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In my younger years, my grandfather showed me a machine that he had made himself - he used to work in a weaving mill as an engine fitter. He called it a "Warmluftmaschine", i. e. a machine running with hot air, and he had made it just to try out the working principle. Unfortunately I was too young to understand how it worked, but nevertheless I enjoyed it when it was running! Later he gave it to me, and I still hold it with great admiration as a keepsake from him. Here are some photos (click to enlarge) of this one-piston air cooled Stirling machine (beta type):
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My first Stirling machine - made by my grandfather.;)
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Notes on the pictures:
- "Opa, was machsch du do?" (Grandpa, whatcha doin'?)
- General view.
The aluminum part on the right is not original - my grandpa added it so that I did not bruise my little fingers under the moving connecting rods.
Note the alcohol burner, soldered from a copper lamp cover. The machine runs for several minutes, until the somewhat small cooling fins get too hot, reducing the temperature difference. - Detail: connecting rod and piston.
The rod to the displacer runs through the middle of the power piston, which is connected to the crank shaft of the red flywheel. The 4 rods a arranged in a way that I saw nowhere else so far - one "spare hole" shows a trace of earlier experiments. - The power piston and the displacer, disassembled.
- The machine in maintenace phase, power piston and displacer removed.
- Don't miss to watch the animated gif from M. Keveney, which shows how the machine works. He has many other well done machine drawings there as well.
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