In 1925, the largest engine for aeronautical use in this country was being tested at that time. With 8 cylinders in line and pistons of 192 mm bore by 230 mm stroke.

-It gave 650 HP of power and was known by the name “Alsace”. Possibly for airships.

“Sabathé, Alsace”

-Having the crankshaft so long gave rise to breakage problems due to the length and twisting.

-The mixed or semi-Diesel cycle is known from Sabathé.

“Ciclo Sabathé”

-In the semi-diesel cycle (or Sabathé) the second stage is done in phases: the first is an explosion at a constant volume (2 to 3), aided by a spark or incandescent bulb or hot fuel.

-A second phase of combustion at constant pressure, while the piston descends (from 3 to 4). The rest of the expansion is normal, as there is no more combustion (4 to 5).

-There is no relationship - other than the name - between the inventor of the theoretical semi-diesel cycle and this engine manufacturer. Maybe it's the same. SED ordered three engines for testing in Chalais-Meudon.