Already in 1928 the Raab-Katzenstein RK-9 Grasmücke (Warbler) was a 2-seat biplane trainer fitted with a 3-cylinder Anzani motor that was planned as a 'Volksflugzeug'. The Etrich Sport-Taube, built in 1929 by the Etrich company, was also intended as a Volksflugzeug, but it soon faced difficulties regarding production in series and the project was given up.[6] Other early People's Aircraft projects were the Deicke ADM 11 Volksflugzeug built in 1933,[7] the Gerner G.I[8] and G.II biplanes, and the Messerschmitt M 17.[9]