5"/51 caliber gun

5"/51 caliber gun

5"/51 caliber guns (spoken "five-inch-fifty-one-caliber") formed the secondary batteries of United States Navy battleships built from 1907 through the 1920s. United States naval gun terminology indicates the gun fired a projectile 5 inches (127 mm) in diameter, and the barrel was 51 calibers long. (barrel length is 5" × 51 = 255" or 6.4 meters.) [Fairfield 1921 p. 156]

The gun weighed about 5 tonnes and used a 24.5-pound (11 kg) charge of nitrocellulose propellant to give a 50-pound (23 kg) projectile a velocity of 3,150 feet per second (960 m/s). Range was 9 miles (15 km) at the maximum elevation of 20 degrees. [Campbell 1985 p.136] Increased awareness of the need for anti-aircraft protection encouraged mounting of dual-purpose 5"/38 caliber guns in later battleships and most of the older battleships were rearmed. Surplus guns from scrapped or re-armed battleships were mounted in United States Coast Guard cutters, auxiliaries, small aircraft carriers, coast defense batteries, and Defensively Equipped Merchant Ships. [Campbell 1985 p.136] 5"/51 shore batteries were used with great effectiveness by the Marines during the Battle of Wake Island in December 1941.

The 5"/51 caliber gun was mounted on:

Notes

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