[Ant]

Starting to look at my IRS and building a new subframe and A Arms.

The Certification people here require a plan with tubes sizes etc so we can go through the design phase and get approval before construction. They specify a minimum size e.g. a lower rear A Arm is 7/8" diameter tube with a wall thickness of 5/32" for generally speaking a heavy weight sportscar.

I am thinking of using 4130 tube 1-1/4" diameter x 0.080" WT for the lower wishbones and would like to compare the strength to their minimum specifications. There must be a calculator or for people like me that aren't that good at Mathematics a formula to calculate.

Feed back appreciated.