sentences:  However, despite its advanced design being proven sound in wind tunnel testing, the Fw 42 failed to win a contract for development, and no examples of the type were ever built.Designed by Heinrich Focke in response to a 1929 specification issued by the Air Department of the Reichswehr, the design of the Fw 42 was based on that of Focke's earlier F 19 "Ente" (German