Invented by Robert Stirling in 1816 as a closed-cycle regenerative hot-air engine, the Stirling engine converts any external heat differential directly into smooth mechanical rotation. Today, precision scale Stirling kits serve as tactile demonstrations of the ideal thermodynamic cycle.
Alpha, Beta, and Gamma Configurations
In an Alpha Stirling engine, two separate power pistons sit in isolated hot and cold cylinders connected by a regenerator tube. In Beta and Gamma designs, a loose-fitting displacer shuttles gas between the heated quartz/stainless hot cap and the finned aluminum cold sink, driving the power piston without valves or exhaust explosions.