BL 4-inch Mk IX naval gun

Ordnance BL 4-inch Mk IX gun
On Flower-class corvette HMCS Calgary in World War II
TypeNaval gun
Service history
In service1917–1945
Used by Royal Navy
Canada Royal Canadian Navy

Free FranceFree French Navy
GreeceHellenic Navy
IndiaRoyal Indian Navy
NetherlandsNetherlands Navy
New ZealandRoyal New Zealand Navy
NorwayNorwegian Navy

Union of South AfricaSouth African Navy
WarsWorld War I
World War II
Production history
No. built2,382[1]
Specifications
Mass2 tons barrel & breech[2]
Barrel length180 inches (4.572 m) bore (45 calibres)
Shell31 pounds (14.1 kg)
Calibre4 inches (101.6 mm)
BreechWelin interrupted screw
Elevation-10 degrees to +30 degrees[3]
Rate of fire10-12 rpm[3]
Muzzle velocity800 metres per second (2,600 ft/s)[2]
Maximum firing range12,660 metres (13,850 yd)[2]

The BL 4-inch Mk IX naval gun[note 1] was a British medium-velocity naval gun introduced in 1917 as secondary armament on the Renown-class battlecruisers and Glorious-class "large light cruisers", but which served most notably as the main armament on Flower-class corvettes throughout World War II.

  1. ^ Campbell, Naval Weapons of WWII, pp.42-43.
  2. ^ a b c http://navalhistory.flixco.info/H/77826x53535/8330/a0.htm[dead link]
  3. ^ a b Campbell, Naval Weapons of WWII, p.38.


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