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Sky Technology's Aircar

Ken Wernicke, a former Bell Helicopter Textron engineer-cum-entrepreneur, made the cover of Popular Mechanics in the 1990s for his work on his Aircar, which featured groundbreaking wing technology that made it easier to transition between flying and driving.

After building a model and sustaining many wind-tunnel tests, he shelved the project in the late 1990s. "We ran out of money, had zero investors. Perhaps I wasn't much of a salesman," he says.

NEXT: Terrafugia's Transition

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