Quote:
Originally Posted by craveman85
Has anyone tested various half tonneau lengths? Maybe also on various bed lengths? Or does half of any bed length seem to be perfect?
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In the original 1986 US Patent,GM offers a drag table showing the change in drag coefficient,from zero,to full length.
*Any coverage,of any length provides a drag reduction.
*The drag minimum occurs at 50% (half) coverage (back half).
*They tested on a C-10 1/2-ton.
*The half tonneau gave a 8% drag reduction.
*The full-tonneau gave a 5.6% reduction.
*The 1/2-tonneau with forward bulkhead had 12.8% higher drag.
*And the 1/2-tonneau cut rear lift by 30%.
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In 1988,Texas Tech investigated the tonneau and also advocated the 1/2-tonneau.
If you need numbers for various bed lengths you're on your own.