The Umbrella Semi-Trailer Drag
Reducer is a device that reduces
tractor-trailer
aerodynamic drag, saving energy and reducing fuel consumption. The design includes a number of features similar to an umbrella, including flexible
skin,
metal ribs, quick-acting deployment, and compact
stowage. The Umbrella Semi-Trailer Drag
Reducer is designed to minimize installed cost, be robust and vandal resistant, and reduce the time needed for deployment to only a few seconds. The design includes two independent,
paraboloid, mirrored halves, one mounted to each door. The bottom of each mirrored half is open, with a profile similar to one quadrant of an umbrella. Wide-throw hinges accommodate the collapsed stowed drag
reducer. Turnbuckles maintain taught
skin. The design allows easy retrofit for most existing semi-trailers. The drag
reducer is mounted high above the
road surface, with no part protruding beyond the top or sides of the semi-trailer.