High Quality Content by WIKIPEDIA articles! The Vickers Class "S" was a 40 mm (1.57 in) cannon used to arm British aircraft for attacking ground targets in the Second World War. The Vickers Class "S" 40 mm (1.57 in) gun was developed in the late 1930s as an aircraft weapon. The ammunition was based on the 40x158R cartridge case of the naval 2 pdr Anti-aircraft gun (the "Pom-pom"). The weapon was a long-recoil design derived from the 37 mm 1 1/2 pdr "COW gun" from Coventry Ordnance Works.The gun was originally intended as a bomber defensive weapon and was tested as such in a turret fitted to a modified Vickers Wellington II.

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