BL 4-inch Mk VII naval gun
| Ordnance BL 4 inch gun Mk VII | |
|---|---|
 On HMAS Australia, 1918 | |
| Type | Naval gun |
| Place of origin | United Kingdom |
| Service history | |
| In service | 1908 - 1945 |
| Used by |  United Kingdom |
| Specifications | |
| Mass | 4,704 pounds (2,130 kg)[1] |
| Barrel length | 201.25 inches (5.112 m) bore (50.3 calibres)[1] |
| Shell | 31 pounds (14.06 kg) Common pointed, Common lyddite[1] |
| Calibre | 4 inches (101.6 mm) |
| Breech | Welin, single-motion screw[1] |
| Muzzle velocity | 2,852 feet per second (869 m/s)[2] |
| Maximum firing range | 11,600 yards (10,600 m)[3] |
The BL 4-inch gun Mk VII was a British high-velocity naval gun introduced in 1908 as an anti-torpedo craft gun in large ships, and in the main armament of smaller ships[1].
History
The guns armed the following warships :
- Bellerophon class battleships laid down 1906
- St. Vincent class battleships laid down 1907
- Boadicea class scout cruisers laid down 1907
- HMS Neptune laid down 1909
- Colossus class battleships laid down 1909
- Indefatigable class battlecruisers laid down 1909
- Orion class battleships laid down 1909
- Lion class battlecruisers laid down 1909
- Bristol class light cruisers laid down 1909
- Blonde class scout cruisers laid down 1909
- Active class scout cruisers laid down 1910
- King George V class battleships laid down 1911
In World War II many guns were used to arm merchant ships.
Image gallery
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Barrel dimensions -
Breech mechanism -
Percussion and electric locks
See also
Wikimedia Commons has media related to BL 4 inch Mk VII naval gun.
Notes
References
- HANDBOOK for the 4" Mark VII. and VIII. B.L. Guns 1913 (Corrected to September 1913.) ADMIRALTY Gunnery Branch, G.8652/13
- Tony DiGiulian, British 4"/50 (10.2 cm) BL Mark VII
External links
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