6 inch (15.2 cm) /47 Mark 16 guns
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6 inch (15.2 cm) /47 Mark 16 guns were used to arm the Brooklyn and Cleveland class light cruisers, the latter being the most numerous class of cruisers ever built. Developed from experiments with old 6"/50 (15.2 cm) Mark 8 guns with various modifications to test new ideas, this weapon was to a new design firing separate (semi-fixed) ammunition and was capable of using the "super heavy" AP projectile.[1] These new projectiles had almost double the penetration performance when compared against the older 6"/53 (15.2 cm) AP projectiles used for the Omaha-class light cruisers. Each gun (called a "rifle" in the Navy) could hurl a 130-pound (59 kg) projectile 13 miles (21 km) against both surface and shore targets. Maximum range at 41 degrees elevation was 14.5 miles (23.3 km). Projectiles varied in weight. An armor-piercing projectile weighed 130 pounds, a high capacity projectile weighed 105 pounds, and an anti-aircraft projectile weighed 65 pounds. Ammunition was semi-fixed (the projectile and the powder casing were separate). The powder case for these guns was housed in a brass canister and weighed 65 pounds (29 kg).
Eight to ten rounds per minute could be fired from each of the 6-inch guns.[2] Each gun weighed 4.31 tons and could be elevated up to 60 degrees. A round from one of these guns could pierce up to 5 in (127 mm) of hardened armor plate.
Constructed of monobloc autofretted barrel with liner secured to the housing by a bayonet joint. Mark 16 Mod 1 differed from Mod 0 in having a tapered liner. All used a semi-automatic vertical sliding breech block accommodated in the housing.[1] There was a 0.5 in (12.7 mm) ring attachment at the muzzle.
The Brooklyn and her class were the first ships to mount this weapon. It was also mounted on the St. Louis, Fargo and Cleveland class cruisers. In all of these ships it was mounted in the Mark 16/1 triple turret.
References