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Only if you think that's how box cavities work. I don't think that - because they reduce drag even when the extensions are not angled inwards and so when there's no reduction in cross-sectional area.
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All this thinking when one could be out testing.
I
thought that angled, stepped and curved extensions were pretty much equivalent
for a given reduction in cross section.
Can anyone help? I am unable to find the [yellow] side view of Morelli's Urban Car that had it's maximum cross section at the C-pillar, with a 45% chamfer.
It speaks to my understanding before Ecomodder.
I have a big scrap of aluminum sheet and a Geo Metro. I'd be interested in an annular half-ring that clips onto the rear hatch. Suggested profile? Chamfer? Tearing edge?