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How can I make a CO2-powered small hovercraft? Are there other cool but realtively cheap ideas to try? Answered



The problem with CO2 is the tank you need to store it: heavy steel. Also it tends to cool on expansion you you'd really need some kind of heat-exchanger too. Not a good method.

However, if you can get a solid-block of CO2 it will float on a flat surface quite well, as long as the surface is warm.