BL 8-inch Mk I – VII naval gun
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The BL 8 inch guns Mark I to Mark VII[note 2] were the first generations of British rifled breechloaders of medium-heavy calibre. They were initially designed for gunpowder propellants and were of both 25.5 and 30 calibres lengths.
Quick Facts Ordnance BL 8 inch gun Mks I - VII, Type ...
Ordnance BL 8 inch gun Mks I - VII | |
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Type | Naval gun Coast defence gun |
Place of origin | United Kingdom |
Service history | |
In service | 1884 - 190? |
Used by | United Kingdom Colonial navies of Australia New Zealand Singapore |
Production history | |
Designer | Mk I, VI : RGF Mk VII : EOC |
Manufacturer | Mk I, III, IV : RGF Mk III, IV, VI, VII EOC |
Unit cost | £6,015[1] |
Variants | Mks III, IV, VI, VII, VIIA |
Specifications | |
Mass | Mk III & VI : 14 tons Mk IV : 15 tons Mk VII : 12 tons Mk VIIA : 13 tons barrel & breech[2] |
Barrel length | Mk III : 201 inches (5,105 mm) Mk VII : 204 inches (5,182 mm) Mk IV & VI : 237 inches (6,020 mm) bore[2] |
Shell | Mks III, IV, VI : 210 pounds (95.25 kg) Mk VII : 180 pounds (81.65 kg)[note 1] |
Calibre | 8-inch (203.2 mm) |
Muzzle velocity | Mk III : 1,953 feet per second (595 m/s)[3] Mk IV & VI : 2,150 feet per second (655 m/s)[4] Mk VII : 2,000 feet per second (610 m/s)[5][6] |
Maximum firing range | 8,000 yards (7,300 m)[2][7] |
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