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The Soony is a new breed of heat engine. Not a Brayton, a Rankine, an Ericsson nor a Stirling – of these, it most closely resembles a conventional Stirling engine, which is perhaps the simplest form of engine and currently leads the market in heat engine efficiency.

Thermodynamic engineers have worked to fully utilize the known Carnot efficiency (maximum thermal energy) ever since it was first understood nearly two hundred years ago, and the Soony offers a major breakthrough.

Current leader in efficiency, the Stirling engine was invented by a Scottish minister in 1816, but the more powerful steam engines prevailed in the 19th century. As oil became available, Otto (current gasoline engine) and diesels were the 20th century engines of choice.

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