QF 4 inch naval gun Mk IV, XII, XXII

Ordnance QF 4 inch gun Mk IV, XII, XXII

Mk IV gun from HMS Lance 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 firing range 10,000 yards (9,100 m)

The QF 4-inch gun Mk IV[note 1] 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 XII and Mk XXII variants armed many British interwar and World War II submarines.

Mk IV gun

On R-class destroyer HMS Satyr circa. 1917 - 1918
Gun recoiling after firing, on Australian auxiliary anti-submarine vessel HMAS Wilcannia ca. 1943

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 :

Mk XII and XXII submarine gun

Mk XII gun on unidentified T-class submarine circa. World War II

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guns fired a heavier 35-pound projectile from late 1944.[1] Shortly after the end of hostilities, the Mk XXII was superseded in new British submarines by the lighter QF 4 inch Mk XXIII.[3]

Mk XII and XXII equipped submarines

Surviving guns

See also

Weapons of comparable role, performance and era

Notes

  1. Mk IV = Mark 4. Britain used Roman numerals to denote Marks (models) of ordnance until after World War II. This was the fourth model of 4-inch QF naval gun. Variants Mk XII = Mark 12, Mk XXII = Mark 22.

References

  1. 1 2 DiGiulian
  2. 2,370 ft/s for Mk IV gun with 31 lb (14 kg) projectile in WWI, using 5 lb 1 oz 12 drams cordite MD size 16 propellant (Treatise on Ammunition, 10th Edition 1915)
  3. "Britain - 4"/33 (10.2 cm) QF Mark XXIII". www.navweaps.com. Tony DiGiulian. 22 October 2008. Retrieved 21 March 2014.

Bibliography

External links

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