page_title: Mode-class destroyer
section_title: Design
hierarchical_section_title: Mode-class destroyer / Design and development / Design
caption_attribution_description: English: Main gun of the Swedish destroyer HMS Mjölner. Svenska: Huvudkanon på jagaren HMS Mjölner.
context_page_description: The Mode class or Mjölner class was a class of four coastal destroyers commissioned by the Royal Swedish Navy during World War II. The design was based on the preceding Psilander class purchased from Italy but with Swedish equipment and armament. The destroyers served as coastal escorts. The class was moderately upgraded and reclassified as frigates during the early part of the Cold War. After nearly thirty years of service, the last vessel was retired in 1970.
context_section_description: The destroyers have been described as, "more an expression of standardization, simplicity and simple building methods than carefully planned men of war." They were small, only 78 m (255 ft 11 in) long, shorter than the British Hunt class of escort destroyers then being produced in large numbers for the Royal Navy and its allies. Displacement was 750 long tons (760 t) normal and 960 long tons (980 t) full load, beam 26 ft 3 in (8.00 m) and draught 8 ft 10 in (2.69 m). The bridge was wider than the superstructure, giving the vessels a distinctive appearance from the prow compared to other Swedish destroyers.
  Machinery consisted of two Penhoët A oil-fired boilers, which supplied steam to two de Laval geared steam turbines, each driving its own propeller. The turbines were rated at 16,000 shp (12,000 kW) to give a design speed of 30 knots (35 mph; 56 km/h). 190 long tons (190 t) of fuel was carried to give a range of 1,260 nautical miles (2,330 km) at 20 knots (23 mph; 37 km/h). A crew of 100 officers and ratings was carried.
caption: The forward gun aboard Mjölner
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