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You would enjoy reading Dr. Heinrich Hertel's "Structure, Form, Movement" book, which looks to Nature for elegant engineering solutions.
The fastest swimming fishes (i.e., tuna, shark, etc.) have max thickness at 44.22% of length, for optimal streamlining. Otherwise, they don't get breakfast, but are breakfast. They've had, oh, ~65 million years to work on it. We do well to listen to Nature.
Nature never made a Kamm back because the tail is where the propulsion comes from. Besides, a fish tail is no fun while parking or in traffic.
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