Quote:
Originally Posted by Asanelli
what do you mean half-tonneau?
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looks like freebeard's tied up,so I'll butt in.
General Motors patented a half-tonneau in the 1980s which actually produced lower drag than a full tonneau cover.
Later,Texas Tech found that this half cover,in conjunction with a cab-wing extension of proper length and angle,could produce a drag reduction almost as significant as the GM 'aeroshell'.An 18% vs 20% drag reduction.
This combo is lighter and a lot more simple to fabricate if weather tightness and security aren't as important a priority.
A number of us here at Ecomodder have tried them and can vouch for their performance.