The Potez IX was an early airliner produced in France in the 1920s, a further development of the SEA IV that Henry Potez had co-designed during the First World War.[1][2]
The design mated an entirely new fuselage to the wing and tail structures of the earlier military aircraft.[1][2][3] This fuselage was very deep, nearly filling the interplane gap, and carried within it a fully enclosed cabin with seating for four passengers.[1][2][3] The nose area was carefully streamlined[2] with curved aluminium,[4] but other aspects of the construction were conventional for the day; wooden structures skinned in plywood (the passenger cabin) or fabric (the rest of the aircraft).[5] The pilot sat in an open cockpit aft of the cabin.[2][5]
The prototype flew in 1920,[6] and was followed by around thirty production examples that differed from it in having a larger tail fin and rudder.[2] The Compagnie générale transaérienne operated Potez IXs on cross-channel air services between Paris and London.[6] The Compagnie Franco-Roumaine de Navigation Aérienne flew these[5] on routes linking Paris to Warsaw via Strasbourg and Prague, and from Paris to Budapest via Strasbourg and Vienna, later extending its services to Bucharest and Constantinople.[6] Franco-Roumaine, and its successor airline CIDNA operated the Potez IX until 1928.[1][7]
The Potez IX S, a one-off modified version with wings of larger area,[2] flew in the Grand Prix de l'Aéro Club de France in June 1921 with Gustave Douchy at the controls.[8] Douchy was disqualified in the third stage of the competition.[8]
Specifications
Potez IX 3-view Drawing from Les Ailes December 29,1921
Data from "The Paris Aero Show 1921" 22 December 1921, p.842
Coroller, Jean-Louis (September 1998). "Les premièrs avions Henry Potez (première partie)" [The First Aircraft of Henry Potez]. Avions: Toute l'aéronautique et son histoire (in French). No.66. pp.8–14. ISSN1243-8650.
Taylor, Michael J. H. (1989). Jane's Encyclopedia of Aviation. London: Studio Editions. ISBN0-7106-0710-5.
Warner, Edward P. (May 2008). "Les avions de ligne au banc d'essai en 1921" [Airlines on the Test Bench in 1921]. Le Fana de l'Aviation (in French) (462): 44–55. ISSN0757-4169.
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