Air Cars
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Cars that run on compressed air:
Comment by MJ - However, air is not so efficient - they are claiming 70% expansion efficiency, with compression up to 60% efficiency - so at best about ~40% efficient. If compressor is driven by a 30% fuel engine, that is about 10% overall efficiency. From the accessibility perspective, renewable char gas from coppiced permaculture plantouts appears to be more sustainable in terms of local energy production from a living ecosystem. If energy is obtained from renewables such as wind, the air engine would be a great case for the car. We should encourage them to opensource the air engine?