Not Ranked
Doug,
Here is a excerpt from the SCCA General Comp rules.
GCR - 144
ROLL CAGES
These general specifications are for all automobiles. Roll cages are
required in all automobiles.
Roll cages may be of two (2) designs, low front hoop (top of steering wheel) or high front hoop (top of windshield). Specific installations are subject to approval by the Technical and Safety Inspectors at each event.
The Technical Staff of Club Racing shall have the responsibility to ensure specification compliance with SCCA safety standards. To that end, the Technical Staff of Club Racing may or may not accept alternate construction standards from any source that significantly vary from SCCA standards of protection.
18.1. BASIC DESIGN CONSIDERATIONS
1. The basic purpose of the roll cage is to protect the driver if the car turns over, runs into an obstacle such as a guardrail or catch fence, or is struck by another car. It shall be designed to withstand compression forces from the weight of the car coming down on the rollover structure and to take fore/aft and lateral loads resulting from the car skidding along on its rollover structure.
2. A system of head restraint to prevent whiplash and rebound, and also to prevent the driver’s head from striking the underside of the main hoop shall be installed on all vehicles. Racing seats with integral headrests shall also meet this requirement and have a support to the main hoop. FIA homologated seats need not have seat back attached to roll structure if seat manufacturer
recommends, within their mounting instructions, that seat back
remain unattached to roll structure. Competitors shall have
manufacturer recommendation in writing. The head restraint on
non-integral seats shall have a minimum area of thirty-six (36)
square inches and be padded with a non-resilient material such as Ethafoam® or Ensolite® or other similar material with a minimum thickness of one (1) inch. The head restraint shall be capable of withstanding a force of two-hundred (200) lbs., in a rearward direction. The head restraint support shall be such that it continues rearward or upward from the top edge in a way that the driver’s helmet can not hook over the pad. The padded surface shall touch the helmet; it shall not be under fiberglass or other hard material. 3. Forward braces and portions of the main hoop subject to contact by the driver’s helmet (as seated normally and restrained by seat belt/shoulder harness) shall be padded with non-resilient material such as Ethafoam or Ensolite or other similar material with a minimum thickness of one-half (1/2) inch.
4. No portion of the safety roll cage shall have an aerodynamic effect by creating a vertical thrust.
5. Roll cage or chassis design shall prevent engine intrusion into the driver compartment.
6. Material:
A. Seamless, or DOM (Drawn Over Mandrel) mild steel tubing
(SAE 1010, 1020, 1025) or equivalent, or alloy steel tubing
(SAE, 4130) shall be used for all roll cage structures. Proof
of use of alloy steel is the responsibility of the entrant.
B. Minimum tubing sizes (all Formula, Sports Racing, GT, and
Production Category automobiles, and all automobiles
registered prior to June 1, 1994) for all required roll cage
elements (All dimensions in inches):
Vehicle Weight Material
Without Driver Mild Steel Alloy Steel
Up to 1500 lbs. 1.375 x .095 1.375 x .080
1500-2500 lbs. 1.50 x .095 1.375 x .095
Over 2500 lbs. 1.50 x .120 1.50 x .095
1.625 x .120
or 1.75 x .095
C. Minimum tubing sizes for (all Showroom Stock, Touring and
Improved Touring Category automobiles registered after June
1, 1994) for all required roll cage elements (All dimensions in
inches):
Up to 1500 lbs 1.375 x .095 DOM / Seamless / Alloy
1501-2200 lbs 1.500 x .095 DOM / Seamless / Alloy
or 1.500 x .120 ERW
2201-3000 lbs 1.500 x .120 DOM / Seamless / Alloy
1.625 x .120 DOM / Seamless / Alloy
1.750 x .095 DOM / Seamless / Alloy
or 1.750 x .120 ERW
Hope this helps, I can send you the entire text and DWG's from the GCR if you would like.
Just send me a email with your needs and I can forward.
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