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An apparatus for reducing the aerodynamic drag of a bluff-bodied vehicle such as a tractor-trailer in a flowstream, the bluff-bodied vehicle of a type having a leading portion, a trailing portion connected to the leading portion, and a gap between the leading and trailing portions defining a recircu

An apparatus for reducing the aerodynamic drag of a bluff-bodied vehicle such as a tractor-trailer in a flowstream, the bluff-bodied vehicle of a type having a leading portion, a trailing portion connected to the leading portion, and a gap between the leading and trailing portions defining a recirculation zone. The apparatus is preferably a baffle assembly, such as a vertical panel, adapted to span a width of the gap between the leading and trailing portions so as to impede cross-flow through the gap, with the span of the baffle assembly automatically adjusting for variations in the gap width when the leading and trailing portions pivot relative to each other.

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We claim: 1. An apparatus for reducing the aerodynamic drag of a bluff-bodied vehicle in a flowstream, the bluff-bodied vehicle of a type having a leading portion and a trailing portion connected to the leading portion with a gap therebetween defining a recirculation zone, comprising: a baffle asse

We claim: 1. An apparatus for reducing the aerodynamic drag of a bluff-bodied vehicle in a flowstream, the bluff-bodied vehicle of a type having a leading portion and a trailing portion connected to the leading portion with a gap therebetween defining a recirculation zone, comprising: a baffle assembly adapted to span a width of the gap between the leading and trailing portions so as to impede cross-flow through the gap, the baffle assembly comprising a first vertical panel adapted to be mounted to the leading portion and a second vertical panel adapted to be mounted to the trailing portion, so that said first and second vertical panels are parallel to each other with overlapping planar sections capable of sliding in parallel relative to each other for automatically adjusting the span of the baffle assembly for variations in the gap width when the leading and trailing portions pivot relative to each other. 2. The apparatus of claim 1, wherein the first vertical panel is adapted to be mounted to a base surface of the leading portion, and the second vertical panel is adapted to be mounted to a front surface of the trailing portion facing the base surface. 3. The apparatus of claim 2, wherein the first and second vertical panels are adapted to be hinged to the base surface and front surface, respectively. 4. An aerodynamic bluff-bodied vehicle comprising: a leading portion; a trailing portion connected to the leading portion with a gap therebetween defining a recirculation zone; and a baffle assembly spanning a width of the gap between the leading and trailing portions to impede cross-flow through the gap, the baffle assembly comprising a first vertical panel mounted to the leading portion and a second vertical panel mounted to the trailing portion, said first and second vertical panels are parallel to each other with overlapping planar sections capable of sliding in parallel relative to each other for automatically adjusting the span of the baffle assembly for variations in the gap width when the leading and trailing portions pivot relative to each other. 5. The aerodynamic bluff-bodied vehicle of claim 4, wherein the first vertical panel is mounted to a base surface of the leading portion, and the second vertical panel is mounted to a front surface of the trailing portion facing the base surface. 6. The aerodynamic bluff-bodied vehicle of claim 5, wherein the first and second vertical panels are hinged to the base surface and front surface, respectively. 7. The aerodynamic bluff-bodied vehicle of claim 4, wherein the aerodynamic bluff bodied vehicle has a tractor-trailer arrangement with a tractor as the leading portion and a first trailer as the trailing portion.