WO1992018371A1 - Apparatus and method for motor vehicle air drag reduction using rear surface structure - Google Patents
Apparatus and method for motor vehicle air drag reduction using rear surface structure Download PDFInfo
- Publication number
- WO1992018371A1 WO1992018371A1 PCT/US1992/003000 US9203000W WO9218371A1 WO 1992018371 A1 WO1992018371 A1 WO 1992018371A1 US 9203000 W US9203000 W US 9203000W WO 9218371 A1 WO9218371 A1 WO 9218371A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- structure elements
- motor vehicle
- fabricating
- rear panel
- cavities
- Prior art date
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D35/00—Vehicle bodies characterised by streamlining
- B62D35/001—For commercial vehicles or tractor-trailer combinations, e.g. caravans
Definitions
- This invention relates generally to motor vehicles and, more particularly, to techniques for the reduction of drag by providing the motor vehicle with structure on the rear surface.
- Patent 4,284,302 issued on August 18, 1981 also to Drews, describe the use of wave shaped flutes on the surface of a generally streamlined motor vehicle, the flutes generally extending longitudinally at an angle to the direction of travel- The wave shaped flutes are located on the rear portion of the motor vehicle, a portion on which the streamline structure is continued in the described embodiment.
- U.S. Patent 4,776,535, issued on October 11, 1988 to Paterso ⁇ et al. U.S. Patent 4,789,117, issued on December 6, 1988 to Paterson et al.
- U.S. Patent 4,813,633 issued on March 21, 1989 to erle et al.
- the rear surface ' has formed therein a plurality of cavity structures.
- the cavity structures are circular in shape with limited extension into the rear surface, ' however, other cavity structures can be used.
- protruding structures extending from .the rear surface, can be used to provide drag reduction.
- the plurality of structures can be implemented to permit convenient access into the interior of the motor vehicle and will not complicate the operation of the doors.
- Figure 1 is a perspective view of the rear surface of a tractor-trailer or van type motor e icle indicating the structure fabricated therewith.
- Figure 2 shows a portion of the -rear surface of a motor vehicle of the present invention wherein the structure fabricated therewith is implemented using circular cavities.
- Figure 3 shows a portion of the rear surface of a motor vehicle of the present invention wherein the structure fabricated therewith is implemented using triangular cavities.
- Figure 4 shows a portion of the rear surface of a motor vehicle of the present ⁇ invention wherein the structure fabricated therewith is implemented using rectangular cavities.
- Figure 5 shows a portion of the rear surface of a motor vehicle of the present invention wherein, the structure fabricated therewith is implemented using circular projections. DESCRIPTION OF THE PREFERRED EMBODIMENT 1. Detailed Description of the Figures
- FIG. 1 the rear panel or door surface of a motor vehicle having a rear surface capable of advantageously using the present invention is shown.
- the rear portion 10 of a tractor- railer or a van has a rear surface 11 with which the structure of the present invention is associated.
- Section 12 of the rear surface 11 is shown enlarged in Fig. 2.
- the rear surface structure includes a multiplicity of cavities 21 (in Fig. 2) having a circular geometry.
- the circular cavities can have a wide range of dimensions. In the preferred embodimen , the radius of the opening of the cavity can be between 6 inches and 18 inches with the depth of the cavity being only a few inches. The foregoing dimensions are provided for illustration purposes and cavities having dimensions exceeding the exemplary dimensions can be used to provide drag reduction.
- the dotted line 15 indicates where, when the rear surface of the motor vehicle is enclosed by doors, the doors meet when closed.
- the arrows 15A and 15B indicate the motion of the doors as they are opened.
- the rear panel can be raised by sliding the rear panel under the roof of the motor vehicle as indicated by arrow 14.
- FIG. 3 another configuration for the rear panel motor vehicle structure is shown.
- the structure is comprised of a multiplicity of triangular shaped cavities 31.
- the base length of the triangle can be 18 inches in length while the sides of the triangle can be 12 inches in length.
- the depth of the triangles is typically a few inches.
- the reduction in drag as a result of this configuration of cavities can be achieved for a large range of dimensions.
- the cavities 41 implementing the present invention are configured in the shape of rectangles.
- the linear dimensions of the rectangles are in the general range of 1 foot in length and a similar dimension in width.
- the depth of the cavity is generally a fe ⁇ w inches.
- the elements are comprised of protruding elements.
- the protruding elements are circular and can have roughly the same dimensions as the circular cavities with the exception that the height dimension is approximately equal to the depth dimension of the cavities, but extends in the opposite direction from the rear surface.
- the circular configuration for the protruding structures can be replaced by geometries, inter alia, simila to he cavity structures of Fig. 3 and Fig. 4. In general, it has been found that the protruding structures are not as effective as the cavity structures. 2. Operation of the Preferred Embodiment
- the use of the multiplicity of structures have been found to reduce appreciably the ra experienced by the motor vehicle apparently due to turbulence at the rear of the motor vehicle. While the effect of the differences of the structure geometry is hard to quantify, general comments can be made.
- the structure elements typically have linear dimensions which can be approximately 1 foot in the plane of the rear panel. This general dimension permits a multiplicity of structure elements along each edge of the rear panel. The depth or height of the structure elements have a dimension in the range of a -few inches.
- several structure elements should be as close as practical to the edge of the panel.
- the structure elements positioned on the interior of the rear panel are still effective to provide drag reduction.
- the surface of the rear panel should be coplanar with the rear edges of the sides of the motor vehicle.
Abstract
In order to increase energy efficiency by reducing the drag experienced by tractor-trailers, vans, or similar motor vehicles, structure is incorporated in the rear surface or panel (11) of the motor vehicle. The structure is implemented with a multiplicity of cavities (21, 31, 41) or a multiplicity of protruding regions (51). The cavities or protruding regions each comprise only a small portion of the total area of the rear surface and the depth or extension dimension, relative to the rear surface or panel, is small. The rear surface structure permits convenient access to the interior of the vehicle and can be incorporated in either a rear door assembly or in a sliding rear panel assembly.
Description
APPARATUS -AND METHOD FOR MOTOR VEHICLE AIR DRAG REDUCTION USING REAR SURFACE STRUCTURE
BACKGROUND OF THE INVENTION 1. Field of the Invention
This invention relates generally to motor vehicles and, more particularly, to techniques for the reduction of drag by providing the motor vehicle with structure on the rear surface. 2. Description of the Related Art
In the related art, the use of structure associated with rear motor vehicle surfaces has .been described. U.S. Patent 4,702,509, issued on October 27, 1987 to Elliott, Sr. , describes, inter alia, an inflatable balloon bag member associated with a rear of a tractor-trailer which provides for a streamlining of the vehicle region. The collapsibility of the streamlining member permits convenient storage when access to the rear of the motor vehicle is required and at low vehicle speeds when the streamlining is no longer required. U.S. Patent 4,180,290, issued on December 25, 1979 to Drews, and U.S. Patent 4,284,302, issued on August 18, 1981 also to Drews, describe the use of wave shaped flutes on the surface of a generally streamlined motor vehicle, the flutes generally extending longitudinally at an angle to the direction
of travel- The wave shaped flutes are located on the rear portion of the motor vehicle, a portion on which the streamline structure is continued in the described embodiment. U.S. Patent 4,776,535, issued on October 11, 1988 to Patersoπ et al.; U.S. Patent 4,789,117, issued on December 6, 1988 to Paterson et al.; and U.S. Patent 4,813,633 issued on March 21, 1989 to erle et al. describe a wave-like structure in the sides and top of the -rear of a tractor-trailer and in the trailing edge of an airfoil which results in reduced drag. U.S. Patent 2,800,291, issued on July 23, 1957 to Stephens, and U.S. Patent 2,899,150, issued on August 11, 1959 to Ellis, Jr., describe structure in an airfoil which prevents turbulence. U.S. Patent 4,861,093, issued on August 29, 1989 to Chapman, describes a structure in the rear surface of a motor vehicle which minimizes turbulence along the rear surface by permitting a flow of air "through" the rear surface. Russian Patent 927,616, issued May 15, 1982, and U.S. Patent 4,682,808, issued on July 28, 1987 to Bilanin, describe the panel configurations suitable for mounting on the rear of a tractor-trailer which result in the reduction of drag. The flat panels can be positioned along the rear surface for convenient storage when not required.
The structures described by the foregoing
references, those references which are applicable to tractor-trailers or other motor vehicles having a large and generally flat rear surface, are generally so large in extent that they must be stored when access to the interior of "the motor vehicle is required. These structures also can provide and appreciable contribution to the overall length of the motor vehicle.
A need has therefore been felt for a structure associated with the rear surface of a motor vehicle,
• such as a van or tractor-trailer, which can provide drag reduction while still permitting convenient access to the interior of the vehicle and without requiring storage of the structure during such access.
FEATURES OF THE INVENTION It is a object of the present invention to provide an improved motor vehicle.
It is a feature of the present invention to provide a motor vehicle with structure which results in drag reduction.
It is another feature of the present invention to provide structure on the rear surface of a motor vehicle which results in drag reduction. It is a more particular feature of the present invention to provide structure on the rear surface of a tractor-trailer which results in drag reduction.
SUM.-ARY OF THE INVENTION The aforementioned and other feature are attained, according to the present invention, by providing the rear panel or door surface of a motor vehicle with structure that results in the reduction of drag for the vehicle. In the preferred embodiment, the rear surface 'has formed therein a plurality of cavity structures. According to one implementation, the cavity structures are circular in shape with limited extension into the rear surface, ' however, other cavity structures can be used. In addition, protruding structures, extending from .the rear surface, can be used to provide drag reduction. The plurality of structures can be implemented to permit convenient access into the interior of the motor vehicle and will not complicate the operation of the doors.
These and other features of the invention will be understood upon reading of the following description along with the drawings.
BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a perspective view of the rear surface of a tractor-trailer or van type motor e icle indicating the structure fabricated therewith.
Figure 2 shows a portion of the -rear surface of a motor vehicle of the present invention wherein the
structure fabricated therewith is implemented using circular cavities.
Figure 3 shows a portion of the rear surface of a motor vehicle of the present invention wherein the structure fabricated therewith is implemented using triangular cavities.
Figure 4 shows a portion of the rear surface of a motor vehicle of the present^ invention wherein the structure fabricated therewith is implemented using rectangular cavities.
Figure 5 shows a portion of the rear surface of a motor vehicle of the present invention wherein, the structure fabricated therewith is implemented using circular projections. DESCRIPTION OF THE PREFERRED EMBODIMENT 1. Detailed Description of the Figures
Referring no to Fig. 1 , the rear panel or door surface of a motor vehicle having a rear surface capable of advantageously using the present invention is shown. The rear portion 10 of a tractor- railer or a van has a rear surface 11 with which the structure of the present invention is associated.
Section 12 of the rear surface 11 is shown enlarged in Fig. 2. The rear surface structure includes a multiplicity of cavities 21 (in Fig. 2) having a circular geometry. The circular cavities can have a wide range of dimensions. In the preferred
embodimen , the radius of the opening of the cavity can be between 6 inches and 18 inches with the depth of the cavity being only a few inches. The foregoing dimensions are provided for illustration purposes and cavities having dimensions exceeding the exemplary dimensions can be used to provide drag reduction.
Referring once again to Fig. 1, the dotted line 15 indicates where, when the rear surface of the motor vehicle is enclosed by doors, the doors meet when closed. The arrows 15A and 15B indicate the motion of the doors as they are opened. For many van type and tractor-trailer type motor vehicles,, the rear panel can be raised by sliding the rear panel under the roof of the motor vehicle as indicated by arrow 14.
Referring to Fig. 3, another configuration for the rear panel motor vehicle structure is shown. The structure is comprised of a multiplicity of triangular shaped cavities 31. In the preferred embodiment of this configuration, the base length of the triangle can be 18 inches in length while the sides of the triangle can be 12 inches in length. The depth of the triangles is typically a few inches. However, the reduction in drag as a result of this configuration of cavities can be achieved for a large range of dimensions.
Referring to Fig. 4, the cavities 41
implementing the present invention are configured in the shape of rectangles. The linear dimensions of the rectangles are in the general range of 1 foot in length and a similar dimension in width. The depth of the cavity is generally a fe^w inches.
Referring to Fig. 5, a different type of structure for the van or tractor-trailer type rear panel is shown. In particular, instead of cavity elements in the rear panel- structure, the elements are comprised of protruding elements. In this embodiment, the protruding elements are circular and can have roughly the same dimensions as the circular cavities with the exception that the height dimension is approximately equal to the depth dimension of the cavities, but extends in the opposite direction from the rear surface. As will be clear, the circular configuration for the protruding structures can be replaced by geometries, inter alia, simila to he cavity structures of Fig. 3 and Fig. 4. In general, it has been found that the protruding structures are not as effective as the cavity structures. 2. Operation of the Preferred Embodiment
The use of the multiplicity of structures, whether cavity structures or protruding structures, have been found to reduce appreciably the ra experienced by the motor vehicle apparently due to turbulence at the rear of the motor vehicle. While
the effect of the differences of the structure geometry is hard to quantify, general comments can be made. The structure elements typically have linear dimensions which can be approximately 1 foot in the plane of the rear panel. This general dimension permits a multiplicity of structure elements along each edge of the rear panel. The depth or height of the structure elements have a dimension in the range of a -few inches. In addition, several structure elements should be as close as practical to the edge of the panel. In addition, the structure elements positioned on the interior of the rear panel are still effective to provide drag reduction. The surface of the rear panel, to the extent possible, should be coplanar with the rear edges of the sides of the motor vehicle.
The* relatively shallow depth of the cavity structures or the relatively low height of the protruding structures permits the structure to be incorporated directl in the rear panel. As indicated by the references, prior art structures typically had to be moved in order to permit access to the interior of the motor vehicle. In the present invention, even the sliding panel type door whose motion is indicated in Fig. 1 by arrow 14 can be relatively conveniently accommodated because of the relatively narrow depth (or height) of the structure
array .
The foregoing description is included to r illustrate the operation of the preferred embodiment and is not meant to limit the scope of the invention. The scope of the invention is to be limited only by the following claims. From the foregoing description, many variations will be apparent to those skilled in the art that would yet be encompassed by the spirit and scope of the invention.
Claims
1. A method for reducing drag for a motor vehicle such as a van or a tractor-trailer, said method comprising the step of: providing a rear panel of said motor vehicle with a multiplicity of structure elements, each edge of said rear panel having selected structure elements positioned proximate thereto, wherein said structure elements extending a few inches from a plane of said rear panel.
2. The .method of claim 1 wherein said providing step includes a step of fabricating said structure elements as cavities in said rear plane.
3. The method of claim 1 wherein said providing step includes a step of fabricating said structure elements as projections from said rear plane.
4. The method of claim 2 wherein said providing step includes a step of fabricating said structure elements with a circular geometry.
5. The method of Claim 2 wherein sai-d providing step includes a step of fabricating said structure elements with a triangular geometry.
6. The method of claim 2 wherein said providing step includes a step of fabricating said structure elements with a generally rectangular geometry.
7. Apparatus for providing drag reduction for a motor vehicle such as a van, tractor-trailer, or the like; said motor vehicle- including a rear panel assembly, said apparatus comprising: a multiplicity of structure elements forming a part of said assembly, wherein a first multiplicity of said structure elements are positioned proximate a first side of said assembly, a second multiplicity of said structure elements being positioned proximate a second side of said assembly, a third multiplicity of said structure elements being positioned roximate a third side of said assembly, said structure elements extending into or extending from a surface of said rear panel by less than 7 inches.
8. The apparatus of claim 7 wherein said structure elements have dimensions in the plane of the rear assembly of between 6 and 18 inches.
9. The apparatus of claim 8 wherein said structure elements include circular cavities.
10. The apparatus of claim 8 wherein said structure elements include triangular cavities.
11. The apparatus of claim 8 wherein said structure elements include rectangular cavities.
12. The apparatus of claim 8 wherein said structure elements include circular projections.
13. A method for reducing drag of a motor vehicle such as a tractor-trailer or a van, said me.thod comprising the steps of: distributing structure elements ' on a rear panel of said motor vehicle, said structure elements having a dimension perpendicular to said rear panel of less than six inches; and positioning multiplicities of said structure elements proximate at least three sides of said rear panel.
14. The method for reducing drag of claim 13 further comprising a step of: fabricating said structure elements with dimensions between 6 inches and 1-8 inches for dimensions parallel to said rear panel.
15. The method -for reducing drag of claim 14 wherein said fabricating step includes a step -of fabricating said structural elements to have cavities with a circular geometry.
16. The method .for reducing drag of claim 14 wherein said fabricating step includes a step of fabricating said structural elements to have projections with a circular geometry.
' 17. The method for reducing drag of claim 14 wherein said fabricating step includes a step, of fabricating said structural elements to have cavities with geometries selected from a group consisting of a triangular geometry and a rectangular geometry.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US07/687,172 US5108145A (en) | 1991-04-18 | 1991-04-18 | Apparatus and method for motor vehicle air drag reduction using rear surface structure |
US687,172 | 1991-04-18 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1992018371A1 true WO1992018371A1 (en) | 1992-10-29 |
Family
ID=24759385
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1992/003000 WO1992018371A1 (en) | 1991-04-18 | 1992-04-10 | Apparatus and method for motor vehicle air drag reduction using rear surface structure |
Country Status (3)
Country | Link |
---|---|
US (1) | US5108145A (en) |
AU (1) | AU1912292A (en) |
WO (1) | WO1992018371A1 (en) |
Families Citing this family (25)
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ES2064261B1 (en) * | 1993-02-25 | 1998-07-16 | Doria Iriarte Jose Javier | IMPROVED FUSELAGE IN ORDER TO ACHIEVE STABILIZATION EFFECTS OF TORBELLINOS. |
WO1994022274A1 (en) * | 1993-03-23 | 1994-09-29 | Joseph Francis Hayes | Acoustic reflector |
US6092861A (en) * | 1999-07-26 | 2000-07-25 | Whelan; William | Air drag reduction unit for vehicles |
US6286894B1 (en) | 1999-08-10 | 2001-09-11 | D. James Kingham | Reduced-drag trailer |
US6276636B1 (en) | 2000-01-14 | 2001-08-21 | Norman W. Krastel | Gas or fluid de-organizers for moving objects |
US6561575B2 (en) | 2001-08-23 | 2003-05-13 | Vacuum Breaker Mile Maker | Air channeler for reducing wind resistance and method of use |
US7192077B1 (en) * | 2002-05-28 | 2007-03-20 | Hilleman Terry B | Vehicle drag reduction with air scoop vortex impeller and trailing edge surface texture treatment |
US7059662B1 (en) * | 2003-12-09 | 2006-06-13 | Drews Hilbert F P | Post pressurizing material treatment for bodies moving through fluid |
US7644977B2 (en) | 2004-12-06 | 2010-01-12 | Drews Hilbert F P | Post pressurizing material treatment for bodies moving through fluid |
US7357442B1 (en) | 2004-12-06 | 2008-04-15 | Drews Hilbert F P | Post pressurizing material treatment for bodies moving through fluid |
US7243980B2 (en) * | 2005-08-03 | 2007-07-17 | Philip Vala | Vehicle drag reduction apparatus |
US7618086B2 (en) | 2005-12-01 | 2009-11-17 | Thomas Scott Breidenbach | Aerodynamic drag reducing apparatus |
US8100461B2 (en) | 2007-05-17 | 2012-01-24 | Advanced Transit Dynamics, Inc. | Rear-mounted aerodynamic structure for truck cargo bodies |
US8360509B2 (en) | 2007-05-17 | 2013-01-29 | Advanced Transit Dynamics, Inc. | Rear-mounted aerodynamic structure for truck cargo bodies |
US8196996B1 (en) | 2008-02-11 | 2012-06-12 | Robert Campbell | Vehicle drag reducer |
US20100090496A1 (en) * | 2008-10-09 | 2010-04-15 | James Carlson | Vehicle drag reduction method and apparatus |
US8402242B2 (en) | 2009-07-29 | 2013-03-19 | International Business Machines Corporation | Write-erase endurance lifetime of memory storage devices |
US8414064B2 (en) | 2011-04-14 | 2013-04-09 | Lonnie Litchfield | Apparatus for reducing drag on a vehicle |
US9440689B1 (en) | 2011-09-20 | 2016-09-13 | Stemco Lp | Aerodynamic structures secured to the underbody of cargo bodies |
US20130076064A1 (en) | 2011-09-20 | 2013-03-28 | Advanced Transit Dynamics, Inc. | Rear-mounted retractable aerodynamic structure for cargo bodies |
CA2853727A1 (en) | 2011-10-27 | 2013-05-02 | Advanced Transit Dynamics, Inc. | Rear-mounted aerodynamic structures for cargo bodies |
US9145177B2 (en) | 2012-07-11 | 2015-09-29 | Advanced Transit Dynamics, Inc. | Retractable aerodynamic structures for cargo bodies and methods of controlling positioning of the same |
ES2529513B2 (en) * | 2013-07-19 | 2015-12-29 | Universidad de Córdoba | REDUCING DEVICE OF AERODYNAMIC RESISTANCE IN VEHICLES |
US9199675B2 (en) | 2013-12-12 | 2015-12-01 | Megan Elizabeth Miller | Corner coupled vortex structures, trailers, and vehicles including the same |
US11912347B2 (en) | 2020-11-24 | 2024-02-27 | Fore Transit Inc. | System and method for reducing aerodynamic drag for ground vehicles |
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US1903823A (en) * | 1928-12-28 | 1933-04-18 | Lougheed Victor | Aerodynamic surface |
GB453086A (en) * | 1935-11-23 | 1936-09-04 | Peter Maurice Staunton | Improvements in motor cars |
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US2899150A (en) * | 1959-08-11 | Bound vortex skin | ||
US4180290A (en) * | 1975-11-13 | 1979-12-25 | Drews Hilbert F P | Propelled apparatus having surface means for developing increased propulsion efficiencies |
US4284302A (en) * | 1979-06-11 | 1981-08-18 | Drews Hilbert F P | Driven craft having surface means for increasing propulsion efficiencies |
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US4813633A (en) * | 1986-12-29 | 1989-03-21 | United Technologies Corporation | Airfoil trailing edge |
US4861093A (en) * | 1987-11-13 | 1989-08-29 | Chapman Fred L | Tailgate assembly |
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-
1991
- 1991-04-18 US US07/687,172 patent/US5108145A/en not_active Expired - Fee Related
-
1992
- 1992-04-10 AU AU19122/92A patent/AU1912292A/en not_active Abandoned
- 1992-04-10 WO PCT/US1992/003000 patent/WO1992018371A1/en active Application Filing
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US2899150A (en) * | 1959-08-11 | Bound vortex skin | ||
US1903823A (en) * | 1928-12-28 | 1933-04-18 | Lougheed Victor | Aerodynamic surface |
GB453086A (en) * | 1935-11-23 | 1936-09-04 | Peter Maurice Staunton | Improvements in motor cars |
US2800291A (en) * | 1950-10-24 | 1957-07-23 | Stephens Arthur Veryan | Solid boundary surface for contact with a relatively moving fluid medium |
US4180290A (en) * | 1975-11-13 | 1979-12-25 | Drews Hilbert F P | Propelled apparatus having surface means for developing increased propulsion efficiencies |
US4284302A (en) * | 1979-06-11 | 1981-08-18 | Drews Hilbert F P | Driven craft having surface means for increasing propulsion efficiencies |
US4960283A (en) * | 1983-10-24 | 1990-10-02 | Acushnet Company | Multiple dimple golf ball |
US4682808A (en) * | 1985-07-24 | 1987-07-28 | Bilanin Alan J | Vehicle drag reducer |
US4702509A (en) * | 1986-05-27 | 1987-10-27 | Elliott Sr Morris C | Long-haul vehicle streamline apparatus |
US4813633A (en) * | 1986-12-29 | 1989-03-21 | United Technologies Corporation | Airfoil trailing edge |
US4861093A (en) * | 1987-11-13 | 1989-08-29 | Chapman Fred L | Tailgate assembly |
Also Published As
Publication number | Publication date |
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US5108145A (en) | 1992-04-28 |
AU1912292A (en) | 1992-11-17 |
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