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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In early December, flight tests commenced at a field in Corsier.
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The Dufaux 4 was an experimental aircraft built in Switzerland in 1909 and which was originally constructed as an unnamed biplane, the third aircraft constructed by the brothers Armand and Henri Dufaux.
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The brothers quickly rebuilt the machine in time to display it at an aviation meet at Colombier, but due to the inclement weather, did not attempt to fly it.
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The Dufaux brothers concluded that the field chosen was too small to give the aircraft enough room to build up speed for takeoff, so they selected a new location for their tests in Viry, in neighbouring France.
Henri Dufaux | Jean Dufaux | Dufaux 5 | Dufaux 4 |
In his newly acquired Dufaux 4 biplane, from September to October 1910 he became the instruction pilot for Armand Dufaux and Henri Dufaux.