I was simply amazed by the videos of vacuum engine i checked recently in youtube. Here the engine is heated from outside (external combustion engine) and expands the air inside allowing the pistion to move. Though I am not a technical person who can explain this process in detail, I was wondering about the possibility of this engine in future. Currently a flame is heating the engine, but think of future, what if this can be substituted by solar energy. Imagine a car with a huge lens mounted on top and the lens refracts the sun rays to point on the engine... pure solar energy, No fuel :) LOL!!! (see my diagram below)
Following are the youtube videos which caught my attention:
hmmm!!
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