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California98Civic: Thanks for the link to your thread, seems like we were going down the same path. I'd be curious for a picture of yours. That is where the 100mm number came from.
Xist: thanks for the link, I had found a different presentation by the same person and subsequently lost it.
There is also a Brookhaven report that mentions short box cavities (although I didn't get a whole lot out of that one). The rear end extension panels on commercial vehicles seem to be much deeper (Hucho) which makes the tailgate idea sound better.
I'm thinking I may have missed the point though. Several of the box cavity examples that extend from the trailing surfaces have slanted or curved walls. The ones with straight walls are inset from the side surfaces. I wonder if that inset acts like a slanted surface to the air flow. I think maybe I'd be better off if I moved the half bed cover forward 4" and made a 15 degree sloping extension for the top wall (interferes with the utility since you wouldn't be able to open the tailgate w/o opening the cover though). The side walls having to be inset due to the tail lights could remain straight. Can't do much about the bumper on the bottom...
Sound right?
If this works, might put a box cavity behind the cab too! (although not sure how it'll interact with the half bed cover).
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