Dallara Chassis: Steel Roll-Hoop?

[BoilerIMS]

http://www.speedtv.com/articles/indycar/auto/39310/

"The roll hoop, which protects the drivers in such situations, worked as designed. The tubular steel frame roll hoop was mandated to withstand 18,000 pounds of vertical, 6,500 pounds of lateral and 15,500 pounds of horizontal loads in testing. The sanctioning body also required that the structure it was fastened to (the top of the carbon fiber tub) also would be able to withstand similar loads."

The IRL chassis has a steel roll-hoop? I was under the impression that most modern carbon chassis had a kevlar-constructed roll-hoop. Can anyone verify that the roll-hoop is steel?

[Mark in Oshawa]

http://www.speedtv.com/articles/indycar/auto/39310/

"The roll hoop, which protects the drivers in such situations, worked as designed. The tubular steel frame roll hoop was mandated to withstand 18,000 pounds of vertical, 6,500 pounds of lateral and 15,500 pounds of horizontal loads in testing. The sanctioning body also required that the structure it was fastened to (the top of the carbon fiber tub) also would be able to withstand similar loads."

The IRL chassis has a steel roll-hoop? I was under the impression that most modern carbon chassis had a kevlar-constructed roll-hoop. Can anyone verify that the roll-hoop is steel?

Steel isn't a bad idea ya know. It isn't fragile to impacts on certain angles the way Carbon can occasionally crack open like an egg. Furthermore, on safety, I think you want something that is friction proof, which Carbon fibre ISNT. If you get inverted, it is a lot harder to grind down a steel hoop than a Carbon one, which for all its strength in some applications would likely grind down....

[fan-veteran]

Yes, the roll-hoop over head is made of steel.