BL 13.5 inch naval gun Mk I – IV
|Ordnance BL 13.5 inch gun Mk I - IV|
Forward turret of HMS Hood
|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 Collingwood being equipped with inferior 12 inch guns and 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 4 13.5 inch guns each, in twin barbettes on the centreline at each end of the superstructure.
Coast defence service
Guns were also sold to Italy to arm the Re Umberto class battleships Re Umberto, Sicilia and Sardegna, laid down in 1884 and finally commissioned in 1893 - 1895.
- 12px Media related to BL 13.5 inch naval gun Mk I - IV at Wikimedia Commons
- 340mm/28 Modèle 1881 gun French equivalent
- List of naval guns
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- Text Book of Gunnery, 1902. LONDON : PRINTED FOR HIS MAJESTY'S STATIONERY OFFICE, BY HARRISON AND SONS, ST. MARTIN'S LANE
- 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 Palmerston Forts Society website