In the winter of 1912-13, this barely known brand exhibited at the fourth Paris Air Show,.

"Cabeza de cilindro"

-The engine was built in Neuilly, near Paris. It gave 60 hp and was a radial engine.

-Verdet was known for his radial rotary engine. (see).

-From appendix 9: Mr. Verdet is very important in the aero engine history.

-He was an engineer of "Arts et Metiers" (School of Arts and Crafts).

-In collaboration with Boudreaux they present a double piston engine, a twin-cylinder with a special device that is based on the principle of compound steam engines with double-area pistons.

"Boudreaux-Verdet twin-cylinder experiment"

-Viewing the engine cross section, the upper part looks like a normal engine. For the larger piston, the valves are at the right bottom side where there is another spark plug as well (the q).

-This second spark plug we can also see in the drawing above.

-It seems incredible that the gases in one chamber later pass to the second chamber to start a new combustion process with the remains from before.

-It would be the case of a steam compound.

“Interesting engion cross-section”

"Better view of the mechanism"

-While the Seguin brothers opened their way with rotary radial engines called "Gnome", Mr. Louis Verdet created a workshop in Paris (Avda. Kellerman) in 1908. Around 1911 he manufactured his first rotary engine, and the following year he founded the "Societe des Moteurs Le Rhone ", in 1912.

“Verdet's first rotary engine” (Foto AAMS)