QF 4 inch Mk V naval gun
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|Ordnance QF 4 inch gun Mk V|
|File:QF 4 inch Mk V naval gun WWII AWM P00444.155.jpeg|
HA gun in action during World War II
Heavy anti-aircraft gun
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 180 inches (4.6 m) (45 cal) Total 187.8 inches (4.8 m)|
|Shell||Separate-loading QF or fixed QF 31 pounds (14.06 kg)|
|Calibre||4-inch (101.6 mm)|
|Breech||horizontal sliding block|
|Recoil||hydro - pneumatic 15 inches (380 mm)|
|Muzzle velocity||2,350 feet per second (716 m/s)|
|Maximum range||16,300 yards (15,000 m)|
AA 28,750 feet (8,800 m)
|Filling weight||5 pounds (2.27 kg)|
The QF 4 inch Mk V gun was a Royal Navy gun of World War I which was adapted on HA mountings to the heavy anti-aircraft role both at sea and on land, and was also used as a coast defence gun.
Royal Navy service
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 adaped to a high-angle anti-aircraft role, and was typically used on cruisers and heavier ships.
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. 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
From 1915 to 1928 several guns were mounted in forts to guard the estuary of the River Humber.
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|
- ^ 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.
- ^ a b c d 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". 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
- 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