Bjørgvin-class coastal defence ship
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Bjørgvin as HMS Glatton
|Preceded by:||Eidsvold-class battleship|
|Type:||Coastal defence ship|
|Displacement:||4,900 long tons (4,979 t)|
|Length:||94 m (308 ft 5 in)|
|Beam:||16.8 m (55 ft 1 in)|
|Draught:||5.4 m (17 ft 9 in)|
|Propulsion:||Coal-fired reciprocating steam engines, 4,000 shp (2,983 kW)|
|Speed:||15 knots (17 mph; 28 km/h)|
The Bjørgvin class coastal battleships were ordered by Norway in 1912 to supplement the older Eidsvold and Tordenskjold-class coastal defence ships. The two ships laid down were compulsorily purchased by the Royal Navy when World War I broke out, and classified as monitors. The British government paid Norway £370,000 as compensation for each ship.
Ships in class
- Bjørgvin (1912) - Compulsorily purchased by the British Navy and renamed HMS Glatton, blew up in September 1918.
- Nidaros (1912) - Compulsorily purchased by the British Navy and renamed HMS Gorgon.
The Bjørgvin class would be significantly more heavily armed than the previous Eidsvold class:
- Two 24 cm/50 guns, which in British service were relined to use standard British ammunition and became 9.2"/51. These were considered among the longest-ranged guns in the world in 1918. As designed, they would have fired a 190 kg (419 lb) projectile with a muzzle velocity of 884 m/s (2,900 ft/s), capable of penetrating 22.2 cm (8.75 in) of face-hardened armour at a range of 7,000 m (7,650 yards).
- Four 15 cm/50 in single turrets - one aft, one fore, two midships (one on either side). In British service they were relined to take standard 6 inch (15 cm) ammunition.
- Six 10 cm (3.94 in) guns.
- Two submerged torpedo tubes.
In addition to the heavier armament, the two ships of the Bjørgvin class were also significantly better armoured, with her armour better distributed:
- 7 inch (17.78 cm) thick armour in the belt
- 8 inch (20.32 cm) thick armour on the turrets
- 8 inch (20.32 cm) thick armour in the barbettes
- 2.5 inch (6.35 cm) thick armoured deck
- 8 inch (20.32 cm) thick armour on the conning tower
- 4 inch (10,16 cm) thick armoured bulkheads
- Model of KNM Bjørgnvin, head on view
- Details of the forecastle and details of bridge.
- The loss of the HMS Glatton, an "interesting little ship", retrieved 15 January 2007
- Model of KNM Bjørgnvin, from the website of the Norwegian Armed Forces Museum, retrieved 9 December 2005
- On guns, see Notes.
- Naval History via Flix: KNM Nidaros, retrieved 11 December 2005
- Naval History via Flix: Technical Details of Ship HMS Gorgon, retrieved 9 December 2005