Bjørgvin class battleship

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Bjørgvin-class coastal battleship
Class Overview
Class type: Coastal defence ship
Preceded by: Eidsvold-class
Succeeded by: N/A, Last battleship line authorized by Norwegian government
Ships of the line: Bjørgvin, Nidaros
General characteristics
Displacement: 4,900 tons
Length: 94.00 m
Beam: 16.80 m
Draft: 5.40 m
Speed: 15 knots (27.8 km/h)
Complement: 305
Power: 4,000 shp (2,982.8 KW)
Drive: Reciprocating steam engines
Fuel: Coal
Armament: 2 x 24 cm (9.45 inch) guns
4 x 15 cm (5.90 inch) guns
6 x 10 cm (3.94 inch) guns
2 x submerged torpedo tubes
Armour Belt:7 inch (17.78 cm)
Bulkheads:4 inch (10,16 cm)
Barbettes:8 inch (20.32 cm)
Turrets:8 inch (20.32 cm)
Decks:2.5 inch (6.35 cm)
Conning tower:8 inch (20.32 cm)

The Bjørgvin class coastal battleships were ordered by Norway in 1912 to supplement the older Eidsvold class and Tordenskjold class coastal defence ships. The two ships laid down were compulsoraly 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.

Contents

[edit] Ships in class

  • Bjørgvin (1912) - Compulsoraly purchased by the British Navy and renamed HMS Glatton, blew up in September 1918.
  • Nidaros (1912) - Compulsoraly purchased by the British Navy and renamed HMS Gorgon.

[edit] Description

The Bjørvin 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.[1] 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 in (15 cm) ammunition.[2]
  • 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 signigicantly 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.

[edit] External links

[edit] Notes

  1. ^ British 9.2"/51 (23.4 cm) Mark XII, updated 8 April 2005, retrieved 9 December 2005
  2. ^ British 6"/49 (15.2 cm) BL Mark XVIII, updated 1 April 2005, retrieved 9 December 2005

[edit] References