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Erwin Musger (* March 20, 1909 in Neumarkt/Krain (Austria-Hungary); † March 16, 1985 in Graz) was an Austrian aircraft and vehicle designer.

After attending elementary and middle school in his hometown, Musger received vocational training from 1925 to 1927 at the Federal Institute for Mechanical and Electrical Engineering in Klagenfurt. From 1927 to 1929, he attended the Electrical and Mechanical Engineering Trade School in Vienna.

Musger's first job was as a designer at the J. M. Voith company in St. Pölten, where he was involved in the construction of paper machines and ship propellers based on the Voith-Schneider system. In 1933, Musger was laid off due to lack of work and moved to Herzogenburg. Since 1930, he was a member of the local gliding club. In order to be able to fly more often than was possible within the club, Musger began planning and building a large fuselage glider, the Mg I. In 1933, after his discharge, he took over flight command and served as a ground commander until leaving the flying group in 1937. In 1934, he passed his C-level test with the Mg IV, which was developed from modifications of the Mg I.

During those years, he began building a motorized aircraft (Mg III), which was not completed until 1937. Starting in 1935, Musger designed a new two-seater, the Mg 9, whose statics were calculated by Eduard Walzl of the Akaflieg Graz. Numerous Austrian endurance flight records were set with this aircraft, with an Mg 9a, flown by Toni Kahlbacher as flight instructor on September 5/6, 1938, with a time of 23 hours and 41 minutes, and on September 8/10, 1939, with a time of 23 hours and 41 minutes. In September 1938, Musger set two world records in a two-seater with a flight time of 40 hours and 41 minutes.

In 1937, Musger designed a C-class training aircraft for the Austrian Aero Club (ÖAeC) under the designation Mg 12/12a, which went into small-scale production alongside the Mg 9a. In December 1937, he was appointed a designer and structural engineer at Wiener Neustädter Flughafen Betriebsgesellschaft mbH. During the war, Musger spent part of his time in Berlin at the Reich Air Ministry, where he worked on the development of control systems for cargo gliders.