"The Perfect Trap for the Engineering Mind" -- Leo Fernekes' Stirling Engine

I did a post about Leo back in August: 

https://soldersmoke.blogspot.com/2020/08/great-video-on-pc-board-techniques-with.html

Although it is not about radio, homebrewers will find much to resonate with in Leo's Stirling engine project.  

Warning:  There is a Part II.  And there may be more.  Proceed at your own risk.