German destroyer Z21 Wilhelm Heidkamp

Z21 Wilhelm Heidkamp was one of six Type 1936 destroyers built for the Kriegsmarine in the late 1930s. Completed a few months before the start of World War II in September 1939, the ship served as a flagship throughout her career. She briefly patrolled the Skagerrak where she inspected neutral shipping for contraband goods. Z21 Wilhelm Heidkamp later helped to laid four offensive minefields off the English coast that claimed two British destroyers, 2 fishing trawlers, and twenty-seven merchant ships. During the German invasion of Norway in April 1940, she sank a Norwegian coastal defense ship off Narvik and was crippled with the opening shots of the First Naval Battle of Narvik on 10 April, with the loss of 81 crewmen. The ship sank the following day.

Z21 Wilhelm Heidkamp had an overall length of 125.10 meters and was 120 meters long at the waterline. The ship had a beam of 11.80 meters , and a maximum draft of 4.50 meters . She displaced 2,411 long tons at standard load and 3,415 long tons at deep load. The two Wagner geared steam turbine sets, each driving one propeller shaft, were designed to produce 70,000 PS using steam provided by six Wagner boilers for a designed speed of 36 knots . During Z21 Wilhelm Heidkamp's sea trials, she reached 37 knots from 69,950 PS , but a full-speed test was never conducted. The ship carried a maximum of 739 metric tons of fuel oil which gave a range of 2,050 nautical miles at 19 knots . Her crew consisted of 10 officers and 313 sailors.

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