Orbital, non-reciprocating, internal combustion engine

A combustible fluid-operated orbital engine, comprising:

• plural sets of cooperating cylinders and piston members arranged at all times in opposed relation on a common longitudinal axis for circular and orbital motion along intersecting counter paths, wherein each of cylinders comprises a recessed portion positioned at the entry of the cylinder that contains a compression sealing system, the compression sealing system comprising a cartridge having a plurality of split compression sealing rings positioned therein configured to provide a seal on a corresponding piston member during periodic interfittment of the cylinders and their corresponding piston members;
• gearing structure operative to rotate the members counter to their the orbital motion to maintain their opposed relation for their periodic interfittment where their respective paths intersect, and
• a combustible fluid supply to the cylinder member for combustion coincident with their periodic interfittment in engine operating relation, the common longitudinal axes of the sets being at all times parallel with each other.