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QF 4 inch naval gun Mk IV, XII, XXII

 

QF 4 inch naval gun Mk IV, XII, XXII

Ordnance QF 4 inch gun Mk IV, XII, XXII
at the Imperial War Museum, London
Type Light Naval gun
Submarine gun
Place of origin United Kingdom
Service history
In service 1911-1940s
Used by  United Kingdom
Wars World War I
World War II
Specifications
Weight 2,750 pounds (1,250 kg) barrel & breech
Barrel length 160 inches (4.064 m) bore (40 calibres)

Shell Mk IV : Separate QF 31 pounds (14.06 kg);
Mk XII & XXII : Fixed QF 31 pounds (14.06 kg), 35 pounds (15.88 kg) from 1944[1]
Calibre 4-inch (101.6 mm)
Breech horizontal sliding block
Muzzle velocity Mk IV : 2,370 feet per second (720 m/s)[2]
Mk XII & XXII : 1,873 feet per second (571 m/s)
Maximum range 10,000 yards (9,100 m)

The QF 4-inch gun Mk IV[3] was introduced in 1911 as a faster-loading light gun successor to the BL 4 inch Mk VIII gun, and was the main gun on most Royal Navy and British Empire destroyers in World War I.

Mk IV gun


Mk IV armed many British destroyers and some cruisers in World War I. It was used to arm merchant ships in World War II.

The guns armed the following warships :

  • Forward class scout cruisers as re-gunned in 1911
  • Sentinel class scout cruisers as re-gunned 1911-1912
  • Pathfinder class scout cruisers as re-gunned 1911-1912
  • Adventure class scout cruisers as re-gunned 1911-1912
  • Acasta (K) class destroyers of 1911
  • Laforey (L) class destroyers of 1913
  • Yarrow M class destroyers laid down 1912 - 1915
  • Admiralty M class destroyer of 1913
  • Thornycroft M class destroyers laid down 1913 - 1915
  • Hawthorn M class destroyer of 1914
  • Talisman class destroyers of 1914
  • Medea class destroyers of 1914
  • Faulknor class leaders of 1914
  • Marksman class destroyers of 1914
  • Parker class leaders of 1915
  • Yarrow Later M class destroyers of 1915
  • R class destroyers of 1916
  • S class destroyers of 1917
  • Fundy class minesweepers of 1938 (guns from decommissioned Canadian S class destroyers)

Mk XII and XXII submarine gun

The Mk XII variant was developed for arming submarines from 1918, Mk XXII was developed to arm submarines during World War II. These submarine guns fired a heavier 35-pound projectile from late 1944.[1] Mk XII and XXII equipped :

  • L class
  • Odin ("O") class
  • Parthian ("P") class
  • River (or Thames) class
  • Grampus (or Porpoise) class
  • Triton ("T") class
  • S class
  • Some of the Amphion ("A" or Acheron) class

Surviving guns


See also

Weapons of comparable role, performance and era

  • 10.5 cm SK C/32 naval gun : Slightly more powerful German equivalent WWII submarine gun

Notes

References

  • Tony DiGiulian, British 4"/40 (10.2 cm) QF Marks IV, XII and XXII

External links

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