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Old 12-13-2010, 04:42 PM   #33 (permalink)
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full tonneau

Originally Posted by BamZipPow View Post
How would a full tonneau and cab wing/ducktail perform?
I never tested a full tonneau so I can't share anything empirical.
My gut feeling is that it must be an improvement as the length of the wing provides some pressure regain before separation ( good!) and also 'tailors' the wake behind the cab,perhaps a benefit to the locked-vortex circulating above the cover.
When Gilkison had the T-100 he ran the 1/2-tonneau with cab wing and registered the numbers as promised by Texas Techs R&D.The full cover might cost some efficiency but you would have complete security and weather protection for all your gear,so maybe not such a penalty in the bigger picture.
P.S. The back portion of an aeroshell attached to a half-tonneau was tested by us for good effect.If memory serves me,we picked up 8% mpg HWY all by itself ( no wing ).I have photos of this and will post when I can.
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