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A transition section forms a continuous contour across a gap between a pair of structures. The transition section comprises at least one rib mounted within the gap and being pivotable relative to the structures. A tip may be mounted to an aft end of the rib and may be rotatable about a tip axis. A s

A transition section forms a continuous contour across a gap between a pair of structures. The transition section comprises at least one rib mounted within the gap and being pivotable relative to the structures. A tip may be mounted to an aft end of the rib and may be rotatable about a tip axis. A skin panel may extend between the structures and may at least partially cover the tip. The skin panel may be deformable during pivoting of the rib such that the tip may rotate into substantial alignment with the skin panel.

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1. A transition section forming a continuous contour across a gap between a pair of structures which in use are subject to fluid flow, comprising: at least one rib mounted within the gap and being pivotable relative to the structures;a tip mounted to an end of the rib which is rotatable about a long

1. A transition section forming a continuous contour across a gap between a pair of structures which in use are subject to fluid flow, comprising: at least one rib mounted within the gap and being pivotable relative to the structures;a tip mounted to an end of the rib which is rotatable about a longitudinal axis of the rib; anda skin at least partially covering the tip and at least one structure, and being deformable during pivoting of the rib; the tip rotates about the longitudinal rib axis into substantial alignment with the skin in response to pivoting of the rib. 2. The transition section of claim 1 wherein the tip comprises: an aft tip mounted to an aft end of the rib; ora forward tip mounted to a forward end of the rib. 3. The transition section of claim 1 wherein: the at least one rib comprises a plurality of ribs. 4. The transition section of claim 3 further comprising: a rib torquing mechanism for incrementally pivoting the ribs during relative deflection of the pair of structures. 5. The transition section of claim 4 wherein: The rib torquing mechanism incrementally pivots the rib such that the skin immediately adjacent to one of the structures of the pair at an interface between the transition section and the structure has a substantially continuous surface. 6. The transition section of claim 4 wherein: the rib torquing mechanism comprises a torque rod extending between the pair of structures and being coupled to at least one of the ribs. 7. The transition section of claim 1 wherein the pair of structures comprise: a pair of movable structures; ora movable structure and a fixed structure. 8. An aircraft, comprising: a transition section forming a continuous contour across a gap between a pair of structures, the transition section including:at least one rib mounted within the gap is pivotable in response to a relative deflection of the pair of structures;a tip mounted to an end of the rib which is rotatable about a longitudinal axis of the rib; and a skin at least partially covering the tip and being deformable during pivoting of the rib; the tip rotates about the longitudinal rib axis into substantial alignment with the skin in response to pivoting of the rib. 9. The aircraft of claim 8 wherein the transition section includes: a plurality of the ribs; anda rib torquing mechanism for incrementally pivoting the ribs during relative deflection of the pair of structures. 10. The aircraft of claim 9 wherein: the rib torquing mechanism comprises a torque rod which extends between the pair of structures and is coupled to at least one of the ribs. 11. The aircraft of claim 8 wherein the pair of structures comprise: a pair of movable structures; ora movable structure and a fixed structure. 12. The aircraft of claim 11 wherein: the fixed structure comprises:a wing, a fuselage, a vertical stabilizer, or a horizontal stabilizer;the movable structure or pair of movable structures comprise:an aileron, a spoiler, a trailing edge flap, a leading edge slat, a rudder, an elevator, an elevon, a trim tab, a canard, a propeller, a rotor blade, or a control tab. 13. A method of controlling airflow, comprising the steps of: installing a transition section between a pair of structures, the transition section including at least one pivotable rib having a tip mounted to an end of the rib, the tip being at least partially covered by a skin;deflecting the pair of structures relative to one another;pivoting the at least one pivotable rib during relative deflection of the pair of structures;deforming the skin elastically during pivoting of the rib; androtating the tip about a longitudinal axis of the rib into substantial alignment with the skin during deformation of the skin in response to pivoting of the rib. 14. The method of claim 13 wherein the step of pivoting the rib comprises: pivoting the rib with a rib torquing mechanism. 15. The method of claim 14 wherein the transition section includes a plurality of pivotable ribs coupled to the rib torquing mechanism; and the step of pivoting the at least one pivotable rib comprises pivoting the ribs incrementally. 16. The method of claim 15 wherein at least one of the pair of structures includes a structure surface, the step of pivoting the ribs incrementally comprises: pivoting the ribs such that the skin immediately adjacent one of the structures of the pair at an interface between the rib and the structure has a substantially continuous surface. 17. The method of claim 16 wherein the rib torquing mechanism comprises a torque rod extending between the pair of structures and is coupled to the ribs, the step of pivoting the ribs incrementally comprises: twisting the torque rod relative to a rib pivot axis. 18. The method of claim 17 wherein the step of twisting the torque rod comprises: restraining the torque rod against lateral movement relative to at least one of the pair of structures at a rod-structure junction. 19. The method of claim 17 wherein the step of twisting the torque rod comprises: sliding the torque rod axially relative to at least one of the pair of structures. 20. A method of forming a transition section subject to fluid flow in use, comprising the steps of: installing at least one rib between a movable structure and at least one of a fixed structure or an additional movable structure;mounting the rib such that the rib is pivotable about a rib pivot axis;mounting a tip to an end of the rib such that the tip is rotatable about ft longitudinal axis of the rib;and covering at least a portion of the tip with a skin such that the tip rotates into substantial alignment with the skin in response to a relative deflection between the moving structure and the fixed or the additional movable structure. 21. The method of claim 20 wherein the steps of installing and mounting the rib comprise: installing a plurality of the ribs such that the ribs are pivotable about the rib pivot axis. 22. The method of claim 21 further comprising the step of: coupling a rib torquing mechanism to the ribs in a manner causing the ribs to incrementally pivot during relative deflection between the moving structure and the fixed or the additional movable structure. 23. The method of claim 22 wherein the step of mounting the ribs comprises: mounting the ribs such that the skin immediately adjacent to one of the structures of the pair at an interface between the rib and the structure has a substantially continuous surface. 24. The method of claim 22 wherein the step of coupling a rib torquing mechanism to the ribs comprises: extending a torque rod between the movable structure and the fixed or the additional movable structure; and coupling the torque rod to the ribs. 25. The method of claim 20 further comprising the step of: forming at least a portion of one of the rib upper and lower edges with a rounded shape such that the skin is maintained in contact with the rib at a tangent to the rounded shape during relative deflection of the moving structure and the fixed or the additional movable structure.