TA2 Gurney flap wicker clarification
#28874 from SCCA Staff · Rule change · TB 20-07 (2020-07 Fastrack)
In Appendix L TA2 Rules, clarify wording as follows:
“4.8.4.1.10.1.1: The maximum height of the wing, including end plates and wicker Gurney flap, can be
no greater than the highest point on the roof. The roof may not be altered or pushed up to increase its
height.”
“4.8.4.1.10.1.5: The wing end plates must fit within a rectangle measuring 11.00 inches long by 4.00
inches tall. All wing elements, including the wicker bill Gurney flap, must be kept within the profile of the
end plates. The endplates must be mounted parallel to the vehicle centerline, and must be
perpendicular to the ground. Endplates must be flat, with no curvature or Gurney tabs flap. “
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“4.8.4.1.10.1.6: A wicker bill (Gurney) Gurney flap may be added to the wing element. It must be a
uniform shape across the complete width of the wing. No air may pass between the wicker bill Gurney
flap and the wing. It must form a 90 degree angle with the wing surface. The size of the wicker bill
Gurney flap cannot exceed 0.50 inch high as measured from the wing surface. The thickness of thewicker Gurney flap material must be 0.625 inch.”
“4.8.4.1.10.2.4: The dog leg style Howe endplates must be used without modification. All wing
elements, including the wicker bill Gurney flap, must be kept within the profile of the end plates. The
endplates must be mounted parallel to the vehicle centerline, and must be perpendicular to the ground.
Endplates must be flat, with no curvature or Gurney tabs flap. “
“4.8.4.1.10.2.5: A wicker bill (Gurney) Gurney flap may be added to the upper wing element. It must be
a uniform shape across the complete width of the wing. No air may pass between the wicker bill Gurney
flap and the wing. It must form a 90 degree angle with the wing surface. The size of the wicker bill
Gurney flap cannot exceed 0.375 inch. The thickness of the wicker bill Gurney flap must be 0.0625
inches.”
“4.8.4.2.10.3.4: The dog leg style Howe endplates must be used without modification. All wing
elements, including the wicker bill Gurney flap, must be kept within the profile of the end plates. The
endplates must be mounted parallel to the vehicle centerline, and must be perpendicular to the ground.
Endplates must be flat, with no curvature or Gurney tabs flap. “
“4.8.4.2.10.3.5: A wicker bill (Gurney flap) Gurney flap may be added to the upper wing element. It must
be a uniform shape across the complete width of the wing, and must be kept within the profile of the
end plates. It must form a 90 degree angle with the wing surface. The size of the wicker bill Gurney flap
cannot exceed 0.375 inch high as measured from the wing surface. The thickness of the wicker Gurney
flap material must be 0.0625 inch.”