what I don't understand is why we don't use air hybrids... now not those crappy french cars that only have an "air" motor... but simply use air tanks to get regen energy.
Think about it, you don't have to have two tanks for a reservoir, no fluid, and less weight. Sure its less efficient... but its all give and take (weight and cost vs efficiency). We could use scuba tanks (3000psi) for an extremely high energy storage.
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