QF 4 inch naval gun Mk IV, XII, XXII

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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 :

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

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guns fired a heavier 35-pound projectile from late 1944.^[1] Shortly after the end of hostilities, the Mk XXII was superseded in new British submarines by the lighter QF 4 inch Mk XXIII.^[3]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

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.

Notes

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References

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Bibliography

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

External links

↑ ^1.0 ^1.1 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)
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[DiGiulian-1] 1.0 ^1.1 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)

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[note 1]

[1]

[3]

v t e British Empire naval weapons of the First World War
Monitor guns	BL 9.2 inch Mk VI BL 9.2 inch Mk VIII BL 9.2 inch Mk X BL 9.2 inch Mk XII BL 12 inch Mk VIII US 14 inch 45 cal BL 18 inch Mk I
Capital ship main armament	Vickers 10 inch 45 cal EOC 10 inch 45 cal BL 12 inch Mk VIII BL 12 inch Mk IX BL 12 inch Mk X BL 12 inch Mk XI & XII EOC 12 inch 45 cal Mk XIII BL 13.5 inch Mk V EOC 14 inch 45 cal Mk I BL 15 inch Mk I
Armoured cruiser main armament	BL 7.5 inch Mk I BL 9.2 inch Mk X BL 9.2 inch Mk XI
Secondary armament and light cruiser main armament	QF 12 pdr 18 cwt QF 14 pounder Maxim-Nordenfelt QF 14 pounder Mk I & II QF 4 inch Mk III BL 4 inch Mk VII QF 4 inch Mk V BL 4 inch Mk IX BL 5.5 inch Mk I QF 6 inch BL 6 inch Mk VII BL 6 inch Mk XI BL 6 inch Mk XII BL 6 inch Mk XIII-XVIII BL 7.5 inch Mk II - Mk V
Destroyer and small cruiser armament	QF 12 pdr 12 cwt Mk II QF 4 inch Mk III BL 4 inch Mk VIII QF 4 inch Mk IV BL 4.7 inch Mk I
Merchant ship armament	QF 4.7 inch Mk I - IV QF 4.7 inch Mk V*
Submarine guns	BL 4 inch Mk XI QF 4 inch Mk XII
Anti-aircraft guns	QF 2 pounder "pom-pom" Mk II QF 3 inch 20 cwt QF 4 inch Mk V
Light weapons	.303 Vickers machine gun QF 3 pounder Hotchkiss QF 3 pounder Vickers QF 6 pounder Hotchkiss
Torpedoes	18 inch Mk V - VIII 21 inch Mk II 21 inch Mk IV
Mines	Spherical Mk I, II and III Vickers Elia mine Type H mine
Anti-submarine weapons	Type A Depth charge Type B Depth charge Type C Depth charge Type D Depth charge Type E Depth charge Type F Depth charge Type G Depth charge Cruiser Mine 7.5 inch howitzer
Landing guns	QF 12 pounder 8 cwt

v t e British Commonwealth naval weapons of the Second World War
Monitor guns	BL 15 inch
Capital ship main armament	BL 14 inch BL 15 inch BL 16 inch
Heavy cruiser main armament	BL 7.5 inch Mk VI BL 8 inch Mk VIII
Secondary armament and light cruiser main armament	QF 4 inch Mk V QF 4.5 inch QF 5.25 inch BL 6 inch Mk XII BL 6 inch Mk XXII BL 6 inch Mk XXIII
Minesweeper, Sloop, Corvette, Frigate and Destroyer armament	QF 6 pounder 10 cwt QF 12 pdr 12 cwt Mk V QF 4 inch Mk IV BL 4 inch Mk IX QF 4 inch Mk XVI QF 4 inch Mk XIX QF 4.5 inch BL 4.7 inch Mk II QF 4.7 inch Mk IX & XII QF 4.7 inch Mk XI
Submarine guns	QF 12 pdr 12 cwt Mk V QF 3 inch 20 cwt QF 4 inch Mk XII & XXII
Anti-aircraft weapons	Unrotated Projectile Holman Projector 20 mm Oerlikon QF 2 pounder "pom-pom" Mk VIII 40 mm Bofors QF 3 inch 20 cwt QF 4 inch Mk V QF 4 inch Mk XVI QF 4.5 inch QF 4.7 inch Mk VIII
Light weapons	.303 Lewis machine gun .50 Vickers Mk III machine gun QF 3 pounder Vickers
Torpedoes	21 inch Mk VII 21 inch Mk VIII 21 inch Mk X 21 inch Mk XI 24.5 inch Mk I
Anti-submarine weapons	Thornycroft depth charge thrower Hedgehog Squid
Small craft armament	Molins 6 pounder Vickers K machine gun 18 inch torpedo
Foreign-sourced weapons	20 mm Oerlikon 40 mm Bofors 3-inch 23 caliber gun (US) 3-inch 50 caliber gun (US) 4-inch 50 caliber Mark 9 gun (US) 5-inch 51 caliber Mark 8 gun (US) Y-gun depth charge projector (US) Mark 8 torpedo (US)

QF 4 inch naval gun Mk IV, XII, XXII

Contents

Mk IV gun

Mk XII and XXII submarine gun

Mk XII and XXII equipped submarines

Surviving guns

See also

Weapons of comparable role, performance and era

Notes

References

Bibliography

External links

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