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The shadows of the rear tire and skirting don't align. Not trying to be argumentative and I appreciate all the input, just saying it's tough to tell from the picture.
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Shadows on the ground is what had people calling 'hoax' on the Moon landing. Compare the rear edge to the corner of the body.
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What's a 1/4 round? I get that it's a 90* radius (one-fourth of a circle) but as related to a car body, I'm at a loss. How big are we talking? Some proportion of the body's size?
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The 3D rendering of the camper shows a half-round. I said quarter because of the headlights. You could go half-round with a cut-out or recess for the headlight. The rule of thumb is 4% of gross body width, minimum, so 4 inches or less.
The cooling air is a fraction of the air moving over the body (water-pumper Vanagons do have a front radiator). The fan is to overcome internal air friction.
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I'm curious why some vans shown above do and some do not have airdams or at least they have different varieties. Anybody know?
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They're from different sources. Different strokes for different folks. As for the outer ends, ultimately you'd want an
air-curtain for the front wheelwell. Here's a rendering that is indecipherable (I had a system crash and never retraced the steps).
Sort of an anti-spat. Radiusing the edge and aircurtaining is probably nit-picking. Keep in mind that I'm speculating way beyond my direct experience.
