states: South Dakota, Indiana, Massachusetts and Alabama.

Stern of the ship with 2 catapults and OS2U Kingfisher floatplanes. Below the port side aircraft’s wing, a boat boom can be seen fitted to ship’s hull. [Visualization 3D Stefan Dramiński]

 

The design
The South Dakota  class battleships were designed as improved versions of the North Carolina class (both were built in keeping with the Washington Treaty requirements). The only major difference was the new ships’ main armament: the South Dakota class vessels were designed from the outset to carry 16 inch main guns. This required the installation of much stronger armor, capable of protecting the ship’s vital areas in confrontation with the enemy’s own 16 inch guns. If the new ship was going to comply with the Treaty tonnage limitation, the extra weight of armor had to be offset by weight reductions in other areas. This led to a significant reduction of the length of the ship’s armored citadel. Compared to the North Carolina  class, the South Dakota class battleships were much shorter and featured a much more compact, single-stack design. The stern section of the hull had larger beam to accommodate the propulsion system capable of accelerating the warship to her design speed of 27 knots. A number of technological improvements introduced in the new design resulted in more savings in weight. The new ships’ Achilles heel was their rather poor anti-torpedo protection. Luckily, that weakness was never exposed as none of the South Dakota class vessels came under successful torpedo attack during the war.
As has been mentioned before, the South Dakota  class battleships mounted nine reliable 16’’/45 Mark 6 main guns in three triple turrets (two forward super-firing turrets and a single aft turret). With the barrel raised to the maximum 45° of elevation, the gun could fire 1 225 kg armor-piercing projectiles at ranges of up to 33 700 m with the initial muzzle velocity of 700 m/s. The ship’s secondary battery consisted of twenty excellent 5”/38 Mark 12 guns mounted in ten twin turrets clustered amidships, along each side of the hull. The battleship’s armament was complemented by standard US Navy AA cannons – 40 mm Bofors and 20 mm Oerlikons. Initially (in 1942) there were six quadruple 40 mm mounts and 35 20 mm cannons, but with the increasing threat of air attacks more guns were added. By 1944 the ship sported 18 quadruple 40 mm mounts and 33 20 mm cannons. The numbers of AA guns mounted on the ship’s decks finally dropped in 1945 to 15 quadruple 40 mm stations and 31 20 mm cannons.
The development and application of radar technology was one of the priorities for the US Navy. By 1945 the battleship carried a wide array of various types of surveillance and fire control radar devices, which were good enough to allow for BVR engagements. The ship’s tactical reach was further extended by a pair of OS2U Kingfisher float planes launched from catapults mounted in the stern section.