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Herr Rethel is one of the most experienced German aeroplane designers. He started work with the Condor Works and with Franz Schneider at the Luft‐Verkehrs‐Gesellschaft; became chief designer to the Condor Works during the war, one of his successes being the Con.E.III cantilever parasol fighter of 1918; designed in 1919 one of the first commercial transport aeroplanes, the Dutch N.A.V.O. high‐wing cabin monoplane; worked as chief draughts‐man with the Fokker firm during 1920–1925 on fighters, flying‐boats and seaplanes: became chief designer to the Arado Works in 1926. Since this paper was read he has taken up the post of chief draughtsman at the Messerschmitt Works.