Editing Sarich orbital engine (section)

{{Short description|Type of internal combustion engine}}
{{Use dmy dates|date=February 2021}}
[[File:Orbital engine.jpg|thumb|Engine incorporating OCP (Orbital Combustion Process), on display in [[Jakarta]]]]

The '''Sarich orbital engine''' is a type of [[internal combustion engine]], invented in 1972 by [[Ralph Sarich]], an engineer from [[Perth]], [[Australia]], which features orbital rather than reciprocating motion of its central piston. It differs from the conceptually similar [[Wankel engine]] by using a generally prismatic shaped piston that orbits the axis of the engine, without rotation, rather than the rotating trilobular rotor of the Wankel.