Quote:
Originally Posted by oldtamiyaphile
I think the bulged section is actually a trapezoid with straight sides....
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Agreed
Quote:
Originally Posted by oldtamiyaphile
...and the curved appearance is just perspective....
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Disagree. Cut a flat trapezoid and push its two longer sides toward each other (while keeping them flat against a surface like the front of a trailer) and the shorter sides will curve. That curve is the aerodynamic benefit.