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A prototype development of the 3.7-inch gun using the QF 4.5-inch naval gun Mk V barrel with a liner to give a gun using a 4.45 inches (113 mm) size cartridge case to drive the 3.7 inches (94 mm) shell. The barrel wear proved excessive and it was dropped in favour of the Mk VI.
The 3-inch 20 cwt gun was superseded by the QF 3.7-inch (94 mm) AA gun from 1938 onwards, but numbers of various Marks remained in service throughout World War II. In Naval use it was being replaced in the 1920s by the QF 4-inch (100 mm) Mk V on HA (high-angle) mounting.
In British service, it was used with the 5.25 inch and QF 3.7 inch AA guns, as well as the Brakemine missile. Mk. 7 developed from experiments in the mid-WWII era on auto-follow radar systems on the GL Mk. III radar and Searchlight Control radar systems. Production was not taken up at that time due to the imminent arrival of the SCR-584. The ...
Similarly, the shorter L/43 calibre length – 1,720 mm (5 ft 8 in) – refers to the length of the barrel and breech mounted as a unit. [20] The actual barrel length is 1,570 mm (5 ft 2 in) – 39.25 calibres. [20] With a flash hider or muzzle brake mounted the barrel length becomes 1,740 mm (5 ft 9 in) [20] or 1,760 mm (5 ft 9 in). [21]
During 2022, SIG introduced a larger variant of the P365, branded as XMACRO, with a 17-round capacity and measuring 5.2 inches (13 cm) high and 6.6 inches (17 cm) long while maintaining a 3.1-inch (7.9 cm) barrel.
US dry barrel: 7,056 cubic inches (115.6 litres; 3.3 US bushels) . Defined as length of stave 28 + 1 ⁄ 2 in (72 cm), diameter of head 17 + 1 ⁄ 8 in (43 cm), distance between heads 26 in (66 cm), circumference of bulge 64 in (160 cm) outside measurement; representing as nearly as possible 7,056 cubic inches; and the thickness of staves not greater than 4 ⁄ 10 in (10 mm) [2] (diameter ≈ ...
The 4.7 inch calibre was superseded by the 4.5 inch calibre on the Z-class destroyers in 1943. The new 4.5 inch guns all had 55-degree elevation mounts and fired a shell slightly heavier than that of 4.7-inch Mk IX and XII guns, although slightly lighter than that fired by the 4.7 inch Mk XI gun.
The cradle itself was cylindrical, covering the whole of the rear half of the barrel. The weight of the powder charge fired is 95 percent of the weight of the projectile, which had an estimated velocity of approximately 1200 m/s (4,000 f/s), and a penetration of 15 cm (5.94 inches) of homogeneous armor at 900 m (1,000 yards).