Plans of panserskipet Tordenskjold
Class overview
Name	Tordenskjold class
Operators	Royal Norwegian Navy
Preceded by	None
Succeeded by	Eidsvold class
Built	1897–1898
In commission	1898–1948
Completed	2
Scrapped	2
General characteristics [1]
Type	Coastal defence ship
Displacement	3,858 long tons (3,920 t)
Length	92.66 m (304 ft 0 in) (oa) 85.34 m (280 ft 0 in) pp[2]
Beam	14.78 m (48 ft 6 in)
Draught	5.38 m (17 ft 8 in)
Installed power	3 cylindrical boilers 4,500 ihp (3,356 kW)
Propulsion	2 × triple-expansion steam engines
Speed	16.9 knots (31.3 km/h; 19.4 mph)
Complement	245
Armament	2 × 21 cm (8.3 in) guns 6 × 12 cm (4.7 in) guns 6 × 12-pdr (76 mm (3 in)) guns 6 × 1-pdr QF guns 2 × 45 cm (17.7 in) torpedo tubes
Armour	Harvey armor Belt : 7–4 in (178–102 mm) Turrets : 8–5 in (203–127 mm)

The Tordenskjold class of coastal defence ships was ordered by Norway as part as the general rearmament in the time leading up to the events in 1905 - when Norway broke out of the union with Sweden - the two ships in the class (Tordenskjold and Harald Haarfagre) remained the backbone (alongside the slightly newer Eidsvold class) of the Royal Norwegian Navy until they were considered 'unfit for war' in the mid-1930s.

Designed and built as typical pre-dreadnought battleships, although on a scale more suited to the fjords and narrow waters of Norway, the Tordenskjold class carried guns in a wide range of calibers:

• Two 21 cm/45 (8.2 inch) guns in turrets fore and aft as the main armament.
• Six 12 cm/45 (4.7 inch), mounted three on each side in a central battery, as the secondary armament.
• Six 7.6 cm/40 (3 inch) guns, also mounted in the central battery, as the tertiary armament.
• Six 1-pdr Quick Fire guns. These were meant to be used against torpedo boats.

The Tordenskjold class was armoured to withstand battle with ships of a similar class, but her protection system could not withstand attacks from heavier ships nor underwater attacks very well:

• 7 inch (17.78 cm) Harvey armour in the belt
• 8 inch (20.32 cm) of the same armour on the turrets

Both ships were phased out from active duty in the mid-1930s, and were used as training vessels. After the German invasion of Norway in 1940, they were taken by the Germans and turned into floating Flak batteries. After the war they were returned to the Royal Norwegian Navy and served as barracks for a short time before they were sold for scrapping.

• 
  Photograph of
  P/S Tordenskjold from 1900.
• 
  Models of the coastal defence cruisers Tordenskiold (front) and Eidsvold.

Wikimedia Commons has media related to Tordenskjold class coastal defence ship.

• Brook, Peter. Warships for Export: Armstrong Warships 1867–1927. Gravesend, UK: World Ship Society, 1999. ISBN 0-905617-89-4.
• Chesneau, Roger and Eugene M. Kolesnik. Conway's All The World's Fighting Ships 1860–1905. London: Conway's Maritime Press, 1979. ISBN 0-85177-133-5.
• Dodson, Aidan & Nottlemann, Dirk (2023). "The German Flak Ships, Part I: The German and ex-Norwegian Hulls". In Jordan, John (ed.). Warship 2023. Oxford: Osprey Publishing. pp. 112–127. ISBN 978-1-4728-5713-2.

• Naval History via Flix: KNM Harald Haarfagre, retrieved 12 December 2005