thanks cfg83
where my imagination put the traditional length of bonneville spoiler is about where the template would intersect.
i think one of the problems with the nascar style, or sloping a bonnevile type up is that, even though they fit in the template, the template is 2d while the car is 3d. so if youre not just extending part of the body back to meet it, air coming around the sides of the car causes additional drag when it hits the spoiler. i wonder if a nascar type spoiler tapered off at the sides would do better, but kinda doubt its even worth testing
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