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An interesting university project we conducted back in 2000, was to see if you could make a model car, drive directly forward into a wind source (industrial fan) using only the wind as a power source.
So could the car not only overcome its own drag, but utilise that drag to generate enough energy to move it forward.
People (including myself) at first were very skeptical that it would work...
...but in the end it was proven to be quite simple to achieve.
Some students made electric vehicles that did it, I made a few mechanical vehicles of which some were really quite simple in design.
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