Even if you understand how it works there is still magic in this small, beautiful, and incredibly efficient Stirling engine. It is driven by the difference in temperature between the top and bottom of the transparent base. The mechanics of the model motor are so sensitively designed that they work with minimal energy input. The warmth of a human hand from below or sunlight from above are sufficient to keep the flywheel going. A clever triangular joint connects the two engine pistons and pleases the ears with its gentle metallic clicking. This Stirling engine is also called a coffee engine because when placed on a warm (not hot!) cup of coffee it transforms its warmth into motion. Any other mild heat sources such as an Internet router or the warm light of a table lamp are also suitable. The engine also works with a source of coldness, such as a cup filled with ice cubes.
This engine is a construction by German mechanical engineer Hermann Böhm who has been passionately dedicated to Stirling technology for 40 years.
In principle, a Stirling engine works by means of two pistons which are located in cylinders of different temperatures and connected to the flywheel. Air can flow back and forth between the cylinders. In the colder cylinder, the air contracts and sucks the piston inwards. As a result, the piston pushes the cold air over into the warm cylinder where it heats up, expands, and pushes the warm piston outwards. Together they move the flywheel which will now turn over its vertex and reverse the kinetic energy. With its momentum, the flywheel pushes the warm piston back into the warm cylinder and pulls the cold piston out of the cold cylinder. As a result, the air flows back from the warm cylinder into the cold one. It contracts - and the cycle begins again.
It is therefore an absolute hit not only for collectors but also for lovers of technology!
Base Measurements: 92 mm diameter
Flywheel: 82 mm diameter
Overall Height: 120 mm
Materials: Stainless steel connecting rods and bearings, aluminum, brass flywheel
This engine comes either fully assembled or delivered as a kit in individual parts. The kit for self-assembly is recommended for adults with manual skills, a steady hand, and about 90 minutes of time.
**Cup not included**