HNoMS Mjølner
Drawing of Mjølner's sister Skorpionen
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| History | |
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.svg){kind=small}  Norway
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| Name: | HNoMS Mjølner |
| Namesake: | Mjöllnir |
| Operator: | Royal Norwegian Navy |
| Ordered: | 1867 |
| Builder: | Motala Verkstad, Norrköping |
| Cost: | 1,102,000 Norwegian krone |
| Laid down: | 1867 |
| Launched: | 1868 |
| Completed: | 7 September 1868 |
| Fate: | Scrapped, 1909 |
| General characteristics | |
| Class and type: | John Ericsson-class monitor |
| Displacement: | 1,501 metric tons (1,477 long tons) |
| Length: | 60.88 m (199 ft 9 in) |
| Beam: | 13.54 m (44 ft 5 in) |
| Draft: | 3.4 m (11 ft 2 in) |
| Installed power: | 380 ihp (280 kW) |
| Propulsion: | 1 shaft, 1 Vibrating lever steam engine, 4 cylindrical boilers |
| Speed: | 6.5 knots (12.0 km/h; 7.5 mph) |
| Range: | 950 nautical miles (1,760 km; 1,090 mi) |
| Complement: | 80–104 |
| Armament: | 2 × 270 mm (10.6 in) Armstrong guns |
| Armor: |
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HNoMS Mjølner was the fourth of five ships of the John Ericsson-class monitors built for the Royal Swedish Navy and the Royal Norwegian Navy in the mid-1860s. Impressed by the use of ironclads during the American Civil War, the design was based on that of the USS Monitor. They were designed under the supervision of the Swedish-born inventor, John Ericsson—coincidentally, designer of the Monitor—, and built in Sweden. Mjølner was delivered in 1868 and ran aground the following year, although she was not seriously damaged. The ship was reconstructed in 1897 and given modern breech-loading guns. Mjølner was sold for scrap in 1909.
The John Ericsson-class ironclads were designed to meet the need of the Swedish and Norwegian Navies for small, shallow-draft armored ships capable of defending their coastal waters. The standoff between the USS Monitor and the much larger CSS Virginia during the Battle of Hampton Roads in, early 1862, roused much interest in Sweden in this new type of warship, as it seemed ideal for coastal defense duties. John Ericsson, designer and builder of the Monitor, born in Sweden—although becoming an American citizen in 1848—offered to share his design with the Swedes. In response, they sent Lieutenant John Christian d'Ailly to the United States to study monitor design and construction under Ericsson. D'Ailly arrived in July 1862 and toured rolling mills, gun foundries, and visited several different ironclads under construction. He returned to Sweden in 1863 having completed the drawings of a Monitor-type ship under Ericsson's supervision.
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