
The word ‘large’ applied to Stirling engines means different things to different people. An engine having a 3 kW output would be large to those working on artificial hearts or cryocoolers for electronic applications. It would be small, negligibly so, to those interested in locomotive propulsion. Reference here to large Stirling engines can therefore only mean, in the most general way, engines of a size and capacity greater than is customary (recognizing of course that, apart from cryocoolers, there are no customary Stirling engines; all the machines known are ‘specials’ made a few at a time).
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