Also known as De-Lassus, name of its creator.

-It is a fixed radial engine with an interesting ball system that replaces the pistons and with no connecting rods.

“De-Lassus”

-When the crankshaft is rotating, the balls are introduced successively into the cylinders, acting as pistons.

-There was a more practical design like the LeRhone-De Lassus.

“LeRhone-DeLassus cross-section”

-This is the version of the bi-rotary radial engine according to the principle contributed by theoretician De-Lassus.

"De-Lassus bi-rotary principle"