A. Top Wing Center Foil
a. Center Foil maximum size of 25 square feet with a maximum width and length of 60 inches. Center Foil must be square or rectangular in shape with all 4 corners set at 90° angles with no variance allowed. Center foil top is to be flat from front to back and side to side. The center foil top must start being flat within 6” from the center foil’s front leading edge.
b. Center Foil shall be fully sheathed in aluminum. Vent holes, dimples, ridges and/or any other type of fabricated modification will not be permitted anywhere on the wing.
c. A removable wicker bill, maximum height of 2 inches, may be mounted on the rear edge of the top wing center foil. Wicker bill must be 90 degrees to the top of the center foil. Built-in wicker bills or gurney lips will not be permitted. The maximum dimension of the wicker bill may change periodically at the discretion of World of Outlaws Officials. Any such changes will be issued in writing prior to the event in which the change will be made.
d. The top wing may be adjustable in the cockpit by the driver. Other than the slider mechanism-moving parts will not be permitted on or in the foil structure.
e. Only one slider mechanism will be permitted on the top wing, which only permits forward and backward adjustment.
f. The maximum center foil thickness is 9 inches. Underneath the side of center foil must appear to be a continuous smooth arc with no recesses, concaves, or protrusions. Center Foil must be one-piece construction. Split or bi-wings will not be permitted. Only wings fabricated of metal alloys will be permitted. Fiberglass, carbon fiber and/or other similar material(s) will not be permitted in the basic framework of the wings. The top wing must not extend beyond the outside of rear tires.
g. Foils or rudders will not be permitted anywhere on the top wing.
h. Wing T-Post will be built from 1” X .083” minimum ASTM4130 normalized steel or equivalent material. Wing attachment designs will be subject to approval. The only cast pieces approved will be HRP Part #HRP8811-A75-HD. If new T-Post designs are developed they must be submitted for approval before being used in competition. Some approved T-Post designs are in the drawings section.
B. Front Wing Center Foil
a. The center foil will have a maximum size of 6 square feet with a maximum width of 36 inches and a maximum length of 24 inches. The Center Foil must be square or rectangular in shape with all four comers set at 90-degree angles.
b. Center Foil shall be fully sheathed in aluminum. Vent holes, dimples, ridges and/or any other type of fabricated modification will not be permitted, anywhere on the wing.
c. A maximum 2” removable wicker bill may be mounted on the rear edge of the center foil. The Wicker bill must be 90 degrees to the top of the center foil. Built-in wicker bills or gurney lips will not be permitted. The maximum dimension of wicker bill may change periodically at the discretion of World of Outlaws Officials. Any such changes will be issued in writing prior to the event in which the change will be made.
d. The maximum distance from the Center Foil front edge to the front edge of the front axle may not exceed 20 inches.
e. The Center Foil front edge must remain at least 1 inch behind the front edge of the front bumper. The Center Foil top surface from side to side must remain flat.
f. The Center Foil must be one piece. Split or bi-wings will not be permitted.
g. Only wings fabricated of metal alloys will be permitted. Fiberglass, carbon fiber or other similar material(s) will not be permitted in the basic framework of the wings.
h. The Front Wing must not extend beyond the outside of front tires. The Front Wing may not be cockpit or driver adjustable while the car is stationary and/or in motion.
i. Moving parts will not be permitted on or in the foil structure. Rudders or fins will not be permitted.
j. The 5” section located at the rear of the front foil must not have a belly/curl arc that is out of proportion with the rest of the front foil. As measured on a 5-inch straight edge, the belly at 2½ inches from the rear of the foil may not be deeper than 3/8-inch with no tolerance. It is suggested that the wing blue print specify 11/32 inch depth, so that if any deflection or movement of the wing occurs, the depth will not exceed the 3/8 inch specification (This 3/8 inch measurement ensures that the belly/curl arc is gradual).
k. The belly/curl arc must span the entire length of the front foil and appear to be a gradual arc with the deepest point, not further back than 12 inches from the leading edge. The belly/curl arc must start at the front foil’s leading edge and shall not exceed a depth of 2 inches. Front foil thickness cannot exceed 3.6 inches.
C. Side Board Panels
a. All braces or supports shall be oriented thin edge to face the air stream. Only rectangular, round or oval metal braces not exceeding 1-inch in width will be permitted. Adjustable bracing will not be permitted.
b. Aero elliptical brace material will not be permitted.
c. Brace or support shall not resemble a wicker bill or a split wing. Side boards must be mounted square to the center foil and parallel to each other. Any kick-out will not be permitted.
1. The Front side boards will have a maximum 12 inches tall and 26 inches long with an overhang not exceeding 1-inch from the center foil front edge to the side board front edge.
2. Side boards may have a maximum ½”-inch front, back, top and bottom turnout(s) (flange).
1. The Top wing side board’s maximum size will be 72 inches long and 30 inches tall. The top 2/3’s of each top wing side panel shall consist of only 2 corners. Each corner shall be set at a 90° angle with no variance. This portion of the side panel’s leading edge may not be behind the center foils leading edge.
2. Panels must be of one-piece construction.
3. Panels must be fabricated flat. Turnouts on all edges of the wing must not exceed 1-1/4” x 1-1/4” and must be orientated at a 90° angle to the flat portion of the side panel.
In the event that there are new wing/foil components and/or a new wing/foil configuration they must be submitted per the World of Outlaws Sprint Car Series rule book prior to being introduced into competition for approval.