Messpa was an engine manufacturer from 1909 to 1913. Their 5-cylinder radial was known as "Helium" (see). It gave 100 CV at 1,200 rpm.

-Another engine of this brand gave 80 hp at 2,000 rpm. It was an unconventional two-cylinder engine from 1913.

-In 1909 an experimental engine was built by this brand.

-It consists of two cylinders with two opposed pistons each. One crankshaft at each cylinder end and running with the two-stroke cycle.

"Messpa opposed piston engine, schematic drawing"

-At the rear it has two flywheels that regularize the rotation of each crankshaft.

-At the front we see a transmission with bevel gears driving each crankshaft to conjugate the piston positions.