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Pierre Ferrand’s Corkscrew Airship
This is Pierre Ferrand de Montfermeil’s 1835 design for an airship, featuring a giant screw mechanism and an elaborate system of fins. Unfortunately details of the design are scarce, and this appears to be the only image we have. According to the authors of the book L’Aéronautique des origines à 1922, it originallt appeared in a brochure titled Projet pour le Direction de l'Aérostat par les Oppositions Utilisées, or Project for the Direction of Airships used by Oppositions.