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gascort: I know these plastic bags to be water tight, but their potential downfall would be that they are super cheap and super light. I think within 1000 miles they would need replaced simply due to wind related ware, not to mention the sun they would have to endure.
diesel john: Very true... I will have to look into doing a water drop test on the car. I have done it for the windshield, and it goes to almost horizontal at the lower corners. I placed the tip at that point, but it may not be optimal. Since the passenger's side is still stock I may have to look at it on that side.
trebuchet03: I actually read about something like this once. A guy that makes carbon fiber mirrors that have a great leading edge and a partial boat-tail. The boat tail doesn't restrict sight but isn't clear, it's just a start. The leading edge reduces the drag on them by 30%, and the start on the back by another 25%. If I was to make some out of fiberglass I would try to do the same, start a boat tail. If I can come across a good, cheap, clear plastic to work with, I may just build a full boat tail on them to see if there is an improvement.
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