They made a small engine and insufficient to power any aircraft but with an expandable range from 3 to 5 cylinders radials, 6 cylinders in V, 2 opposed cylinders, 3 cylinder fan-shape, etc.

“Martin & Brouillet ad”

-It was presented at the X Lépine Competition within the II Salon de l'Aeronautique, and was announced as an extra-light engine.

-In fact it is an external combustion engine in case of running on steam.

-But it also works with compressed air, carbonic acid (see Serpollet and Vuia).

-And in general with any elastic fluid (as it is said verbatim).

-The proper name of the engines was: "Prima" engines.

-It seems evident that the gaseous fluid opening valve is mechanically controlled by a rod and a rocker arm.

-The simplest solution for this type of engine is the ball valve that is automatically lifted by a stud on the piston head.

“CO2 engine concept” (PiP)