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QF 4-inch naval gun Mk IV, XII, XXII 
Summary
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.
| Ordnance QF 4 inch gun Mk IV, XII, XXII | |
|---|---|
 | |
| 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 |
| Production history | |
| No. built | 1,141[1] |
| Specifications | |
| Mass | 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[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 range | 11,580 yards (10,590 m) at +30°[1] |
Mk IV gun edit
On R-class destroyer HMS Satyr c. 1917–1918
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 :
- 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)
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Rusted QF 4 inch mk IV gun without a gun shield on East Falkland -
Back of rusted QF 4 inch mk IV gun without a gun shield -
Front of QF 4 inch mk IV gun in Imperial War Museum -
Back of QF 4 inch Mk IV gun at Imperial War Museum -
British sailors loading a QF 4 inch Mk IV gun in 1942 -
Diagram of a QF 4 inch Mk IV gun cartridge.
Mk XII and XXII submarine gun edit
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 edit
Surviving guns edit
- The Mk IV gun from HMS Lance which fired the first British shot of World War I on 5 August 1914 is on display at the National Museum of the Royal Navy, Portsmouth (on loan from the Imperial War Museum).[5]
- A Mk IV gun on a 1945 Mk XVI mounting is on display at the Heugh Gun Battery Museum in Hartlepool, County Durham.[6]
- A Mk IV gun on a pedestal mounting is still in situ at Ordnance Point in the Falkland Islands, where it is believed to have been installed in 1943.[7]
- A First World War 4-inch naval gun, tentatively identified as a Mk IV, stands outside the Army, Navy and Air Force Veterans Hall in 4th Street, Sidney, British Columbia.[8]
See also edit
Weapons of comparable role, performance and era edit
- 10.5 cm SK L/45 naval gun : German WWI equivalent
- 10.5 cm SK C/32 naval gun : Slightly more powerful German equivalent WWII submarine gun
- 4"/50 caliber gun : US Navy equivalent
Notes edit
- ^ 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 edit
- ^ a b c d Campbell, Naval Weapons of WWII, p.59.
- ^ a b DiGiulian
- ^ 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)
- ^ "Britain - 4"/33 (10.2 cm) QF Mark XXIII". www.navweaps.com. Tony DiGiulian. 22 October 2008. Retrieved 21 March 2014.
- ^ "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.
- ^ "Hartlepool in County Durham, England, United Kingdom - Naval Gun 4 inch". www.hmdb.org. Historical Marker Database. Retrieved 28 December 2021.
- ^ "British Coastal Defences of the Falkland Islands". frontlineulster.co.uk. Frontline Ulster. Retrieved 28 December 2021.
- ^ Skaarup, Harold A. (2012). Shelldrake: Canadian Artillery Museums and Gun Monuments. Bloomington, IN: iUniverse. pp. 2–3. ISBN 978-1469750002.
Sources edit
- Tony DiGiulian, British 4"/40 (10.2 cm) QF Marks IV, XII and XXII
- Campbell, John (1985). Naval Weapons of World War Two. Annapolis, MD: Naval Institute Press. ISBN 0-87021-459-4.
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