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how are they planing to get around the problem of the engines freezing up? air powered cars have been around for years but have only been sold/used in very warm areas because as you release a compressed gas it will cool the tank and the exhaust side of the engine and unless you keep it warm it will freeze up solid.
also, air compressors are horribly inefficient and have their own set of problems, just talk to someone who works in a factory that uses compressed air, or has worked on large air compressors.
The only advantage that I can see with this is that to make the energy storage you just need to build a strong enough tank, unlike a battery that needs rare metals, and the engine is just a steam engine running on air, it could be made out of almost anything, from crude to exotic.
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