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I had disappointing results with the mpg and seat of pants from the new back. I had thought the angles were wrong. Top was 15-17 and sides were 15-20. I changed to 12 top and 12 sides but the van still seems to be sluggish on coastdown. It was much better with just the short extensions. It's possible the cooler weather is affecting the results. Just how much difference is there in air density between 85F to 70F? Or could the half shell create some massive vortex, increasing drag?
Of course it could be a dragging brake or some other increased friction like a toast bearing. I guess I should take the sucker off and try it that way.
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Vortex generators are old tech. My new and improved vortex alternators are unstoppable.
"It’s easy to explain how rockets work but explaining the aerodynamics of a wing takes a rocket scientist.
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