[2] The PM X had been designed by Pierre Mauboussin and his close collaborator Louis Peyret; it set no less than four world records and demonstrated impressive performance as both a land-based and float-equipped seaplane.

[2] This wing was equipped with Louis Peyret style double-hinged ailerons (which insured greater efficacy across all angles of flight) that covered almost the entirety of the trailing edge.

These ailerons could be actuated simultaneously in the same direction by means of a lever, thus enabling it to increase the already substantial lift of the wing as well as to adjust its fineness.

The entirety of the wing’s surface was covered with plywood of variable thickness; a special varnish was applied as a protective measure.

[4] The PM XI was outfitted with an enclosed cockpit which occupied the portion of the fuselage that was situated directly underneath the wing.

[4] Excellent external visibility was provided via the numerous windows present in the walls as well as transparent panes fitted into the ceiling of the cockpit.

[4] The PM XI was powered by a single Salmson 9 Ad nine-cylinder direct-drive radial engine, which was capable of producing up to 40 hp while at 2,000 r.p.m.

The engine was mounted on an autogenously welded steel-tubing frame that was readily removable as a result of it being attached to the forward end of the fuselage via a total of four bolts.

Furthermore, the landing gear could be easily replaced by a pair of wooden floats, which used the same fittings, to convert the PM XI into a seaplane.

He also flew it, after fitting extra tankage in the cabin, from Paris to Saigon in 10 days during December 1932, a distance of 10,500 km (6,500 mi).

[7] This aircraft is stored without wings at the Musee Castel-Mauboussin at Cuers-Pierrefeu airfield near Toulon in southern France, and can be viewed by prior permission.