https://ecomodder.com/forum/showthre...ics-20744.htmlhttp://https://ecomodder.com/forum/m...ng-results.jpgFound PhD Timothy Maxwell et al.'s paper from Texas Tech.
Full-scale, wind-averaged ( 0-degrees-to-10-degrees ) tunnel testing at Lockheed, Marrieta, Georgia revealed:
Short-bed pickup:
* 19" wing @ 8.2-degrees down angle= negative delta-Cd 4.17%
* 22" wing @ 5.0-degrees = negative delta-Cd 4.6%
* 24" wing @ 8.2-degrees = negative delta-4.73%
* The 19" wing was 'okay' up to 13-degrees
* The 22" wing was in burble point by 12.0-degrees
* The 24" wing was burbling @ 12.0-degrees
* The 24" wing was @ stall @ 18-degrees.
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The Long-Bed pickup:
* 22" wing @ 3.0-degrees= negative delta-Cd 3.64%
* 28" wing @ 5.0-degrees = negative delta-Cd 4.19%
* 32" wing @ 8.0-degrees = negative delta-Cd 4.37%
* The 22" wing was in stall @ 13.0-degrees
* The 28" wing was in stall @ 13.2-degrees
* The 32" wing was in stall @ 13.0-degrees
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The combination, cab-wing & half-tonneau maximum drag reduction was 17%.
Lift was reduced by 30%.
56% lower lift compared to a no tonneau and gate down configuration.
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here's the table ( rotated )
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here's a link to the 'blister half-tonneau', 3rd & 4th images from top