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Your Hydraulic Engineer freind is under informed.
Thes have been here on the site in some other threads, (and I am too lazy to search right now) and the concept is proven.
The air tanks are woven carbon fibre and in the event of an accident would only rupture in a controlled manner.
As to the mileage claims...
Yet to be seen, but the math seems right. IIRC.
they work similar to an old steam engine but with many efficiency improvements.
Use the search engine here and Google to find info, and formulate YOUR own oppinion.
Schultz
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You can turn painful situations around through laughter. If you can find humor in anything - even poverty - you can survive it. Bill Cosby
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