Havmanden-class submarine (1911)

Havmanden, the class leader of the Havmanden class
Class overview
Builders	Whitehead & Co., Fiume (3)[1] Copenhagen Navy Yard (3)[1]
Operators	Royal Danish Navy
Preceded by	Dykkeren
Succeeded by	B class
Built	1911–1914
In commission	1912–1932
Completed	6
Retired	6
General characteristics
Type	Submarine
Displacement	164 tonnes (181 short tons) surfaced 204 tonnes (225 short tons) submerged[1]
Length	127 ft 8 in (38.91 m)[1]
Beam	11 ft 10 in (3.61 m)[1]
Draft	7 ft 7 in (2.31 m)[1]
Propulsion	1 × shaft 1 × 6-cylinder diesel engine, 430–450 bhp (320–340 kW) 2 × electric motors[1]
Speed	13 knots (24 km/h) surfaced 10 knots (19 km/h) submerged[1]
Range	1,400 nautical miles (2,600 km) at 10 knots (19 km/h) surfaced[1] 23 nautical miles (43 km) at 8 knots (15 km/h) submerged
Complement	10, as built; 14, later[1]
Armament	2 × 457 mm (18 in) bow torpedo tubes 1 × 8 mm (0.31 in) machine gun (after 1917)[1]

The Havmanden class was a class of six submarines built for the Royal Danish Navy from 1911 to 1914. Also later known as the A class, the boats were designed by the Austro-Hungarian firm Whitehead & Co. of Fiume. The first three submarines were built by the company, while the remaining three were constructed under license in Copenhagen.

The boats were just over 127 feet (39 m) long and their armament consisted of two 457 mm (18 in) bow torpedo tubes, later supplemented with an 8 mm (0.31 in) machine gun. The boats had a single shaft and were propelled by a Fiat or M.A.N. diesel engine on the surface and two electric motors while submerged.

Although there was at least one close call for the class leader Havmanden during World War I, none of the six boats was sunk in service. All six boats of the class remained active in the Royal Danish Navy from their time of construction until 1928, when the first two boats were stricken. The remaining boats were all stricken by 1932. The Havmanden class served as the basis for the Austro-Hungarian Navy's U-20-class submarines built during World War I.