Abstract: A rear for passenger automobiles of the type having a pivotal hatch inserted in a rear opening of a vehicle body and extending in a smooth flowing line toward the rear and including a window in a transversely extending lower frame adjoining the window, is provided, in accordance with the preferred embodiment of the invention, with an aerodynamic device on the lower frame of the hatch, the aerodynamic device having sections extended laterally from the hatch along lateral body parts of the vehicle. The laterally extended sections should preferably merge into and terminate at the lateral body parts. Additionally, in hatches where frames are provided extending in the longitudinal direction of the vehicle, ribs are provided extending away from the aerodynamic device, running along the frames, and forming an aerodynamic unit with the aerodynamic device.

Abstract: An aerodynamic drag-reducing shield for mounting on the front of a trailer or truck box, has a front surface contour defined by a series of semi-ellipses, the minor axes of the ellipses tapering off towards the upper rear edge of the shield at such rate that in profile the shield has a part-elliptical leading edge.

Abstract: An improved ventilation system for automobiles and the like which have windows which can be rolled down or similarly adjusted, comprising an energy saving insert assembly for capture between a rolled down window and the window frame above it; the insert assembly including an external scoop for forcing air into the automobile and an internal orientable nozzle for adjustably directing the forced air; special configuration adjusts the system to compensate for speed of the automobile, and makes one design fit either side of the automobile.