Originally posted by GoodFinder
On the subject of harness bars, an EMT posted the following dialog on the NSX boards earlier this year:
"Be aware that installation of a 4/5/6 point harness with harness bar in a vehicle without full rollover protection is not advised. In the event of a rollover, where the roofline may compress, wearing shoulder harnesses will prevent your head/neck/upper body from being able to "duck" and prevent injury. With OEM 3 point belts, when the car rolls over, the tendency is to lean forward and/or "fall out" of the shoulder harness. With a 4/5/6 point harness, your back cannot separate from the seat - thus, you can not "lean forward" to "duck" or "fall out" of the harness and your head/helmet takes all the weight."
Is he implying that one would deliberately "duck" and prevent injury? This seems unrealistic in a real crash situation. I'd more than likely try to lean backward, against the seat and AWAY from the dangerous points (namely, the joint of the A-pillar and the roof). Not that that's the correct response, I just think that's what I'd do in a crash.
Maybe that's the whole point of rollover protection
I was in my first crash this weekend co-driving at North Woods Clubrally. It was a slow plow straight off the road at a turn, we impacted at maybe 10 mph. I deliberately braced myself backward into the seat, but then, I knew I had a 5-point harness and roll cage around me. No injuries other than sore shoulders, chest, and neck (the harnesses were probably slightly looser than they should have been, and my body yanked forward about 1/2 an inch.)
At an open track day, where your car is more likely not to have rollover protection, the speeds are higher and everything happens faster. I don't know if I'd have time to react.