Nano Rhombic Stirling Engine

Kontax Nano Rhombic Stirling Engine work by cyclically heating and cooling the air inside the main chamber. As the air heats up it expands, and as it cools down it contracts. This expansion and contraction drive a small power piston which in turn drives the flywheel. The clever thing about Stirling engines is that the mechanism for cycling the heating and cooling of the air is built into the engine in the form of the displacer, which is driven by the flywheel and crank arrangement and moves the air from the warm side to the cool side and back again over and over. This Kontax Nano Rhombic Stirling Engine has been in my display cabinet for a long time and has never been used. It's still brand new. I'm planning to downsize my collection of Stirling engines. Thank you for looking.