1.1"/75 caliber gun
|1.1" / 75 Caliber Gun|
Quadruple-mount 1.1-inch (28 mm) anti-aircraft cannon aboard the battleship USS Pennsylvania (BB 38) during World War II
|Type||Anti-aircraft Naval Gun|
|Place of origin||United States|
|Used by||US Navy|
|Wars||World War II|
|Weight||10,500 pounds (4,800 kg)|
|Length||119.6 inches (3.04 m)|
|Barrel length||82.5 inches (2.10 m) bore (75 calibres)|
|Caliber||1.1-inch (28 mm)|
|Recoil||3.25-inch (83 mm)|
|Elevation||-15 to 110 degrees|
|Rate of fire||150 rpm|
|Muzzle velocity||2,700 feet per second (820 m/s)|
|Maximum range||6,300 yards (5,800 m)|
The 1.1"/75 caliber gun was an American anti-aircraft weapon of World War II. The name means that it had a bore diameter of 1.1 inches (28 mm) and barrel length of 75 × 1.1 inches = 82.5 inches (2.1 m), using the "caliber" nomenclature common to large artillery pieces.
During the early part of the World War II, they were deployed on most U.S. Navy warships of destroyer and larger size.
Due to teething problems that were never rectified, the gun was very unpopular with its crews. It was replaced with the Bofors 40 mm gun whenever possible, but served until the end of the war on some ships.
The guns were sometimes referred to as "Chicago Pianos."
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