> http://www.keveney.com/Vstirling.html
> This has to be one of the better descriptions on how a Stirling 
> engine
> works.

More generic diagram from same site. Topology varies but all use the 
same basic cycles. The engine "chases its tail" forever. gas is moved 
hot-cold-hot, piston goes in and out, displacer moves gas in such a 
way that piston is never where it wants to be for equilibrium. Some 
similarity to a 1 gate Schmitt oscillator.

        RM
 

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