The Undervattensbåten No 2 class was a trio of coastal submarines operated by the Swedish Navy between 1909 and 1930. The boats were some of the earliest Swedish submarines and were heavily based on , the first of her kind. The submarines, numbered 2 through 4, operated for two decades before being discarded by 1930.
Development and design In 1900, the Swedish Navy sent Carl Richson to the United States, who was ordered to study submarines. After his return, he was inspired by and designed , Sweden's first submarine. After Hajen entered service in 1904, Richson revisited the design in 1909. He enlarged the superstructure and added an outer casing, which entered service as the Undervattensbåten No 2 class. Several years later, the design was again modified, with better engines and superstructure, to create the s.
The class measured in length with a beam of , draught of , and displaced 128 tons surfaced and 230 tons submerged. The complement consisted of 12 officers and crew. They were powered by a pair of Polar six-cylinder diesel engines and one electric motor that produced and respectively, which drove two propellers. This gave a maximum speed of on the surface and submerged. Armament consisted of a single torpedo tube mounted in the bow with a total capacity of three torpedoes.
The submarines were built by Motala Verkstad and were all launched in 1909. After entering service, the submarines operated along the Swedish archipelago before they were decommissioned between 1929 and 1930.
Ships in class +DataNameLaid downLaunchedCommissionedStrickenUnderettensbåten No 2190825 February 190919096 June 1929Underettensbåten No 3190814 April 1909190921 November 1930Underettensbåten No 4190916 October 190919106 June 1929 References