You know, I don't think "THEORETICAL ENGINES" is the right term.
"Theoretical" implies theory is somehow associated with the engines.
The valve train design required dynamic acceleration forces that solid mechanics theory says no real mechanism could survive.
The condenser required heat exchange rates that are beyond what heat transfer theory predicts.
The bearings required the lubricating water to behave in ways that fluid mechanics theory can not explain.
The plastic piston rings require properties that materials science theory has not yet discovered.
The "regenerative Schoell cycle" is built on principles that thermodynamics theory doesn't support.
Of course, Harry Schoell's strength is that he is unencumbered by any understanding of conventional engineering theory. That gives him the freedom not to be limited by the laws of nature. For instance, he's given us the insight that power required to overcome aerodynamic drag does not increase with the third power of speed and that bearings are "tiny generators".
Nobody working within the boundaries of proven theory would ever come up with such things.
So maybe Cyclone engines would be better described as "imaginary" or "fantasy" or "make-believe" or "pretend" engines.
Or, as their former chief technical advisor would call them, "delusional" engines.
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