AERO- OR HYDRODYNAMIC VARIABLE-CURVATURE SURFACE Russian patent published in 2001 - IPC

FIELD: aviation; water transport; wind-power plants. SUBSTANCE: variable-curvature surface includes deflectable part with drive and lifting part. Deflectable part is located along lifting part and is fastened with it by means of flexible section of skin and at least two hinge units made in form of four-link articulations spaced over span of surface. Each articulation includes member of deflectable part of surface and member of lifting part of surface articulated by intermediate members. Axles of intermediate members connecting the centers of respective articulations of four-link unit in its deflectable and lifting parts are located at acute angle relative to each other; vertex of this angle is located on flexible section of skin over entire range of operational shifts of deflectable part of surface. Relationship of linear sizes of four-link members and location of their articulations are determined on the condition of constant length of bend of skin section within range of operational angles of turn of deflectable part of surface in each cross-section between hinge-units from point of termination of skin flexible section in lifting part of surface as far as termination of this section in deflectable part of surface. EFFECT: enhanced efficiency of wing aerodynamics; possibility of ensuring variable curvature over wing span reduced mass; possibility of using this drive at insignificant height of wing profile. 5 cl, 8 dwg