Strange but not only engine with the arrangement of opposed pistons and joined by the combustion chambers (see SPA).

"Eole opposed piston engine"

-The two crankshafts are synchronized -naturally- and thus giving output for two propellers.

-The valves are located in the central part of the engine, above and below, controlled by rocker arms.

-The engine shown in the main text does not have propellers. Now we provide a more complete illustration.

-It is a four-cylinder, opposed-piston engine with a cumbustion chamber in the center and two crankshafts at the ends. There are two pistons per cylinder.

-It is as if two four-cylinder engines were joined by the cylinder heads, with the same combustion chamber.

-In fact we see the valves and their mechanisms in the center. Something similar was done in Italy by SPA.

"Eole four-cylinder with opposed pistons, 100 CV"

-Built at the Dutheil et Chalmers factory.