Engineer Nemorin-Laurent Causan was notable for his revolutionary designs, although he started in a more orthodox way, as we can see in the design of a conventional V-8.

"Causan's V-8"

-He made the inline 4-cylinder and 6-cylinder designs that are shown in the Tellier-Panhard chapter (see).

"Photograph of Nemorin-Laurent Causan"

-He studied at the famous French "Les Arts et Metiers" schools, which brought art schools together with those that currently would be called polytechnic or engineering schools.

-He made a large amount of patents to protect his inventions that he would apply to projects he would realize later.

-They include several aircraft engines that we will see below:

“Patent 402180” (PiP)

“Patent 407159” (PiP)

-In the examples that are shown here we see the influence of the Etchegoin-Causan engine: in each cylinder there are two opposing pistons with a central combustion chamber, and two coordinated crankshafts at each end.

“Patent 631587” (PiP)

-This patent offers a valveless engine as a sliding sleeve opens and closes ports at the TDC.

-In patent 435571 conventional valves are replaced by pistons.

“Patent 435571” (PiP)

“Patent 557079” (PiP)

-As the above valves are pistons, this time with more complex kinematics.

-Interestingly, the aircraft engine in patent 432899 relates to a bi-rotary radial where the engine body rotates in one direction and the crankshaft in another.

“Patent 432899” (PiP)

“Patent 615318 from 1927” (PiP)

“Patent 615318, inside cross section” (PiP)

-The latter patent -from which Junkers would make the 223 and 224 engines - are designs that are rescued by Prof. Zima. An important example is the one for the engine found in the files of the Museum of Munich.

"Causan practical vision"

“Another drawing of the previous engine”

"Causan engine system"

-Information from the Friends of Nemorin-Causan (ANC)