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Abstract

An expandable piston rotary engine includes a core having a substantially circular periphery and central axis, and a rotor/flywheel mounted concentrically for rotation relative to the core. The core defines a plurality of cylinders spaced symmetrically about, and open at, the periphery of the core. Each cylinder contains a radially expandable, substantially cylindrical piston formed of a relatively thin web of material, such as sapphire or amorphous steel. The piston web material is coiled about its associated cylinder axis, and defines an internal combustion chamber whose diameter, and volume, vary in response to a relative coiling and uncoiling of the web in its cylinder. The inner surface of the rotor/flywheel defines with the periphery of the core, the cylinders and the outer surfaces of the pistons a closed space for a hydraulic fluid. Intake and exhaust valves and fuel igniters are associated with each of the cylinders. The core and other engine components are formed of lightweight ceramic materials capable of withstanding very high operating temperatures. By driving the rotor shaft relative to the core, and changing the valving to the piston chambers, the engine may be converted for use as a compressor or fluid pump.

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First Claim