In the past few years, we have covered plenty of amazing Stirling Engines here. This 8-Cylinder Solar Stirling Engine takes it to the next level. Designed by CarlAero engineers, this engine can run on the heat from your hand. It also runs in reverse when cooled.
This solar Stirling engine has a 4-inch diameter base. It stands 5.5″ tall. The bad news? Something like this doesn’t come cheap.