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Old 03-11-2018, 12:24 AM   #48 (permalink)
freebeard
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Well, there is — harness crosswinds.



You can drive into the wind with a propeller but it's an impractical proposition:


https://www.wired.com/2012/07/wind-powered-car-upwind/

How would you propose to do that with internal ducting in a road-going vehicle?
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