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

Claim 11:
12. A land vehicle comprising:
a trailer unit comprising a top wall and a rear wall, with said top wall and said rear wall each having a cut out portion defining a cavity; and
one or more drag reduction devices housed within said cavity with said one or more drag reduction devices configured to adjust air movement over and around the trailer unit as the land vehicle is driven on a surface at a particular vehicle speed, each one of said drag reduction devices comprising:
a housing having an inner housing portion coupled adjacent to said rear wall and a pair of side housing portions extending from said inner housing portion, said housing defining a first opening aligned with said top wall and a second opening aligned with said rear wall; 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,
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, wherein said gap between each adjacent pair of said plurality of air foils is equal or unequal such that each adjacent pair of said air foils are equally spaced or unequally spaced relative to each other adjacent pair of said air foils; 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 one or more air foils, and configured for controlling air flow through the fan assembly to maximize drag efficiency at the particular vehicle speed.