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The 'tank' has much more frontal area than I'm hoping for but I will try and taper the edges to prevent votice formation, but it's a compromise between having maximum solar area and aero. If I can keep the frontal area really small, the slab sides hopefully wont be too much of an issue.
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If you take the shape of the Bugatti, only above that swage line 10" above the ground, and the diameter of the wheel w/o the tire, it's a pretty close match to your plan—given that the wheelbase is 18" less and the track is 10" less than the VW.
The plan taper is less than what would be helpful; but the real problem is the 90° edge between the top and sides. Theory wants a minimum radius 4% of the gross width. With your 86" panels, that adds 7".
