| 摘要 |
An aerodynamic or airfoil structure for a given span dimension includes a fixed spar or base portion and at least one movable portion comprising a plurality of pivotable rib elements which define a three dimensional aerodynamic structure when extended. The rib elements are hingedly mounted at one end to the fixed portion and at the other to an edge member, so as to form an internally movable parallelogram structure. When the ribs are in the compacted position, they nest against or within the fixed portion, and fold within each other. The aerodynamic or airfoil structure may be in two or more sections that are extendible spanwise through operation of an internal mechanism. Structures of this type may comprise aircraft wings, rotor blades, control surfaces, spoilers, flaps or specialized airfoil devices for atmospheric or reentry vehicles. The airfoils may have either or both trailing and leading edges that are compactible and deployable.
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