Fairing for a truck cab-trailer gap

1. A truck for pulling a semi-trailer, the truck comprising:

an operator cab positioned on a frame;

a fifth wheel on the frame for receiving an underside of a semi-trailer, the semi-trailer when attached defining a gap between a forward most portion of the semi-trailer and rearward most portion of the operator cab; and

a fairing having a generally planar shape supported by the frame and aft of the operator cab and forward of at least a portion of the fifth wheel, the fairing extending upwardly from the frame for contact with a semi-trailer when attached, the fairing at least partly blocking an air flow path into the gap from below the frame formed when a semi-trailer is attached.

2. The truck of claim 1 , wherein the fairing spans at least a portion of a distance between a first wheel positioned on a first side of the frame and a second wheel positioned on the opposing side of the frame.

3. The truck of claim 1 , wherein a portion of the fairing is compliant.

4. The truck of claim 1 , wherein the fairing comprises a base and an upper panel, the upper panel forming an obtuse angle with respect to the base.

5. The truck of claim 4 , wherein the upper panel is compliant.

6. The truck of claim 1 , wherein the fairing includes a base portion mounted to the truck frame and extending longitudinally along the truck frame to a position forward of the fifth wheel and a generally planar panel extending vertically upward from the frame.

7. The truck of claim 1 , wherein the fairing comprises a base and a plurality of bristles extending upwardly from the base; the bristles having an end, and at least a portion of the ends of the bristles contacting the underside of the semi-trailer when the fairing is attached to the frame.

8. A fairing for blocking air flow on a truck, the truck comprising an operator cab on a frame, a fifth wheel on the frame for receiving a semi-trailer, the semi-trailer when attached to the fifth wheel defining a gap between a forward most portion of the semi-trailer and rearward most portion of the operator cab and an airflow path into the gap from a space between a top of the frame and an underside of the semi-trailer, the fairing comprising:

a panel supported by the frame aft of the operator cab and forward of at least a portion of the fifth wheel, the panel including a generally planar portion positioned to extend vertically in the space between the top of the frame and the underside of the semi-trailer and contact the underside of the semi-trailer when attached;

wherein the panel at least party blocks the air flow path through the space into the gap.

9. The fairing of claim 8 , wherein the fairing spans at least a portion of a distance between a first wheel positioned on a side of the frame and a second wheel positioned on the opposing side of the frame.

10. The fairing of claim 8 , wherein a portion of the fairing is compliant.

11. The fairing of claim 8 , wherein the fairing comprises a base with a generally planar shape and an upper panel with a generally planar shape, the upper panel forming an obtuse angle with respect to the base.

12. The fairing of claim 11 , wherein the upper panel is compliant.

13. The fairing of claim 8 , wherein the fairing is compliant proximate to the top edge.

14. The fairing of claim 8 , wherein the fairing comprises a base and a plurality of bristles extending upwardly from the base and bristles having an end, at least a portion of the ends of the bristles contacting an underside of the semi-trailer when the semi-trailer is attached to the truck.

15. The fairing of claim 8 , wherein the fairing includes a base portion mounted to the truck frame and extending longitudinally along the truck frame to a position forward of the fifth wheel and a generally planar panel extending vertically upward from the frame.