Elan Rollbar Design For Trackday Use
Posted: Thu Oct 09, 2003 12:38 am
Planning on using 2"OD x .13"Wall DOM steel tubing for the main hoop but haven't any resources which list the midplane radius for the typical mandrel tubing bender. Anyone know that value for 2" and 1.5" tubing? Using current SCCA criteria for the rollbar strenghts in each designated direction as the baseline. The only real guess work is predicting the tearout strenghts of the typical Elan chassis bobbins and mounting points. Anyone know those values by chance?
The commercial units are a joke at the height with which they typically extend up unless you are only 5' tall. At 6'2" none of the premade units are acceptable I've determined. Anyone wearing shoulder harnesses will be in harm's way. Mine is going to extend 2 inches above my helmet or 20" above the bodywork and to accomplish this I've thought of a way to construct it so the regular hood (softtop) can be slightly modified to fit through the hoop and still be somewhat water-tight. This design is not completed and the FEA has not been done yet. Just realized how to do this in a simple way while motoring into work yesterday.
Has anyone tried these seat belts with the trick switch activated inertial mechanism for the shoulder harnesses? <a href='http://www.autotech.com/autocntrl.htm' target='_blank'>http://www.autotech.com/autocntrl.htm</a> Are they worth the extra cost?
Keith :blink:
The commercial units are a joke at the height with which they typically extend up unless you are only 5' tall. At 6'2" none of the premade units are acceptable I've determined. Anyone wearing shoulder harnesses will be in harm's way. Mine is going to extend 2 inches above my helmet or 20" above the bodywork and to accomplish this I've thought of a way to construct it so the regular hood (softtop) can be slightly modified to fit through the hoop and still be somewhat water-tight. This design is not completed and the FEA has not been done yet. Just realized how to do this in a simple way while motoring into work yesterday.
Has anyone tried these seat belts with the trick switch activated inertial mechanism for the shoulder harnesses? <a href='http://www.autotech.com/autocntrl.htm' target='_blank'>http://www.autotech.com/autocntrl.htm</a> Are they worth the extra cost?
Keith :blink: