And its plastic and fiberglass construction would weight little.

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As in the prior generation, the Jaguar XJ offers a choice of naturally aspirated and supercharged V8 engines and makes extensive use of aluminum construction as a weight-saving measure.

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The similarity in construction affects more than curb weight (3, 000 pounds for the Cayman S) or torsional rigidity (up 40%).

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The finished five-pound foot was a single-piece construction, hollow (to minimize weight) and with no seams or fasteners.

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The whole construction is similar to an oil well on land, with the weight of the drilling fluid designed to contain the geological pressures deep in the ground.

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