of this work is the technology development of a 1300 K Stirling engine. The 650 and 1050 K engines are only stepping stones toward that objective. How much progress has been made toward enhancing the technology development of free-piston Stirling engines (FPSE) for space-power applications? A partial answer to this question can be obtained by referring to Fig. 8. Back in 1983 the 875 K RE- 1000 FPSE developed 1.5 kW/piston at a mass to power ratio of 280 kg/kWe. In 1986, the 650 K SPDE produced 12.5 kW/piston at a mass to power ratio of
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