It was designed to be as simple, inexpensive and cheap to run as possible to encourage more people to fly and was originally intended to compete at the September 1928 Orly International Lightplane Competition (Concourse d'avions légere) but was not completed in time.

[2][3] The PM X was powered by a 25 kW (34 hp) ABC Scorpion II flat-twin engine, mounted in the nose with its cylinder heads exposed for cooling.

The fuselage was a strikingly short, flat-sided, rectangular section structure, formed by four spruce longerons and double ply covered, with the pilot's enclosed cabin under the wing leading edge; the PM X's tapered nose gave him a good forward view.

The horizontal tail was also strongly straight-tapered, with an unbalanced one-piece elevator and mounted on the fuselage underside, clear of the bottom of the rudder.

[2][3] Its landing gear was fixed and conventional, with mainwheels on split, cranked axles mounted on a central inverted strut-pyramid from the lower fuselage longerons.

[4] In September 1929, flying from le Bourget, he began to set a series of world records for light aircraft in the under 200 kg (440 lb) empty weight 4th category.