was a single-seat aircraft built in Germany in the early 1930s.
It was a high-wing monoplane of all-wood construction with fabric-covered foldable wings[1] In 1931 the Deutsche Luftfahrt-Verband e.V.
(DLV) opened a competition for an inexpensive light aircraft.
Two entries were put forward; Akaflieg Berlin's B4 F.F.
Hermann Mayer's MM-1 (D-2230), with both aircraft exhibited at the 1932 Deutschen Luftsport-Ausstellung (DELA) in Berlin.