Patent ID: 11858562
Assignee: ENERGY HORIZON LLC
Field: Transport (Mechanical engineering)
Classification: CPC B | IPC B

Claim 16:
17. A drag reduction device for use adjusting air over and around a land vehicle as the land vehicle is driven on a surface, said drag reduction device comprising:
a housing having an inner housing portion coupled adjacent to an exterior surface and a pair of side housing portions extending from said inner housing portion, said housing defining a first opening and a second opening; and
a fan assembly contained within said housing, said fan assembly comprising:
a central rotatable shaft rotatable around an axis of rotation;
a plurality of fan blades coupled to and extending radially outwardly from said central rotatable shaft;
a plurality of air foils pivotally coupled to each of said pair of side housing portions and positioned within said second opening, each one of said plurality of air foils configured to be movable to any position between and including a non-clocked position and a clocked position; and

a controller coupled to said central rotatable shaft or to said one or more air foils, or to both said central rotatable shaft and said plurality of air foils to adjust air movement through the fan assembly to maximize drag efficiency at the particular vehicle speed,
wherein each one of said plurality of air foils includes:
a curved inner surface positioned adjacent to and spaced from said plurality of fan blades;
an upper surface transitioning from one end of said curved inner surface and a lower surface transitioning from an opposing end of said curved inner surface, with said upper surface and lower surface collective terminating into an outer termination edge, and

wherein an upper surface of one of said plurality of foils is spaced from an upper surface of an adjacent one of said plurality of air foils by a gap.