It was a kit like one of these: http://www.ministeam.com/acatalog/Bohm_Stirling_Engines_and_Kits.html http://www.ministeam.com/acatalog/Bohm_Stirling_Engines_an

It was a kit like one of these: http://www.ministeam.com/acatalog/Bohm_Stirling_Engines_and_Kits.html http://www.ministeam.com/acatalog/Bohm_Stirling_Engines_and_... I also tried to build one from scratch once, but only got a few parts in before I sold my lathe and mill. The kit was much easier... Also look up flame eater or vacuum engines. Pretty neat.