Three LTD Stirling Engines You Can Build Without a Machine Shop: An Illustrated Guide
ISBN: 1452806578
Buy on Amazon
Found in 1 comment on Hacker News
GregBuchholz · 2017-09-05 · Original thread
You can run a Stirling engine on much lower temperature differentials:

https://en.wikipedia.org/wiki/Applications_of_the_Stirling_e...

https://www.amazon.com/Three-Stirling-Engines-Without-Machin...

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