초록 ▼

An apparatus for shielding a blade against lightning includes a conducting component forming a leading edge glove and a conducting cover, for protecting the blade tip across its entire chord. Mechanical devices, such as screws and rivets with protruding shapes, in addition to some gluing, fix the co

An apparatus for shielding a blade against lightning includes a conducting component forming a leading edge glove and a conducting cover, for protecting the blade tip across its entire chord. Mechanical devices, such as screws and rivets with protruding shapes, in addition to some gluing, fix the cover on the composite structure of the blade, and are earthed by the cover, forming points where lightening can enter or exit, protecting the surrounding composite structure of the blade against damage. At least the cover may have a suction face arm and a pressure face arm of different dimensions at least in the direction of its span. When the blade is mounted on a member for linking to the hub, electrical continuity with this member and the hub is provided

대표청구항 ▼

[ We claim:] [1.] A blade comprising shielding for enhanced protection against lightning for a rotorcraft rotor;said blade comprising a composite structure of composite material, synthetic matrix and reinforcing fibers, said composite structure comprising a profiled main blade section delimited betw

[ We claim:] [1.] A blade comprising shielding for enhanced protection against lightning for a rotorcraft rotor;said blade comprising a composite structure of composite material, synthetic matrix and reinforcing fibers, said composite structure comprising a profiled main blade section delimited between a section face surface and a pressure face surface which extend, in a direction of a chord of the blade, between a leading edge and a trailing edge and, in a direction of a span of the blade, between a blade tip at one end of said main blade section and a blade root which extends an opposite end of said main blade section and which includes means for attaching the blade to a rotor hub;said shielding for protection against lightning comprising:a glove for protecting the leading edge, said glove being metallic, electrically conducting, and comprising a suction face arm and a pressure face arm which are adjacent along the leading edge and which are fixed to underlying parts of the suction face surface and the pressure face surface;a cover for protecting the blade tip, said cover covering at least an end of the blade tip and being metallic, electrically conducting, and comprising a suction face arm and a pressure face arm which extend over substantially an entire end chord of the blade tip and which are applied to underlying parts of the suction face surface and the pressure face surface, respectively, in a region of the blade tip, while being connected with electrical continuity to the glove, andelectrically conducting means on the blade root for providing electrical continuity between the glove and electrically conducting means of said hub, for earthing the shielding, wherein the glove for the leading edge and the cover for the blade tip comprise a single component fixed by the cover against at least an end face of the composite structure in a region of the blade tip and fixing means which are at least in part electrically conducting, wherein said fixing means comprise mechanical means having protruding shapes, constituting predetermined points for lightning to strike or to exit, placed in electrical continuity with said cover, wherein said mechanical fixing means comprise at least one screw for effecting at least one function selected from the group consisting of balancing and closing a housing of at least one member selected from the group consisting of a balancing weight and a dynamic-adjustment weight and which is screwed into a region of said end face of the blade tip which is closer to said leading edge than to the trailing edge.