Patent ID: 8256204
Filing Date: 2012-09-04
Classification: F02K,F05D,Y02T

Abstract:
1. A power unit for providing propulsive thrust by means of a flow of gaseous fluid, the power unit comprising: an efflux duct defining a first fluid flow path along which the gaseous fluid travels for discharge from a first fluid exit opening to provide the propulsive thrust; and a thrust reversing structure which, when in a deployed position, redirects the flow of the gaseous fluid along a second fluid flow path to discharge from a second fluid exit opening to provide reverse thrust; wherein the thrust reversing structure comprises longitudinally translating cowl portions defining inner and outer surfaces extending between leading and trailing circumferential ends, wherein the translating cowl portions are moveable from a stowed position to a deployed position, wherein, when in the deployed position, the inner surfaces of the translating cowl portions adjacent to the leading circumferential ends are positioned adjacent to a core cowl surface to block a major proportion of the first fluid exit opening and to cause the gaseous fluid to efflux from the second fluid exit opening, wherein the translating cowl portions move in a generally longitudinal direction towards the deployed position along a path which is inclined to the power unit axis wherein an angle of inclination of the path with respect to a vertical plane defined by the power unit axis lies in a range from 5° to 20°.