Abstract: An aerodynamic enclosure for a refrigerated trailer. The enclosure fits over the upper portion of the front wall of the trailer, enclosing the factory installed refrigeration unit and motor. The enclosure has an upper front opening which fits around the air opening of the refrigeration equipment. A second front opening is covered with hinged doors to provide access to the refrigeration equipment. A pair of side openings are covered by hinged doors and provide access to the refrigeration controls and equipment. A top opening provides an outlet for air from the enclosure. The enclosure is symmetrical about its vertical axis and is aerodynamically contoured to reduce wind resistance and provide substantial economies in fuel consumption. An auxiliary door may be used to cover the upper front opening of the enclosure when the refrigeration equipment is not in use.

Abstract: Aerodynamic drag reducing apparatus for mounting on the bluff, forward face of the trailing element of an over the road vehicle. The apparatus comprises a contoured member carried on the forward face and extending outwardly therefrom with its point of maximum extension substantially aligned for impingement by an air stream. The portion of the surface displaced above the point of maximum extension describes a perturbed paraboloid of revolution with the rearward portions of the apparatus describing three sides of rectangle for aerodynamic merging with the top and side edges of the trailing element.