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The BL 13.5 inch Mk V gun [note 2] was a British heavy naval gun, introduced in 1912 as the main armament for the new super-dreadnought battleships of the Orion class.The calibre was 13.5 inches (343 mm) and the barrels were 45 calibres long at 607.5 inches (15.43 m).
The BL 13.5 inch naval gun Mk I ("67-ton gun") was Britain's first successful large breechloading naval gun, initially designed in the early 1880s and eventually deployed in the late 1880s. Mks I - IV [ note 1 ] were all of 30 calibres length and of similar construction and performance.
The BL 13.5-inch Mk VI gun was a British heavy naval gun, originally ordered by the Ottoman Navy to equip its Reşadiye-class dreadnoughts around 1911. The one ship completed was seized by the British Government when World War I began in August 1914 and became HMS Erin .
BL 6 inch Mk XI naval gun 50-caliber United Kingdom: World War I - World War II 152.4 mm (6.00 in) BL 6 inch Mk XII naval gun 45-caliber United Kingdom: World War I - World War II 152.4 mm (6.00 in) BL 6 inch naval guns Mk XIII – XVIII United Kingdom: World War I - World War II 152.4 mm (6.00 in) BL 6 inch Mk XXII naval gun 50-caliber
The BL 15-inch Mark I succeeded the BL 13.5-inch Mk V naval gun.It was the first British 15-inch (380 mm) gun design and the most widely used and longest lasting of any British designs, and arguably the most successful heavy gun ever developed by the Royal Navy. [3]
The gun also saw service in the British Royal Navy, where it was designated BL 14-inch gun Mk II. History. The design of the 14-inch/45-caliber dates to about 1910.
The Mk XII derived from it suffered from the same problems. Instead of attempting to improve their 12-inch gun, the British developed the 13.5-inch Mk V gun of 45-calibres, which could achieve greater range at lower muzzle velocities due to its larger shell. Mk XI guns were mounted on: St. Vincent-class battleships laid down 1907, commissioned 1910
The BL 6-inch gun Marks II, III, IV and VI [note 1] were the second and subsequent generations of British 6-inch rifled breechloading naval guns, designed by the Royal Gun Factory in the 1880s following the first 6-inch breechloader, the relatively unsuccessful BL 6-inch 80-pounder gun designed by Elswick Ordnance.