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The 3-inch 20 cwt gun was superseded by the QF 3.7-inch (94 mm) AA gun from 1938 onwards, but numbers of various Marks remained in service throughout World War II.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.
The QF 3-inch 20 cwt anti-aircraft gun had been replaced by the 3.7-inch gun so these were selected and Vauxhall was provided with 100 guns and given the task of producing the vehicle. The design used a fixed square thick plate superstructure with the gun in a ball mount low in the front next to the driver.
During World War I, anti-aircraft guns and anti-aircraft gunnery developed rapidly. The British Army eventually adopted the QF 3-inch 20 cwt as the most commonly used type. Shortly before the end of the war, a new QF 3.6 inch gun was accepted for service but the end of the war meant it did not enter production.
QF 3 inch 20 cwt United Kingdom: World War I: 76.2 3"/23 caliber gun United States: World War I - 1920s 76.2 1 or 2 3"/50 caliber gun United States: World War I - World War II - Cold War: 76.2 2 3"/70 Mark 26 gun United States United Kingdom: Cold War: 100 2 10 cm/65 Type 98 naval gun Empire of Japan: World War II: 102 QF 4 inch Mk V naval gun ...
76.2 mm (3.00 in) QF 12 pounder 18 cwt naval gun United Kingdom: World War I 76.2 mm (3.00 in) QF 14 pounder Maxim-Nordenfelt naval gun United Kingdom: World War I 76.2 mm (3.00 in) QF 14 pounder naval gun Mk I & II naval gun United Kingdom: World War I 76.2 mm (3.00 in) QF 3-inch 20 cwt Mk I, Mk II, Mk III, Mk IV United Kingdom
The hundredweight (abbreviation: cwt), formerly also known as the centum weight or quintal, is a British imperial and United States customary unit of weight or mass. Its value differs between the United States customary and British imperial systems.
A 3-inch gun is a gun with a 3-inch bore. Examples include: 3-inch M1902 field gun also M1904, M1905; 3-inch gun M1903 - US coast defense gun, also M1898, M1902 seacoast gun; 3"/50 caliber gun - US dual purpose naval gun; 3"/23 caliber gun - US dual purpose naval gun; QF 3 inch 20 cwt - British anti-aircraft gun; 3-inch Gun M1918 - US anti ...
A pair of QF 3-inch 20 cwt [Note 1] anti-aircraft guns were fitted abreast the mainmast on Courageous. She mounted two submerged tubes for 21-inch torpedoes and carried 10 torpedoes for them. [ 5 ]