|Ordnance BL 13.5 inch gun Mk I - IV|
The forward 13.5-inch (343-mm) gun turret of the battleship HMS Hood in the 1890s.
|Place of origin||United Kingdom|
|Used by|| United Kingdom|
|Designer||Elswick Ordnance Company|
|Variants||Mk I, II, III, IV|
|Weight||67-69 tons barrel & breech|
|Barrel length||405 inches (10.29 m) bore (30 calibres)|
|Shell||1,250 pounds (570 kg)|
|Calibre||13.5-inch (342.9 mm)|
|Muzzle velocity||2,016 feet per second (614 m/s)|
|Effective range||12,000 yards (11,000 m)|
United Kingdom service
The gun was designed to match the new large guns of the French Amiral Baudin-class battleships. Development and manufacture occurred very slowly. It was originally intended to equip the Admiral-class battleships, begun in 1880, but delays led to HMS Collingwood being equipped with inferior 12 inch guns and HMS Benbow with the subsequently unsuccessful 16.25 inch guns.
The remaining Admiral-class ships, Anson, Camperdown, Howe and Rodney, were eventually completed in 1889 equipped with four 13.5 inch guns each, in twin barbettes on the centreline at each end of the superstructure.
Coast defence service
Weapons of comparable role, performance and era
- 340mm/28 Modèle 1881 gun French equivalent
- Mk I = Mark 1, Mk II = Mark 2, Mk III = Mark 3, Mk IV = Mk 4. Britain used Roman numerals to denote marks (models) of ordnance until after World War II. Hence this article covers the first four models of British 13.5 inch guns
- Text Book of Gunnery 1902, Table XII, Page 336
- 1,250 lb shell, with 630 lb Slow-burning Brown Prismatic powder or 187 lb cordite size 44. Text Book of Gunnery, 1902.
- Palmerston Forts Society
- Text Book of Gunnery, 1902. London: Printed for His Majesty's Stationary Office, by Harrison and Sons, St. Martin's Lane
|Wikimedia Commons has media related to BL 13.5 inch naval gun Mk I - IV.|
- Tony DiGiulian, British 13.5"/30 (34.3 cm) Marks I, II, III and IV
- Diagram showing gun on disappearing mounting, as mounted at Penlee Battery, Plymouth at Victorian Forts and Artillery website
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