Patent ID: 8025329

Claim:
A collapsible airfoil for trucks and trailers comprised of: a first directionally flexible vertical panel having a inner edge and an outer edge, said inner edge being pivotally attached to a first trailer door and said outer edge being pivotally attached to a hinged component; a second directionally flexible vertical panel having an inner edge and an outer edge pivotally attached to said first vertical flexible panel by said hinged component; a third directionally flexible vertical panel having a inner edge and an outer edge, said inner edge being pivotally attached to a second trailer door and said outer edge being pivotally attached to a hinged component; a fourth directionally flexible vertical panel having an inner edge and an outer edge pivotally attached to said third vertical flexible panel by said hinged component; a first upper semi-rigid horizontal panel having an upper surface and a lower surface, said first upper semi-rigid horizontal panel pivotally attached to said first trailer door supported at in inward angle α, said angle α having a range of 15-30 degrees defined by the upper edge of the vertical doors; a second upper semi-rigid horizontal panel pivotally having an upper surface and a lower surface, said second upper semi-rigid horizontal panel attached to said second trailer door supported at in inward angle α, said angle α having a range of 15-30 degrees defined by the upper edge of the vertical doors; a first lower semi-rigid horizontal panel having an upper surface and a lower surface, said first lower semi-rigid horizontal panel pivotally attached to said first trailer door supported at an inward angle; a second lower semi-rigid horizontal panel having an upper surface and a lower surface, said second lower semi-rigid horizontal panel pivotally attached to said second trailer door supported at an inward angle; a plurality of brackets to prevent said first horizontal panel and said second horizontal panel from being blown upward; a first pull cable attached to an aperture in said outer edge of said second directionally flexible vertical panel to close panels; a second pull cable attached to an aperture in said outer edge of said fourth directionally flexible vertical panel to close panels; a first support cable attached to said upper surface of said first upper semi-rigid horizontal panel and secured to said first trailer door at an angle of 30-50 degrees; a second support cable attached to said upper surface of said second upper semi-rigid horizontal panel and secured to said second trailer door at an angle of 30-50 degrees; said first, second, third and fourth vertical panels forming a tear drop shape when engaged by said pull cables and said support cables; a central wake separating panel pivotally attached to the outer side edge of said first flexible vertical panel; and a second wake separating panel releasably attached to said first lower semi-rigid horizontal panel.