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A flow interrupting device may cause a flow to separate from a wingtip device at a desired angle of attack. The flow interrupting device may be coupled to a leading edge of a wingtip device where a flow disruptor may be configured to alleviate a load on the wingtip device. The flow disrupter may com

A flow interrupting device may cause a flow to separate from a wingtip device at a desired angle of attack. The flow interrupting device may be coupled to a leading edge of a wingtip device where a flow disruptor may be configured to alleviate a load on the wingtip device. The flow disrupter may comprise an edge that extends into a boundary layer at a threshold angle of attack that may disrupt the boundary layer and cause a flow to separate from the wingtip device. This separated flow may reduce stresses experienced by the wingtip device and wing during various flight conditions where a transverse flow is encountered.

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1. A boundary layer interrupting device comprising: a first edge fixedly coupleable to a leading edge of a wingtip device, the wingtip device comprising a wingtip device airfoil and a wingtip device chord, the wingtip device airfoil substantially out of plane of a wing airfoil and a wing chord, the

1. A boundary layer interrupting device comprising: a first edge fixedly coupleable to a leading edge of a wingtip device, the wingtip device comprising a wingtip device airfoil and a wingtip device chord, the wingtip device airfoil substantially out of plane of a wing airfoil and a wing chord, the wingtip device airfoil extending substantially perpendicular with respect to the plane of the wing airfoil and the wing chord; anda second edge comprising a flow disruptor configured to alleviate a load on the wingtip device, the flow disruptor comprising a disrupting edge that extends into and is contained within a stagnation region of the wingtip device at a first angle of attack of the wingtip device and protrudes from the stagnation region at a second angle of attack of the wingtip device. 2. The device of claim 1, wherein the flow disruptor comprises a sharp edge extending into a stagnation region of the wingtip device at a first angle of attack of the wingtip device and protrudes from the stagnation region at a second angle of attack of the wingtip device. 3. The device of claim 1, wherein the disrupting edge extends from the stagnation region of the wingtip device at a threshold angle of attack. 4. The device of claim 3, wherein the disrupting edge comprises an edge with a small effective radius in comparison to at least one of a length of the boundary layer interrupting device, a width of the boundary layer interrupting device, or a height of the boundary layer interrupting device. 5. The device of claim 1, wherein the wingtip device is a winglet, a spiroid, a split winglet, a fence, an endplate, or a combination thereof. 6. The device of claim 1, wherein the flow disruptor is configured to cause a flow to separate from the wingtip device when the flow is beyond a threshold angle of attack. 7. The device of claim 6, wherein the threshold angle of attack is less than ten degrees. 8. The device of claim 6, wherein the threshold angle of attack is less than five degrees. 9. A boundary layer interrupting device comprising: a first edge fixedly coupleable to a leading edge of a wingtip device, the wingtip device comprising a wingtip device airfoil and a wingtip device chord, the wingtip device airfoil substantially out of plane of a wing airfoil and a wing chord, the wingtip device is disposed at the end of a wing; anda second edge comprising a flow disruptor configured to alleviate a load on the wingtip device, the flow disruptor comprising a disrupting edge that extends into and is contained within a stagnation region of the wingtip device at a first angle of attack of the wingtip device and protrudes from the stagnation region at a second angle of attack of the wingtip device. 10. The device of claim 9, wherein the flow disruptor comprises a sharp edge extending into a stagnation region of the wingtip device at a first angle of attack of the wingtip device and protrudes from the stagnation region at a second angle of attack of the wingtip device. 11. The device of claim 9, wherein the disrupting edge extends from the stagnation region of the wingtip device at a threshold angle of attack. 12. The device of claim 11, wherein the disrupting edge comprises an edge with a small effective radius in comparison to at least one of a length of the boundary layer interrupting device, a width of the boundary layer interrupting device, or a height of the boundary layer interrupting device. 13. The device of claim 9, wherein the wingtip device is a winglet, a spiroid, a split winglet, a fence, an endplate, or a combination thereof. 14. The device of claim 9, wherein the wingtip device has a substantially vertical portion comprising the leading edge. 15. The device of claim 9, wherein the flow disruptor is configured to cause a flow to separate from the wingtip device when the flow is beyond a threshold angle of attack. 16. The device of claim 15, wherein the threshold angle of attack is less than ten degrees. 17. The device of claim 15, wherein the threshold angle of attack is less than five degrees. 18. A winglet comprising: a substantially vertical portion comprising a leading edge; anda boundary layer interrupting device coupled to a portion of the leading edge, the boundary interrupting device comprising: a first edge fixedly coupleable to a leading edge of a wingtip device, the wingtip device comprising a wingtip device airfoil and a wingtip device chord, the wingtip device airfoil substantially out of plane of a wing airfoil and a wing chord, the wingtip device is disposed at the end of a wing; anda second edge comprising a flow disruptor configured to alleviate a load on the wingtip device, the flow disruptor comprising a disrupting edge that extends into and is contained within a stagnation region of the wingtip device at a first angle of attack of the wingtip device and protrudes from the stagnation region at a second angle of attack of the wingtip device. 19. The device of claim 18, wherein the disrupting edge comprises an edge with a small effective radius in comparison to at least one of a length of the boundary layer interrupting device, a width of the boundary layer interrupting device, or a height of the boundary layer interrupting device.