Abstract: Micromorphologically crack-free vitreous carbon articles having a length and width each of which is at least 10 mm, and a thickness of at least 5 mm are described, as well as multilayer laminates of micromorphologically crack-free vitreous carbon, and corresponding methods and apparatus for manufacture of same. 3D printed vitreous carbon articles are also described, together with 3D printing apparatus and methods for producing same. Methods are also described for forming vitreous carbon containing vitreous carbon nanolattice articles therein as filler. The vitreous carbon compositions, articles, and laminates of the disclosure overcome the thickness limitations of conventional vitreous carbon manufacturing methods and the microcracking issues attendant previous efforts to produce vitreous carbon of substantial size and thickness.

Abstract: A drag reducing device utilizing sealed aft cavities designed to limit interference with existing truck and trailer designs is described. The invention comprises one or more sealed aft cavities affixed to the rear of a traditional commercial straight truck or trailer, or any other blunt (or mostly blunt) aft faced vehicle. A capability is provided by which the device is stowed to allow normal operation of the straight truck, trailer or vehicle. Drag is reduced by the streamlining of the rear of the vehicle, postponing and narrowing the flow separation downstream of the trailing edge as well as increasing the pressure on the back of the vehicle with the open to the rear, sealed aft cavity. The concept described focuses on the utilization of sealed aft cavities) to limit the effects of blunt body drag and the means for attachment and stowage for loading and unloading cargo.

Abstract: A drag reducing device utilizing sealed aft cavities designed to limit interference with existing truck and trailer designs is described. The invention comprises one or more sealed aft cavities affixed to the rear of a traditional commercial straight truck or trailer, or any other blunt (or mostly blunt) aft faced vehicle. A means is provided by which the device is stowed to allow normal operation of the straight truck, trailer or vehicle. Drag is reduced by the streamlining of the rear of the vehicle, postponing and narrowing the flow separation downstream of the trailing edge as well as increasing the pressure on the back of the vehicle with the open to the rear, sealed aft cavity. The concept described focuses on the utilization of (a) sealed aft cavity(ies) to limit the effects of blunt body drag and the means for attachment and stowage for loading and unloading cargo.

Abstract: A drag reducing device utilizing sealed aft cavities designed to limit interference with existing truck and trailer designs is described. The invention comprises one or more sealed aft cavities affixed to the rear of a traditional commercial straight truck or trailer, or any other blunt (or mostly blunt) aft faced vehicle. A means is provided by which the device is stowed to allow normal operation of the straight truck, trailer or vehicle. Drag is reduced by the streamlining of the rear of the vehicle, postponing and narrowing the flow separation downstream of the trailing edge as well as increasing the pressure on the back of the vehicle with the open to the rear, sealed aft cavity. The concept described focuses on the utilization of (a) sealed aft cavity(ies) to limit the effects of blunt body drag and the means for attachment and stowage for loading and unloading cargo.

Abstract: A drag reducing device utilizing sealed aft cavities designed to limit interference with existing truck and trailer designs is described. The invention comprises one or more sealed aft cavities affixed to the rear of a traditional commercial straight truck or trailer, or any other blunt (or mostly blunt) aft faced vehicle. A means is provided by which the device is stowed to allow normal operation of the straight truck, trailer or vehicle. Drag is reduced by the streamlining of the rear of the vehicle, postponing and narrowing the flow separation downstream of the trailing edge as well as increasing the pressure on the back of the vehicle with the open to the rear, sealed aft cavity. The concept described focuses on the utilization of (a) sealed aft cavity(ies) to limit the effects of blunt body drag and the means for attachment and stowage for loading and unloading cargo.

Abstract: A drag reducing device utilizing sealed aft cavities designed to limit interference with existing truck and trailer designs is described. The invention comprises one or more sealed aft cavities affixed to the rear of a traditional commercial straight truck or trailer, or any other blunt (or mostly blunt) aft faced vehicle. A means is provided by which the device is stowed to allow normal operation of the straight truck, trailer or vehicle. Drag is reduced by the streamlining of the rear of the vehicle, postponing and narrowing the flow separation downstream of the trailing edge as well as increasing the pressure on the back of the vehicle with the open to the rear, sealed aft cavity. The concept described focuses on the utilization of (a) sealed aft cavity(ies) to limit the effects of blunt body drag and the means for attachment and stowage for loading and unloading cargo.