-DOUG- wrote:
Ah, but what KIND of steel are you buying? I've heard LoCost builders say they don't know. I'd like to be on the track in something I KNOW is going to hold up.
I don't see mention of the chrome moly for the suspension or roll cage.
The way things are going, to call it a LoCost you'll have to use something cheaper than steel. Like, uh, wood. . . .
I think it is generally assumed that everyone is using mild steel unless otherwise stated. And what are you worried about the steel "holding up to?" Rust? Bending stresses? The frame design is based on the the strength of mild steel, so using mild steel doesn't constitute cutting a corner. From what I've heard not just here, but on other racing forums mild steel makes as good a roll cage as anything. Some say it is the best material for that application, assuming it is DOM of sufficient diameter and thickness.
From what I understand, the decision of whether or not to fab up a Chromolly cage isn't usually made because it is going to be safer, just lighter since it can be made thinner. Not a Locost option, but to each his own. Not to mention the debate of what type of normalization is needed to keep the welding from weakening it. Why go there is my question. If it was proven safter the SCCA and other organizations would likely mandate all cages be made from it. If you have an unlimited bank account and you want to maximize strength and minimize weight then Chromolly is the obvious choice, but for the average Locost builder it isn't practical or required. That's probably why you don't see it mentioned.
Oh and there already is a Seven replica made of wood, it's called a Locust.
http://en.wikipedia.org/wiki/Locust_(car)
They even have their own enthusiast website.
http://www.locust.org.uk/