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During World War II the PL Locks and AC Slide Boxes (a component separate to the gun attached to the bottom and face of the breech block using a rifle-calibre tube insert to initiate firing of the bagged charge) utilising 0.5 inch (12.7 mm) tubes were replaced by PK Locks and Y Slide Boxes using 0.303 inch (7.7 mm) tubes. [5]
The 5.5 inch guns were removed from HMS Hood in the 1935 refit. In 1940 two were installed in Fort Bedford Battery on Ascension Island and remain there today. A pair were installed in specially built casemates on the roof of Coalhouse Fort in Essex, overlooking the Thames. [4]
The BL 7.5-inch Mk II–Mk V guns [note 1] were a variety of 50-calibre naval guns used by Britain in World War I. They all had similar performance and fired the same shells. They all had similar performance and fired the same shells.
I of 1905 and Mk. II of 1918 (two different designs) had become obsolete, and their barrels had mostly reached the end of their usable service life. A successor was sought and work began on an all-new design that would result in the Ordnance BL 4.5 inch medium field gun, a long-range medium gun designed for counter-battery fire.
During the Angolan Bush War, the South African Defence Force found itself at a disadvantage when facing opponents equipped with long-range Soviet Katyusha rocket launchers, which outranged South Africa's World War II-era 5.5-inch (140 mm) howitzers by a considerable margin. [3]
The 5.25-inch gun was carried in Mk I twin mountings by the King George V class and in Mk II twin mountings on nine of the first eleven Dido-class anti-aircraft cruisers, the exceptions being HMS Scylla and HMS Charybdis, which mounted QF 4.5-inch Mk III guns due to shortages of the 5.25-inch gun.
From the BL Mark I gun of 1916 the 4.7-inch (120 mm) calibre was the mid-calibre weapon of the Royal Navy, used particularly on destroyers.Apart from some ships armed with QF 4-inch Mk V guns due to shortages, it remained the standard weapon for destroyers up to the W-class destroyers of 1943.
Trials were held with some new boats, a fiberglass Shillalah II and the Soling plus a Dragon and 5.5 Metre for speed reference. After the trials the Soling alone was recommended to the IYRU. This passed through IYRY unanimously in November and the Soling became an International class. In 1974 Shillalah II also got the International class status.
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