Quote:
Originally Posted by Snax
Just working off my own intuition myself, but I think the reason boxing it had minimal effect over the simple spoiler could be viewed in terms of area. I.e., there is a lot more potentially turbulent air coming off the top of the car vs. the sides. I think that changes as proportions shift with more vertical design areas such as with station wagons and trucks.
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I just took the whole thing off. It got wet in unexpected rain and even with black paint it warped a bit and it became hard to imagine it was working great. Nonetheless, my average to work was quite a bit lower.
I am going to rebuild and I think I will go with a fiberglass over cardboard build.