This paper discusses the elementary use of non-dimensional parameters for analysing the performance of a simple jet turbine engine. The coniponents of the engine—intake, compressor, combustion chamber, turbine and final nozzle—are linked together by means of the component characteristics. The possible running points are such that the characteristics are satisfied simultaneously when the whole of the engine is in equilibrium.

The components of the engine in general can be matched only at one point, called the design point. Performance af equilibrium points away from the design point may be predicted by the methods described, before the engine is built.

The paper also shows how the essential parameters governing the behaviour of the jet turbine engine are linked with the aircraft parameters.