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A Krueger, or leading edge flap, deployable from a lower aerodynamic surface of an aircraft main wing element so as to form a slot between the Krueger and the main wing element when deployed, the deployed Krueger having a leading edge, a trailing edge and upper and lower aerodynamic surfaces extendi

A Krueger, or leading edge flap, deployable from a lower aerodynamic surface of an aircraft main wing element so as to form a slot between the Krueger and the main wing element when deployed, the deployed Krueger having a leading edge, a trailing edge and upper and lower aerodynamic surfaces extending between the leading edge and the trailing edge, and a flow deflector which provides an effectively divergent flap profile thickness in the downstream direction at or adjacent the Krueger trailing edge so as to direct airflow away from the lower aerodynamic surface of the deployed Krueger towards an upper aerodynamic surface of the main wing element. Also, aircraft wing assembly including a main wing element and the Krueger.

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1. A Krueger, or leading edge flap, deployable from a lower aerodynamic surface of an aircraft main wing element so as to form a slot between the Krueger and the main wing element when deployed, the deployed Krueger having a leading edge, a trailing edge and upper and lower aerodynamic surfaces exte

1. A Krueger, or leading edge flap, deployable from a lower aerodynamic surface of an aircraft main wing element so as to form a slot between the Krueger and the main wing element when deployed, the deployed Krueger having a leading edge, a trailing edge and upper and lower aerodynamic surfaces extending between the leading edge and the trailing edge, and a flow deflector fixedly attached to or integrally formed with the Krueger, said flow deflector provides an effectively divergent flap profile thickness in the downstream direction at or adjacent the Krueger trailing edge so as to direct airflow away from the lower aerodynamic surface of the deployed Krueger towards an upper aerodynamic surface of the main wing element wherein a point on the flow deflector corresponding to a maximum height of the flow deflector is in a facing relation to a leading edge of the main wing element in said deployed Krueger position. 2. A Krueger according to claim 1, wherein the flow deflector is fixed with respect to the Krueger trailing edge. 3. A Krueger according to claim 1, wherein the Krueger trailing edge is flexible. 4. A Krueger according to claim 1, wherein the flow deflector is formed as a profiled surface of the Krueger lower aerodynamic surface. 5. A Krueger according to claim 4, wherein the upper and lower Krueger aerodynamic surfaces are divergent in the downstream direction at or adjacent the Krueger trailing edge. 6. A Krueger according to claim 1, wherein the flow deflector is formed as a profiled component attached to the Krueger lower aerodynamic surface at or adjacent the Krueger trailing edge. 7. A Krueger according to claim 6, wherein the flow deflector is detachable. 8. A Krueger according to claim 1, wherein the flow deflector is formed as a tab projecting downwardly from the Krueger lower aerodynamic surface at or adjacent the Krueger trailing edge. 9. A Krueger according to claim 1, wherein the flow deflector provides a profile thickness for the Krueger at or adjacent the Krueger trailing edge that is greater than the Krueger profile thickness forward of the flow deflector. 10. A Krueger according to claim 1, wherein the flow deflector has a varying thickness or shape across the span. 11. A Krueger according to claim 1, wherein the flow deflector is discontinuous across the span. 12. A Krueger according to claim 1, wherein the flow deflector has a sawtooth and/or castellated profile adapted to generate vortical flow into a mixing region between the main wing element boundary layer and the freestream flow. 13. An aircraft wing assembly including a main wing element and a Krueger in accordance with claim 1. 14. An aircraft wing according to claim 13, wherein the deployed Krueger provides an insect shield for the main wing element. 15. An aircraft wing according to claim 13, wherein a slot, which opens up between the Krueger and the main wing element when the Krueger is deployed, is convergent forward of flow deflector. 16. An aircraft wing according to claim 15, wherein the flow deflector reduces, or eliminates, divergence of the slot at or adjacent the Krueger trailing edge. 17. An aircraft wing according to claim 13, wherein the entire Krueger including the flow deflector is stowed within a profile of the main wing element when the Krueger is retracted.