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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.)[1]

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.[2]

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.[3]

The 5"/51 caliber gun was mounted on:

Notes

  1. ^ Fairfield 1921 p. 156
  2. ^ Campbell 1985 p.136
  3. ^ Campbell 1985 p.136
  4. ^ a b Breyer 1973 p. 189
  5. ^ a b Breyer 1973 p. 201
  6. ^ a b Breyer 1973 p. 202
  7. ^ a b Breyer 1973 p. 205
  8. ^ a b Breyer 1973 p. 210
  9. ^ a b Breyer 1973 p. 214
  10. ^ a b c Breyer 1973 p. 219
  11. ^ a b Breyer 1973 p. 226
  12. ^ a b c Breyer 1973 p. 230
  13. ^ Fahey 1939 p. 7
  14. ^ Friedman 1983 p. 162
  15. ^ a b c d e f g h i j k Friedman 1983 p. 170
  16. ^ a b c d Friedman 1983 p. 407
  17. ^ Friedman 1983 p. 164
  18. ^ a b c d Fahey 1941 p. 42

References

  • Breyer, Siegfried (1973). Battleships and Battle Cruisers 1905–1970. Doubleday and Company. ISBN 0385-0-7247-0. 
  • Campbell, John (1985). Naval Weapons of World War Two. Naval Institute Press. ISBN 0-87021-459-4. 
  • Fahey, James C. (1939). The Ships and Aircraft of the U.S. Fleet. Ships and Aircraft. 
  • Fahey, James C. (1941). The Ships and Aircraft of the U.S. Fleet, Two-Ocean Fleet Edition. Ships and Aircraft. 
  • Fairfield, A.P. (1921). Naval Ordnance. The Lord Baltimore Press. 
  • Friedman, Norman (1983). U.S. Aircraft Carriers. Naval Institute Press. ISBN 0-87021-739-9. 
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