Evo-II wing
The wing is placed 'up' into 'clean' air, ala 1969 Dodge Charger Daytona.Placing the wing in clean air provides the desired downforce with the minimum-sized wing (minimum drag).
And it is for downforce,not drag reduction.
The Ford of Cologne,Germany' bi-wing was wind tunnel tested,and patented.I believe it was good for delta -Cd 0.02.
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Photobucket album: http://s1271.photobucket.com/albums/jj622/aerohead2/
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