Engine That Uses Ice For "Fuel"

[mklotz]

Stirling engines come in many configurations. One of the most intriguing is the Fluidyne...

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

Liquid pistons and no moving mechanical parts make for a truly ingenious design. I built one of these using glued Plexiglas parts with an embedded ceramic power resistor as the heating element. While it worked, it was hardly exciting to watch. Sadly, it no longer exists. A tragic accident involving a high speed grandchild led to its demise.