BL_6_inch_Mk_XII_naval_gun

BL 6-inch Mk XII naval gun

BL 6-inch Mk XII naval gun

Naval gun

The BL 6-inch Mark XII naval gun[8] was a British 45 calibre naval gun which was mounted as primary armament on light cruisers and secondary armament on dreadnought battleships commissioned in the period 1914–1926, and remained in service on many warships until the end of World War II.

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Design

This was a high-velocity naval gun consisting of inner "A" tube, "A" tube, wound with successive layers of steel wire, with a jacket over the wire.[9]

Single gun on CP mounting on cruiser HMS Enterprise
Experimental twin turret on HMS Enterprise, seen in 1936, which formed the prototype for twin 6-inch turrets for the Nelson-class battleships, as well as the Leander and Arethusa-class cruisers
Gunners load a casemate gun on battleship HMS Malaya, May 1943. The men at left carry cordite cartridges, still in their storage cases, on their shoulders

It superseded the 45-calibre Mk VII gun and the longer 50-calibre Mk XI gun which had proved unwieldy in light cruisers due to its length, and was Britain's most modern 6-inch naval gun when World War I began.

It was superseded as secondary armament on new battleships in the 1920s by the 50-calibre 6-inch Mk XXII gun, and as main armament on new light cruisers in the 1930s by the 50-calibre 6-inch Mk XXIII gun.

Guns were mounted in the following ships :

Coast defence gun

During WWII some Mk XII guns were used in emergency coast defense batteries.[10]

Notable actions

Ammunition

This gun generated a higher pressure in the chamber on firing compared to preceding 6-inch guns such as Mk VII and Mk XI. This necessitated use of special shells capable of withstanding a pressure of 20 tons per square inch on firing, which had "Q" suffixed to the name. World War I shells were marked "A.Q." denoting special 4 CRH shells for this gun.[1]

See also

Weapons of comparable role, performance and era

Surviving examples

Notes and references

  1. [1]
    Handbook, 1917, Page 5
  2. [2]
    Handbook, 1917, Page 7
  3. [3]
    100 lb shells: Treatise on Ammunition, 1915
  4. [4]
    Handbook, 1917, Page 6, 23-26
  5. [5]
    30° elevation was possible with P.XIII mountings used on light cruisers; 20° elevation was possible on some P.VII* mountings used on light cruisers; 14° elevation was possible with P.IX mountings used on battleships; 15° was possible with P.VII mountings used on light cruisers. Handbook, 1917, Pages 5, 31, 41, Plates 6, 24, 35
  6. [6]
    2,825 feet per second using 27 lb 2 oz cordite MD size 19 propellant was the figure used in range tables. New guns were quoted with a muzzle velocity of 2,845 feet per second. Handbook, 1917, Page 5
  7. [7]
    "Gun Model: BR 6in 45cal BL Mk XII". navalhistory. Retrieved 6 September 2014.
  8. [8]
    Mark XII = Mark 12 : Britain denoted Marks (models) of guns with Roman numerals until after World War II. This was the twelfth model of British BL 6-inch gun.
  9. [9]
    Handbook, 1917, page 5, 6
  10. [10]
    "Britain 6"/45 (15.2 cm) BL Mark XII and Mark XX". navweapons.com. Retrieved 6 September 2014.

Bibliography

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