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' cap' / 'pup'
I understand the design specification for the more gentle down slope on the 'cap.'
What stood out to me was, the more aggressive curvature on the roof of the swing-away 'pup' storage unit.
If there's a specific reason to do that, then it will be what it will be. If you can 'relax' the curvature, you'll get some additional drag reduction.
22-degrees maximum downslope on any 'roofline' is a safe bet.
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