QF 4-inch naval gun Mk IV, XII, XXII

Last updated
Ordnance QF 4 inch gun Mk IV, XII, XXII
QF 4 inch gun HMS Lance South Kensington 1926 IWM Q 45231.jpg
Mk IV gun from HMS Lance at Imperial War Museum Naval Gallery in South Kensington, London 1926
TypeLight Naval gun
Submarine gun
Place of originUnited Kingdom
Service history
In service1911-1940s
Used byUnited Kingdom
Wars World War I
World War II
Production history
No. built1,141 [1]
Specifications
Mass2,750 pounds (1,250 kg) barrel & breech
Barrel  length160 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 [2]
Calibre 4-inch (101.6 mm)
Breech horizontal sliding-block
Elevation PIX Mount -10° to +20°
CPIII Mount -10° to +30° [1]
Muzzle velocity Mk IV : 2,370 feet per second (720 m/s) [3]
Mk XII & XXII : 1,873 feet per second (571 m/s)
Maximum firing range11,580 yards (10,590 m) at +30° [1]

The QF 4-inch gun Mk IV [note 1] was the main gun on most Royal Navy and British Empire destroyers in World War I. It was introduced in 1911 as a faster-loading light gun successor to the BL 4 inch Mk VIII gun. Of the 1,141 produced, 939 were still available in 1939. [1] Mk XII and Mk XXII variants armed many British interwar and World War II submarines.

Contents

Mk IV gun

On R-class destroyer HMS Satyr c. 1917-1918 QF 4 inch Mk IV gun HMS Satyr WWI IWM SP 1497.jpg
On R-class destroyer HMS Satyrc.1917–1918
Gun recoiling after firing, on Australian auxiliary anti-submarine vessel HMAS Wilcannia c. 1943 QF 4 inch Mk IV gun recoiling on HMAS Wilcannia AWM 304887.jpeg
Gun recoiling after firing, on Australian auxiliary anti-submarine vessel HMAS Wilcannia c.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, during World War II QF 4 inch Mk XII gun on T class submarine AWM 306479.jpeg
Mk XII gun on unidentified T-class submarine, during 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 pounds (16 kg) projectile from late 1944. [2] Shortly after the end of hostilities, the Mk XXII was superseded in new British submarines by the lighter QF 4 inch Mk XXIII. [4]

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.

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References

  1. 1 2 3 4 Campbell, Naval Weapons of WWII, p.59.
  2. 1 2 DiGiulian
  3. 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)
  4. "Britain - 4"/33 (10.2 cm) QF Mark XXIII". www.navweaps.com. Tony DiGiulian. 22 October 2008. Retrieved 21 March 2014.
  5. "GUN WHICH FIRED THE FIRST SHOT AT SEA IN WW1 IS INSTALLED FOR NEW £4.5M REMEMBRANCE GALLERY". www.nmrn.org.uk. National Museum of the Royal Navy. 2014. Retrieved 2 January 2022.
  6. "Hartlepool in County Durham, England, United Kingdom - Naval Gun 4 inch". www.hmdb.org. Historical Marker Database. Retrieved 28 December 2021.
  7. "British Coastal Defences of the Falkland Islands". frontlineulster.co.uk. Frontline Ulster. Retrieved 28 December 2021.
  8. Skaarup, Harold A. (2012). Shelldrake: Canadian Artillery Museums and Gun Monuments. Bloomington, IN: iUniverse. pp. 2–3. ISBN   978-1469750002.

Sources