I came across an article about this kart and I am amazed at how this works.
The kart is designed to travel downwind and is powered by the wind. But, the kart eventually reaches a point it is traveling the same speed as the wind, and it keeps going and starts traveling faster than the wind. It has been recorded going as fast as 3.5x the speed of the wind.
http://www.fasterthanthewind.org/
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Posted by Dayton