If it was going to rev 5-6,000 on the interstate they could just use a motorcycle engine, I'm sure this isn't the issue. As for dragging around a jail cell (iron cage) with you everywhere, if we invested more in NASA and stopped cutting their budget in half every year, (thanks W), I'm sure we could find something more liberating than steel, more practical than glass and carbon fibers, and lighter than aramids.
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