|Ordnance QF 4 inch gun Mk V|
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|
World War II
|Weight||Barrel & breech 4,890 lb (2,220 kg)[2 ]|
|Barrel length||Bore 180 inches (4.6 m) (45 cal) Total 187.8 inches (4.8 m)[2 ]|
|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)[2 ]|
|Maximum range||16,300 yards (15,000 m)
AA 28,750 feet (8,800 m)[2 ]
|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.
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.
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.
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|