2 Lap belts have been widely accepted by most motorsports sanctioning bodies worldwide. If you look at Formula One, NASCAR, IndyCar, Grand AM, ALMS, and almost any professional series you will find a large percentage of the drivers using 2 lap belts. This trend has grown as well in Club Racing for Porsche, BMW, SCCA, and even for track day enthusiasts. To understand why 2 webbing is different than 3 webbing, one needs to look at the shape of the human body. The Iliac Crest is the part of the pelvic bone that sticks out above the hips. 2 webbing (pictured in black), fits entirely within that crest where 3 webbing (pictured in red). rides over the tips of the crest The 3 webbing has less surface area by percentage than the 2 webbing, this results in more potential bruising with 3 webbing on impact as hot-spots of force develop where the belt is making contact with the pelvic bone. Since the 2 webbing rides inside the crest it can be worn as much as 1 to 2 tighter and at the same time is more comfortable. It is also less likely to slide up above the crest and cause submarining – a condition where the body slides down below the lap belt possibly causing internal organ damage. Research shows that the faster the pelvis is captured, the lower the resultant loads on the chest, head, and neck. There is no difference in the strength of the 2 webbing. All webbing (2 or 3) must meet the same load tests. Additional features of the 2 lap belt is that the adjusters are easier to work and there are generally fewer interference issues with the lap belt openings in race shell seats.
Posted on: Mon, 05 May 2014 02:09:22 +0000
Recently Viewed Topics
© 2015