Prospectus and technical report on an early German swing wing design. Privately printed from type, looks like mimeo. 50pp text and technical calculations followed by 43 line drawing illustrations. Wrps, 8.5 x 13". A lttle difficult for me to decipher with my limited German and the unusual engineering drawings but it appears to be a swing or rotatiing bi-wing that is connected to a pivoting landing gear. Some cover chips but otherwise good.