Weser Flugzeugbau GmbH, known as Weserflug, was an aircraft manufacturing company in Germany.
In 1935, Dr. Adolf Rohrbach became technical director of a new Weserflug factory at Lemwerder, near Bremen, which opened in 1936. He had been working on ideas for VTOL (Vertical TakeOff and Landing) aircraft since 1933, and now developed them further.
In 1938, the company developed the Weserflug P.1003, a VTOL aircraft. It had 4 m diameter propellers that swivelled between horizontal and vertical, and could fly up to 650 km/h. It requires very complex gearing to tilt the wings without varying the power to the propellers, and therefore was never built.
Perhaps foreseeing the end of the war, the management of Weserflug transferred in 1944 from Berlin to Hoykenkamp, 15 km west of Bremen. It took over buildings previously used by Focke Achgelis.F.-Herbert Wenz: Flughafen Tempelhof. Chronik des Berliner Werkes der "Weser" Flugzeugbau GmbH Bremen. Bau der Kriegsflugzeuge Ju 87-Stuka und Fw 190 1939-1945. Lemwerder (Stedinger Verlag) 2000. . 159 pages.
During 1940-5, Weserflug built 5215 Junkers Ju 87 Stuka planes at Tempelhof. This plant also constructed Fw 190 fighters. Forced labour was used; on 20 April 1944 2,103 of the 4,151 Tempelhof workers were foreign forced labourers.
Ju 86 aircraft were manufactured at Lemwerder.
In 1960, while retaining his other commitments to the reindustrialisation of Bremen, Janson became chairman of Weser AG. In 1961, Weserflug joined forces with Focke-Wulf - also of Bremen - and Hamburger Flugzeugbau in the Entwicklungsring Nord (ERNO) to develop rockets. Focke-Wulf and Weserflug formally merged in 1964, becoming Vereinigte Flugtechnische Werke (VFW). Janson retired as chairman of Weser AG in 1969.
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