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A single loft line on a side view is a long, long way from three-dimensional reality.
Compare the Lotus to the pentamaran boat. If the outer fence were thickened into a wheel spat, that would correspond to the shrouded propellers. F1 cars have similar refined underbodies with tunnels and vortex generators. [citation needed]
An highly evolved underbody could give as much benefit without adding [much] length.