High Quality Content by WIKIPEDIA articles! The Dufaux 4 was an experimental aircraft built in Switzerland in 1909 and which was originally constructed as an un-named biplane, the third aircraft constructed by the brothers Armand and Henri Dufaux. The aircraft was entirely conventional for the era - a two-bay biplane with unstaggered wings of equal span and a triangular-section fuselage. Construction began in mid-September 1909 and work proceeded rapidly, as the brothers hoped to claim a CHF 1,000 prize put up by the Automobile Club de Suisse for the first Swiss-built aircraft to fly a 1 km closed-circuit.

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