proxlamus© Posted September 26, 2009 Share Posted September 26, 2009 Well.. I'm getting ready to start buying the materials for my half cage.. and I'm running into a slight problem... Here are the required roll cage tubing requirements : (all mild steel) Rally America - Section 5.5 - DOM - 1.75 x .095 SCCA - Section 9.4.1 (appendix G) - DOM - 1500-2500 pounds - 1.5 x .095 Over 2500 pounds - 1.5 x .120 or 1.625 x .120 or 1.75 x .095 NASA CCR - Section - 11.4.7 - DOM or ERW - Under 2000 pounds - 1.5 x .120 2001 - 3500 pounds - 1.75 x .120 NHRA - NHRA's FAQ website DOM - 1.625 x .120 Hmm.. seems like if I ever want to explore and have a fun time in any of the sanctioned events.. I should probably go with a 1.75 x .120 DOM mild steel for any event!!??! My car is not a dedicated car to any sanctioned event.. just want to have fun.. but be SAFE What are most of you guys running?! Quote Link to comment Share on other sites More sharing options...
johnc Posted September 28, 2009 Share Posted September 28, 2009 For the SCCA GCR there's no spec for a roll bar. You need to refer to the SCCA Solo2 rule set. It requires: Over 1500 lbs.-min. of 1-1/†2 o.d. x .120" wall or 1-3/4" o.d. x .095" wall Quote Link to comment Share on other sites More sharing options...
proxlamus© Posted September 29, 2009 Author Share Posted September 29, 2009 DOM Tensile Stength = 70,000 psi Diameter (in) Thickness (in) ID (in) Cross Sect. Area (in^2) Tensile Strength (lbs) Weight (lb/ft) 1.75 0.125 1.50 0.64 44,668 2.169 lb 1.75 0.095 1.56 0.49 34,575 1.596 lb 1.50 0.120 1.26 0.52 36,416 1.769 lb 1.50 0.095 1.31 0.42 29,352 1.426 lb Wow thats a big difference in weight!! Looks like roughly 40 linear feet of 1.75 x .125 will weigh about 89 pounds versus the .095 wall.. which is 63 pounds! blah Quote Link to comment Share on other sites More sharing options...
proxlamus© Posted January 20, 2012 Author Share Posted January 20, 2012 Alrighty.. I found some conflicting information. I can assume this is the difference from a roll *bar* vs roll cage rules?! SCCA - Solo II rules 2011 - Appendix C 2. The size of tubing to be used shall be determined on the basis of the weight and speed potential of the car. The following minimum sizes are required required and are based upon the weight of the car without the driver. a) Over 1500 lbs.-min. of 1-1/†2 o.d. x .120" wall or 1-3/4" o.d. x .095" wall Over 1000 lbs.-min. of 1-1/4" o.d. x .090" wall c) Under 1000 lbs.-min. of 1" o.d. x .060" wall SCCA - GCR 2011 - Appendix I2. 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 1.75 x .095 Im a bit grumpy because I just picked up my main hoop today.. which is a 1.5" x .095" tube. The plan I have is listed below. My goal was to maintain a street car and aim for Street Modified or Street (Open) in the SOLO division. It seems.. maybe I should sell my current hoop and go with a thicker tubing?! Or would I be OK running this tubing based off my plans. Main hoop, rear attachment mounts, x-style door bars, main diagonal, horizontal harness bar and dash bar. 8 points in total. NO a-pillar bars or roof bars for road use. Quote Link to comment Share on other sites More sharing options...
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