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Ordnance BL-4-inch Mk VIII naval gun
HMS Defender 1911 4-inch gun.jpg
Forward gun of HMS Defender
Type Naval gun
Service history
In service 1908–1945
Used by United Kingdom
Australia
Wars World War IWorld War II
Production history
Designed 1904[1]
Number built Mk VIII: 246
Mk XI: 30[1]
Variants Mk VIII – Mk XI[1]
Specifications
Weight 2,912 pounds (1,320 kg) (barrel & breech)[2]
Barrel length 159.2 inches (4.044 m) bore (40 calibres)[2]

Shell 31 pounds (14.06 kg) Common pointed, Common lyddite[2]
Calibre 4 inches (101.6 mm)
Breech Welin, single-motion screw[2]
Elevation -10° to +20°[1]
Rate of fire 6-8 RPM[1]
Muzzle velocity 2,287 feet per second (697 m/s)[3]
Maximum range 10,210 yards (9,340 m)[1]

The BL 4-inch Mark VIII naval gun[note 1] was a British medium-velocity wire-wound naval gun introduced in 1908 as an anti-torpedo boat gun in smaller ships whose decks could not support the strain of the heavier and more powerful Mk VII gun.[2]

Mk VIII history

Breech of gun on HMAS Huon in March 1919

The gun succeeded the QF 4-inch Mk III, whose 25-pound (11 kg) shell had been considered insufficiently powerful for its intended role. The BL Mk VIII fired a 31-pound (14 kg) shell. It armed the following warships :

The gun was succeeded in its class from 1911 by the QF 4-inch Mk IV.

In World War II many guns were used to arm merchant ships.

Mk XI submarine gun

A Mark XI-variant was adapted to arm the K-class submarines laid down 1915.

See also

Notes

  1. Mark VIII = Mark 8. Mark XI = Mark 11. Britain used Roman numerals to denote marks (models) of ordnance until after World War II. This was the eighth model of British BL 4-inch gun.

References

  1. 1.0 1.1 1.2 1.3 1.4 1.5 DiGiulian
  2. 2.0 2.1 2.2 2.3 2.4 HANDBOOK for the 4" Mark VII. and VIII. B.L. Guns 1913
  3. 2287 ft/second firing a 31 lb 3 CRH projectile, using 5 lb 4 oz cordite MD size 16 propellant. HANDBOOK for the 4" Mark VII. and VIII. B.L. Guns 1913.

Sources

External links


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