The prototype I'm working on right now uses focused sun light like you were suggesting and a scroll engine to harness the pressure caused by heating the water. What I'm trying to find is a method of having the moving parts be able to be made using local materials. The predominant available...
I am trying to design a low cost solar/steam engine for deployment where clean water and electricity are scarce. The prototyping I am currently doing is being done using plywood and a CNC router (mainly because that is what I have at my disposal). This will almost certainty not work as an end...