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All I was getting at when I brought up the 'wing' analogy was that when you make the turn from the vehicle side to the surface of the boat tail, it seems to me that it should be curved at that point, similar to the shape of a wing, to keep the air from separating at the turning point.
If the curve involved creates a little lift, which I doubt, I'm betting it's still more efficient than having a tight angled turn in that much surface area.
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