Drag-reducing nacelle

Abstract From the Canadian patent

Wing-mounted gas turbofan engine is provided with an exhaust system that reduces airflow drag during subsonic aircraft flight peration. The system reduces drag by turning the engine bypass exhaust stream away from the underside of the airplane wing to lessen its tenddency to reduce air pressure under the wing. Low pressure below the airplane wing has a detrimental effect on wing lift which in, turn, causes greater airflow drag. The exhaust system construction lessens its pressure lowering influence by first inwardly curving the exhaust system exit to turn the bypass flow away from the airplane wing; second, by determining the location of a nozzle throat within the bypass stream to control …