The rule states that the main roll hoop must contain tubing of a minimum size. It does not limit the main roll hoop to only that piece of tubing (otherwise why say "contain" or have the rule at all?).
Many cars, including the Citations I've seen, the Van Diemens, and the Mygale, have main roll hoops containing materials other than tubing. I was just looking at a photo of Brandon's car, and, unless I'm mistaken, it seems to have steel sheet welded to the tubing part of the main hoop.
Those additional components are part of the main roll hoop and are included in the structural analysis considered in the "alternate" design rule. They are clearly also necessary to protect the driver and fulfill the function of a main roll hoop.
If they are part of the main roll hoop for one purpose (structure), they are part of the main roll hoop for another (the broomstick test). Very simple.
You are certainly welcome to turn this into a personal attack on me, but I'll respond to the substance of your accusations rather than reciprocate.This method of argument is the same that you have been using on this forum for years. Every time that someone disagrees with you or posts something that you don't like, you start throwing other people/manufacturers under the bus without any explanation.
I am not familiar with the Mygale or late model VD hoop, but from being around the Citation chassis I know that you are wrong about it. I really cannot even imagine what you are talking about. Given how you try to deflect blame, I am going to guess that you are wrong about the other cars as well and intentionally misunderstanding the GCR and what I posted to try to bolster your argument.
As for the front roll hoop, I didn't say anything about it and I don't know why you are bringing it up.
Rules must be applied logically and consistently. When someone tortures the interpretation of a rule to try to make one car (usually the Radon) illegal, I often respond by pointing out that applying the same interpretation would make many other cars illegal. That is not throwing anyone "under the bus," rather it is pointing out the fallacy of the argument.
For example, using your interpretation that only the actual tubing used in a roll hoop can be used to measure for compliance just so happens to make all Van Diemens illegal. They rely on a separate "nub" welded to the center of the front roll hoop to meet the front roll hoop height requirement relative to the steering wheel, and many drivers also rely on the height of that nub to pass the broomstick test.
I don't think those Van Diemens are illegal since I don't accept your interpretation, so I'm not throwing anyone "under the bus." I also don't think the Citations, Mygales, and Van Diemens have main roll hoops that are illegal. But feel free to protest all of them if you like!
I'm out.