Heinkel HD 24

The Heinkel HD 24 was a training seaplane developed in Germany in the late 1920s, a conventional single-bay biplane with equal-span staggered wings, twin pontoons that could be swapped for wheels or skis, and a pilot and instructor in tandem open cockpits. Heinkel entered two HD 24s in the German Seeflugwettbewerb seaplane competition of 1926, where one finished third among only three aircraft to complete all the tests, which led to orders from the German DVS for 23 aircraft and from the Swedish Navy. The Swedish aircraft were built by Svenska Aero and, after naval aviation passed to the Swedish Air Force, entered service as the Sk 4. One HD 24 was exported to China, and another was bought by the explorer Gunther Pluschow, who flew it on a 1927 to 1928 expedition to Patagonia and Tierra del Fuego.