3. Sometimes called R de M No 2, it was tested at Bron in November 1911. Built at the shops of lacob et Cathelin, it was covered with sky-blue fabric, and with its long fuselage resembled a shorter-legged RER It was powered initially with a 24 hp air-cooled flat twin Coudert Aerien, and later re-powered with a 70 hp radial Anzani and equipped with floats to be tested on the Lake of Paladru. There, at the end of 1911 or early in 1912, Montgolfier is said to have crashed with his mechanic "in a floatplane of his own design" from a height of 6 m.

   4. A "new Montgolfier monoplane" was reported at the end of July 1912, to be flown for the first time on 10 August 1912. It was similar to the previous machine, and may have been the same aeroplane with changes: the rectangular wings had more camber, and used wing-warping; a 3-legged pylon above the fuselage replaced the inverted V mast of No 2. Janvier earned his brevet No 1195 on this aeroplane. The machine was sometimes referred to as R & M No 3, but no markings showed on this or any of Montgolfier's other aircraft.

   (Span: c 11 m; radial engine, probably Anzani)