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Technology of future

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Last week, SpaceX and Tesla CEO Elon Musk announced bold plans to combine the technologies of his two biggest companies by placing rocket thrusters on future specialized models of Tesla’s Roadster. The thrusters won’t actually combust, according to Musk; instead, they will expel highly pressurized cold air, giving the Tesla an extra boost in acceleration. It’s a move the might technically work, but it also baffles industry experts and engineers: the thrusters won’t be very efficient and probably won’t be street legal.

Specifically, Musk is talking about incorporating a key piece of hardware from SpaceX’s Falcon 9 rocket — a tank known as a composite overwrapped pressure vessel, or a COPV. These bottles are made out of a thin metal liner...

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