|Ordnance QF 4 inch gun Mk V|
HA gun in action during World War II
Coastal defence gun
|Place of origin||United Kingdom|
|In service||1914 - 1940s|
|Used by||British Empire|
|Wars||World War I|
World War II
|Weight||Barrel & breech: 4,890 lb (2,220 kg)|
|Barrel length||Bore: 15 ft (4.6 m)|
Total: 15 ft 8 in (4.8 m)
|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)|
|Muzzle velocity||2,350 ft/s (716 m/s)|
|Maximum range||Surface: 16,300 yd (15,000 m)|
AA: 28,750 ft (8,800 m)
|Filling weight||5 pounds (2.27 kg)|
Service[edit | edit source]
[edit | edit source]
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.
Army anti-aircraft gun[edit | edit source]
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. At the Armistice a total of 24 guns were employed in AA defences in Britain and 2 in France. After World War I the guns were returned to the Navy.
Coast Defence gun[edit | edit source]
From 1915 to 1928 several guns were mounted in forts to guard the estuary of the River Humber.
Anti-aircraft performance[edit | edit source]
The following table 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)|
|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|
|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 ||2350||31 (4.38/6 c.r.h.)||?||?||?||31,000|
Ammunition[edit | edit source]
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.
See also[edit | edit source]
Weapons of comparable role, performance and era[edit | edit source]
- 10.5 cm SK L/45 naval gun Approximate German equivalent firing slightly heavier shell
Surviving examples[edit | edit source]
Notes and references[edit | edit source]
- 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.
- 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"
- 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.
- 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". http://www.navweaps.com/Weapons/WNBR_4-45_mk5.htm. 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[edit | edit source]
- 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
[edit | edit source]
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