In LSR we shouldn't have to worry about impacting anything (high G forces). Guardrails, Trees, big rocks other cars, ect.. Mainly worry about rolling and sliding on your roof if you have one. Your cage should be strong enough to support the weight of the car and keep the driver secure inside. Roadsters have to have bars that can withstand the extra stress of sliding friction from the track surface directly on the bars themselves. Sheet metal roofs slide nicely I've had that experience.
Don't underestimate the damage that can be sustained from impacting the ground during a flip or roll.
ours is tending to the overkill,
I couldn't find a protractor but the front hoop looks to be about 120 degrees, we just built it that way.....I was particularly concerned about the prospect of being hit by a meteorite( yes a large one) or maybe a D9 that had fallen from space.....we plated the front in figuring that if the front end all came apart that the tie rods and radius rods would be dangerous items. The firewall is 5mm, the floor forward of there is two thicknesses of it and the sides are 3mm, the top of the cage has( not completed here) a 5mm cap over the top from the two bars like a sprint car.
We also built the floor like a canoe because of the "digging in" issue.....either way up we figure it'll slide.......
Three years ago when we ran at Mangalore airport someone made the joke.."yeah, you wouldn't want to be hit by one of the little planes"...."On the contrary" I said, " If one of those hit this thing they'd be totaled, it's made like a sub".......
