José Oller Asensio from Valencia presented his rotary piston engine clearly based on any fluid pump but working in reverse.

-It is shown here because in the chapter on exotic and rare engines it would remain in simple theory.

“Oller rotary engine”

-The information came to us incorporated with a detailed description of its operation.

-We ccan see that the ends of the blades that contact the cylinder walls do not seem very lucky.