On the airfield of La Croix Rompue (broken cross) near Amiens, the tests of the monoplane were most likely unsuccessful in spite of its hops; and Robart built a second aeroplane, this time a biplane, Le Papillon (butterfly). It was patterned on the Wright, with 2 pusher propellers driven through chains, one crossed, the Antoinette motor on the lower wing. Forward outriggers carried a single forward elevator with 2 triangular fins, again like arrowheads. A single pair of rear outriggers carried a single tailplane and long rudder underneath it. 2 main wheels with a third under the trailing edge carried the aeroplane; but in May 1909, when it was finished, it did not fly.

   (Span: 12.75 m; length: c 12 m; wing area: 50 sqm: weight: 400 kg; 50 hp Antoinette, with the same propellers as on No 1)
  
   Lacking more money, Robart had to abandon his work, but remained a locally famous balloonist for years, even many years after WWII, making a flight on every national holiday at Amiens, where he became eventually a popular drivers license examiner.