4 and or expander 6 having a rotor core and a jacket and the eccentricity of the jacket mounted on said rotor core is given by e u2266 1 u2212 c 3 where c is the ratio between the radius c of the core and the radius r of the jacket c c r the operation of the heat engine is as follows fluid is introduced see arrow a into the lrrcc 4 is compressed therein and passed through the combustion chamber 20 where it is heated to the expander 6 the heated residual fluid expelled from the output 26 of the expander is optionally passed through the heat exchanger 16 advantageously utilized to heat the output fluid of the lrrcc 4 before entering the combustion chamber 20 for further heating as can be seen in fig2 while useful work obtained by conventional gas turbines is represented by the area w the useful work obtained by utilizing the heat engine according to the present invention is w w referring to fig3 there is depicted a cross sectional representation schematically showing an actual arrangement of a multi stage heat engine 2 seen is a first stage lrrcc 4 and a second stage lrrcc 4 u2032 coupled to the first stage and a heat exchanger 30 cooling the lrrcc.