QF 4 inch Mk V naval gun

Ordnance QF 4 inch gun Mk V
High-angle gun aboard sloop HMS Weston on convoy escort during World War II
Type	Naval gun Anti-aircraft gun Coastal defence gun
Place of origin	United Kingdom
Service history
In service	1914 - 1940s
Used by	British Empire
Wars	World War I World War II
Production history
Number built	944^[1]
Specifications
Weight	Barrel & breech: 4,890 lb (2,220 kg)^[2]
Barrel length	Bore: 15 ft (4.6 m) (45 cal) Total: 15 ft 8 in (4.8 m)^[2]

Shell	31 lb (14.1 kg) fixed QF or Separate-loading QF
Calibre	4-inch (101.6 mm)
Breech	horizontal sliding block
Recoil	hydro-pneumatic or hydro-spring 15 inches (380 mm)
Elevation	mounting dependent
Traverse	mounting dependent
Muzzle velocity	2,350 ft/s (716 m/s)^[2]
Maximum firing range	Surface: 16,300 yd (15,000 m)^[3] AA: 28,750 ft (8,800 m)^[2]
Filling	Lyddite, Amatol
Filling weight	5 pounds (2.27 kg)

The QF 4 inch Mk V gun^{[note 1]} was a Royal Navy gun of World War I which was adapted on HA (i.e. high-angle) mountings to the heavy anti-aircraft role both at sea and on land, and was also used as a coast defence gun.

Service

Naval service

LA gun and crew on HMS Galatea, February 1917

LA gun on HMS Vampire firing circa 1938

This QF gun was introduced to provide a higher rate of fire than the BL 4 inch Mk VII. It first appeared in 1914 as secondary armament on Arethusa class cruisers, was soon adapted to a high-angle anti-aircraft role. It was typically used on cruisers and heavier ships, although V and W class destroyers of 1917 also mounted the gun.

Mk V was superseded by the QF 4 inch Mk XVI as the HA (i.e. anti-aircraft) gun on new warships in the 1930s, but it continued to serve on many ships such as destroyers, light and heavy cruisers in World War II.^[4]

Army anti-aircraft gun

Early in World War I several guns were supplied by the Navy for evaluation as anti-aircraft guns for the home defence of key installations in Britain. They were mounted on static platforms and proved fairly successful after a fixed round was developed to replace the original separate round, and more followed. The AA mounting allowed elevation to 80° but loading was not possible above 62°, which slowed the maximum rate of fire.^[5] At the Armistice a total of 24 guns were employed in AA defences in Britain and 2 in France.^[6] After World War I the guns were returned to the Navy.

Coast Defence gun

From 1915 to 1928 several guns were mounted in forts to guard the estuary of the River Humber.^[7]

Anti-aircraft performance

The following table^[8] compares the gun's performance with the other British World War I anti-aircraft guns:-

Gun	m/v ft/s	Shell (lb)	Time to 5,000 ft (1,500 m) at 25° (seconds)	Time to 10,000 ft (3,000 m) at 40° (seconds)	Time to 15,000 ft (4,600 m) at 55° (seconds)	Max. height (ft)^[9]
QF 13 pdr 9 cwt	1990	12.5	10.1	15.5	22.1	19,000
QF 12 pdr 12 cwt	2200	12.5	9.1	14.1	19.1	20,000
QF 3 inch 20 cwt 1914	2500	12.5	8.3	12.6	16.3	23,500
QF 3 inch 20 cwt 1916	2000	16	9.2	13.7	18.8	22,000^[10]
QF 4 inch Mk V World War I	2350	31 (3 c.r.h.)	4.4??	9.6	12.3	28,750
QF 4 inch Mk V World War II ^[11]	2350	31 (4.38/6 c.r.h.)	?	?	?	31,000

Ammunition

Ammunition for the original low-angle guns introduced in World War I was Separate QF i.e. the shell and cartridge were separate items, but in World War II most guns used Fixed QF ammunition i.e. a single unit.

Fixed QF cartridge for LA (low-angle) gun, 1930s
Crew storing fixed rounds on the Kingfisher class sloop HMS Widgeon, August 1943

Surviving examples

A gun from HMNZS Tutira in front of the Devonport Naval Base, Auckland, New Zealand

Notes

↑ Mk V = Mark 5. Britain used Roman numerals to denote Marks (models) of ordnance until after World War II. Mark V indicates this was the fifth model of QF 4-inch gun.

References

↑ Tony DiGiulian quotes 283 Mk VC built for the navy during WWII; 554 earlier types built for the navy; about 107 earlier types built for the Army in WWI.
1 2 3 4 Hogg & Thurston 1972, Page 101
↑ WWI 3 c.r.h. HE shell. Tony DiGiulian, "British 4"/45 (10.2 cm) QF Mark V and Mark XV"
↑ Tony DiGiulian's webpage provides comprehensive information on this gun's Naval service. Tony DiGiulian (January 13, 2008). "British 4"/45 (10.2 cm) QF Mark V and Mark XV". Retrieved 2008-03-29.
↑ Hogg & Thurston 1972, Page 100
↑ Routledge 1994, Page 27
↑ Hogg & Thurston 1972, Page 98
↑ Routledge 1994, Page 9
↑ Hogg & Thurston 1972, Page 234-235
↑ Routledge 1994, Page 13
↑ WWII details from Tony DiGiulian's website

Bibliography

Tony DiGiulian, British 4"/45 (10.2 cm) QF Mark V and Mark XV
I.V. Hogg & L.F. Thurston, British Artillery Weapons & Ammunition 1914-1918. London: Ian Allan, 1972.
Brigadier N.W. Routledge, History of the Royal Regiment of Artillery. Anti-Aircraft Artillery, 1914-55. London: Brassey's, 1994. ISBN 1-85753-099-3

External links

Wikimedia Commons has media related to QF 4 inch Mk V naval gun.

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

British Empire Small Arms & Ordnance of the First World War

No. 1
No. 2 Hales Pattern
Nos. 3, 20, 24, 35 Hales rifle grenades
Nos. 5, 23, 36 Mills
No. 6
Nos. 8, 9 Jam Tin
No. 13 Battye
No. 14 Pitcher
No. 15 Ball
No. 16 Oval
No. 17 Opera hat
No. 18
No. 19
No. 21 "Spherical"
No. 22 Newton-Pippin
No. 25 Sangster
No. 27
No. 28 Chemical
No. 29 Gas
No. 31 Day Signal
No. 32 Night Signal
No. 32 "Spherical E"
No. 34 Egg
No. 37
No. 39 Steuart Pattern

Artillery

Tank guns	QF 6 pounder Hotchkiss QF 6 pounder 6 cwt

Infantry guns	1.59-inch Breech-Loading Vickers Q.F. Gun, Mk II ("Vickers-Crayford rocket gun")

Field Artillery	BL 12 pounder 6 cwt QF 12 pounder 8 cwt QF 12 pounder 18 cwt QF 13 pounder BL 15 pounder BLC 15 pounder QF 15 pounder QF 18 pounder QF 4 inch gun Mk III BL 4 inch gun Mk VII QF 4.5 inch Howitzer

Mountain artillery	RML 2.5 inch Mountain Gun BL 10 pounder Mountain Gun BL 2.75-inch Mountain Gun QF 2.95 inch Mountain Gun QF 3.7-inch mountain howitzer

Howitzers, medium, and heavy artillery	QF 4.7 inch Gun BL 5 inch Howitzer BL 5.4 inch Howitzer BL 60 pounder gun BLC 6 inch siege gun BL 6 inch Gun Mk VII BL 6 inch Gun Mk XIX BL 6-inch 26 cwt howitzer BL 6-inch 30 cwt howitzer BL 8 inch Howitzer Mk I - V BL 8 inch Howitzer Mk VI - VIII

Siege artillery	BL 7.5 inch Mk III naval gun BL 9.2-inch howitzer BL 9.2 inch Mk X naval gun BL 12 inch Howitzer BL 12 inch Mk X naval gun BL 15 inch Howitzer

Coastal artillery	QF 4 inch naval gun Mk I – III BL 6 inch Mk VII naval gun BL 9.2 inch gun Mk IX–X RML 9 inch

Mortars

Grenade launchers

Smoke and chemical weapons

Railway guns

Anti-aircraft guns

Foreign weapon designs
in British Empire Armies use

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)

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