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emergency option for when you run out of gas
Like a Sail Boat sail but engineered for a car.
Telescoping Mast that locks onto the roof or hood etc...
This image looks like this idea ...
... but I can't find any text about it, other than political speech of questionable veracity. [CraigD, Aug 27 2012]
A wind-powered battery electric car
Uses a wind turbine rather than a sail, but a POC for an emergency wind charger for a more ordinary electric car. [CraigD, Aug 27 2012]
||If there's no gas, what's going to blow the sail?
||This might work in the Midwest and Holland, but quite a few bits of your planet have these things called "hills" ...