The Britalus Engine concept under development by Combustion Research & Technology, Inc. (CR&Ti) is a gas turbine-like Brayton cycle engine whose physical characteristic is that a unique design is used for the compressor and the expander. These components achieve their function by positive displacement wherein pistons located within a rotor are forced to execute simple harmonic motion through bearing contact with an outer three-lobed cam. It is shown that this arrangement has the advantage that practical designs for engine sizes ranging from as small as 10 kw to 1000 kw with steady combustion are possible. The high compression and expansion efficiencies of these components incorporated in a simple high pressure ratio cycle allow contemplation of the design of light, rugged and efficient engines for a wide variety of applications. A realistic evaluation of a new engine requires identification and magnitude determination of the performance limiting loss mechanisms and an understanding of the means for power control. This paper is a description of the compressor and expander components, and the means used for cycle pressure variation by modification of the compressor geometry. The part-load characteristics of the engine and the impact of the requirement for part-load operation on the engine design are described.

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