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compressed
There's a professor across the street that toyed with one but he used an air motor,much like an impact wrench might use.The power supply was liquid nitrogen,run through an expansion device to gasify it under relatively high (to the atmosphere) pressure.It was very loud,had very limited range,was expensive to fuel and I believe the whole project has been abandoned.Seems like when the whole energy path was analyzed,the system had terrifically low mechanical efficiency.----------- I personally think that an air motor device,recharged slowly between traffic lights(if we must have them),could assist a small engine or electric motor,acting like a supercharger or turbo,only for acceleration,then taken off line after the car achieved cruise.There would be an issue with mass and I think it may be the reason for electric hybrid,because of the highest efficiencies demonstrated with electric and electronic devices.
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