Abstract: The sealing grid system for a rotary piston mechanism of the Wankel type comprises apex seal assemblies and a plurality of seal strips slidably disposed in recesses in at least one face of the rotary piston. Each of the recesses are formed at the juncture of the peripheral surface of the rotary piston and the surface of one of the rotary piston faces and extend to communicate with next adjacent apex seal slots. A groove is formed in the bottom of each of the recesses to receive a biasing member, V-shaped in cross-section, which functions to both urge the associated seal strip outwardly of the recess and to seal the interstices between the seal strip and its recess. Each of the seal strips is dimensioned in length to abut the next adjacent apex seal blades.

Abstract: A rotary combustion engine and method of operating said engine in which grooves are provided in the engine trochoid surface to permit any unburnt fuel at the trailing end of a working chamber of the engine to blow back into the following working chamber so as to reduce the hydrocarbons in the engine exhaust without any material adverse effect on engine performance.

Abstract: A rotary trochoidal compressor comprising a rotor mounted for planetary motion within a housing and in which the periphery of the compressor rotor is substantially a hypotrochoid and the peripheral inner surface of the housing is the outer envelope of the rotor and in which labyrinth seal means is provided between the rotor and housing.

Abstract: A composite rotor construction for a rotary engine in which the rotor gear has a self-centering spline connection to a steel sleeve having a tight fit in the rotor bore.