SECTION 20: GENERAL REGULATIONS, BODY:7, 7:1 AIR FOILS (Page 32) (10/26/2015)
For all open wheel/body vehicles where rear wing is permitted, vehicle must have a rear roll-cage shroud. A multi-piece shroud is permitted. The shroud must be constructed of minimum .075-inch Grade 2 ASTM-B-265 titanium or .090-inch 4130 steel or be of NHRA-accepted composite construction and must be shaped to conform to the roll cage. The shroud must be attached to each of the side bars with a minimum of three 1/4-inch-minimum-diameter Grade 8 bolts and bosses per side, to the top with one 1/4-inch-minimum-diameter Grade 8 bolt and boss, and to the rear bars with a minimum of two 1/4-inch-minimum-diameter Grade 8 bolts and bosses per side. Tabs with bolt and nut, where the nut is welded to the tab, may be used in place of the bosses. Absolutely no components may be mounted to the helmet shroud above the top of the shoulder hoop. Bolt heads must be ½-inch hex-style head.
NHRA-accepted helmet shrouds must be made as a one-piece shroud, a two-piece shroud, where each half must overlap; or a three-piece shroud, that includes two side shields and the center section.
All shrouds must fully encapsulate the rear braces and the secondary roll-cage hoop on the sides and top; when viewed from the rear, the shroud must cover the complete visible roll-cage structure. On the bottom, the shroud must have 2-inch clearance between the upper frame rail/shoulder hoop; on the top and sides, the entire shroud must extend fully forward to at least the centerline of the side bars.
When the shroud is fabricated as a two-piece unit, the components must overlap a minimum of 3/4-inch per side.
On a three-piece shroud, the center/rear section of the shroud may stand off from/behind the side pieces by no more than ¾ inches at any point and must overlap each side a minimum of 1 1/2 inches. The side shrouds must extend to the centerline of the rear hoops.
NHRA RULE AMMENDMENTS MADE FROM THE END OF THE 2015 SEASON TO THE BEGINNING OF THE 2016 SEASON.
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