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Frank Catt · 12-22-07, 02:43 PM

Current MSA regulations for roll bars in the UK are Cold Drawn Seamless Carbon Steel Minimum yield 350N/mm2 Minimum Dimensions 45 x 2.5mm or 50 x 2mm thick ( I understand 2008 regs may now be minimum 50mm all. This is substantially greater diameter than most refered to above, which seam to rely on 1.5 inch ( 38mm ) tube. The whole fabrication changes with these thicker/ bigger diameter materials, particularly as a diagonal brace is also now mandatory to the hoop just behind the driver. Additionally all tubes must be formed in one length, there can be no welded joints in any tube, just another difficulty.

12-22-07, 02:43 PM	#45 (permalink)
Frank Catt wealdenengineer 10 tenths Join Date: Oct 2001 Location: East Sussex, UK Posts: 1,095 Rep Power: 0	Re: Roll Cage Information for GT40 Please Current MSA regulations for roll bars in the UK are Cold Drawn Seamless Carbon Steel Minimum yield 350N/mm2 Minimum Dimensions 45 x 2.5mm or 50 x 2mm thick ( I understand 2008 regs may now be minimum 50mm all. This is substantially greater diameter than most refered to above, which seam to rely on 1.5 inch ( 38mm ) tube. The whole fabrication changes with these thicker/ bigger diameter materials, particularly as a diagonal brace is also now mandatory to the hoop just behind the driver. Additionally all tubes must be formed in one length, there can be no welded joints in any tube, just another difficulty.