초록 ▼

An aerofoil body, for example a “delta”wing aircraft, in which strip-form devices project rearwards from the trailing edge of the wing and serve to improve the lift-to-drag ratio of the body, in some conditions of flight at least, by modifying the formation of the trailing edge vortex to allow the a

An aerofoil body, for example a “delta”wing aircraft, in which strip-form devices project rearwards from the trailing edge of the wing and serve to improve the lift-to-drag ratio of the body, in some conditions of flight at least, by modifying the formation of the trailing edge vortex to allow the axes of the primary vortex sheets to lie closer to the fore-and-aft centerline of the body than would otherwise be the case. When the strips are basically flat in shape, the strips may project straight backwards from the trailing edge or may be angled in various ways. The use of twisted strips is also described.

대표청구항 ▼

An aerofoil body adapted in use for motion relative to a surrounding mass of fluid and presenting: a fore-and-aft centerline lying parallel to said motion; a trailing edge relative to said motion; at least one swept leading edge relative to said motion, said edge presenting a spanwise tip giving ris

An aerofoil body adapted in use for motion relative to a surrounding mass of fluid and presenting: a fore-and-aft centerline lying parallel to said motion; a trailing edge relative to said motion; at least one swept leading edge relative to said motion, said edge presenting a spanwise tip giving rise in use to a respective primary coil-form vortex sheet; a single strip-form device corresponding to each said swept leading edge, each said strip-form device being mounted on said body at a location lying directly aft of at least part of said swept leading edge and projecting rearwardly from said trailing edge at a location inboard of said spanwise tip, the projecting length of each said strip being considerably greater than their spanwise dimension, with none of said strips being oriented relative to the said fore-and-aft centerline in a sense opposite to that of the sweep of said swept leading edge with which it corresponds, and each said device being so located as to modify the said coil-form vortex sheet generated by the corresponding said swept leading edge so as to improve the lift-to-drag ratio of said body. An aerofoil body adapted in use for motion relative to a surrounding mass of fluid and presenting: a trailing edge relative to said motion; at least one swept leading edge relative to said motion; and at least one strip-form device carried by said body and projecting rearwardly from said trailing edge, said device being so oriented as to modify the vortex sheets generated by the interaction of said edges with said fluid and so to improve the lift-to-drag ratio of said body, said one strip-form device being twisted and having a free end with the hand of said twist being such that in proceeding from said attached to said free end of said device, the inboard edge of said device rises relative to the plane of the mean chord of said body.