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A 13.5/8-inch hypervelocity gun (a type of very large-calibre artillery) for stratospheric experiments was developed and deployed near St Margaret's in Kent. The weapon was a 13.5 inch gun Mark V lined down to 8 inches; the liner projected several feet beyond the 13.5 inch barrel.
The three 13.5 inch rail guns went to Dover for channel duties, and the 18 inch rail howitzer joined the 9.2 inch rail guns and 12 inch rail howitzers on inshore railways as part of the super heavy brigades' home defence intended to bombard landing grounds should a German seaborne invasion take place. [6]
The increase in weight of the 13.5 in guns, their mountings and ammunition increased draught from 26 feet 4 + 1 ⁄ 2 inches (8.039 m) to 27 feet 10 inches (8.48 m), and increased displacement by 800 long tons (810 t). [5] The Anson and Camperdown were laid down later, to greater dimensions.
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 14-inch/45-caliber gun, (spoken "fourteen-inch-forty-five-caliber" [citation needed]), whose variations were known initially as the Mark 1, 2, 3, and 5, and, when upgraded in the 1930s, were redesignated as the Mark 8, 9, 10, and 12. They were the first 14-inch (356 mm) guns to be employed by the United States Navy.
The adoption of this gun was influenced by the slow rate of production of the preferred new 13.5-inch (343 mm) guns: the Royal Navy had the option of delaying the completion of the new Admiral-class ironclads until sufficient 13.5-inch guns were available to equip them with four guns in two twin barbettes as planned; to use 12-inch (305 mm ...
7.5-inch howitzer used on HMS Vindictive during the Zeebrugge Raid. The weapon was developed together with other similar devices early in 1917 and went into service in June 1917 in response to German unrestricted submarine warfare. It was mounted on merchant ships and patrol vessels. By 10 December that year, 377 were in service. [3]
In an effort to increase the armour-piercing capability and range of a 12-inch gun, the 50 calibres/600 inches Mk XI's barrel was 5 calibres/60 inches longer than the previous Mk X gun's 45 calibres. As a result, muzzle velocity increased from 2,700 feet per second (820 m/s) to 2,825 feet per second (861 m/s), but bore erosion, which led to ...