The Bucker Bu 131 Jungmann was a German two-seat biplane trainer used during World War II. The aircraft was designed by Swedish-born designer Ing. Anders J. Anderson, who led all design work at Bucker until 1939.
The first flight of the prototype Bu 131 (D-3150) was made on 27 May 1934 with Joachim von Koppen as the pilot. The aircraft was powered by a Hirth HM 60 R inline four-cylinder engine with a power of 59 kW. Series production of the Bu 131 A version was started in 1934, with the Deutscher Luftsportverband as the main customer. In 1936, the Bu 131 B series was launched, which differed by the built-in 77 kW Hirth HM 504 A-2 engine.
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