Quote:
Originally Posted by Potomac-Greg
So (logically) if a three point system halts your forward progress like a harness, then the R3 will kick in and arrest forward head motion.
I kind of doubt that a 3-point will stop forward motion nearly as much as a harness will, so perhaps the need for any head-neck system is reduced. But if the R3 doesn't work with a 3 point, then it wouldn't work with a 4, 5 or 6 point either.
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The design of a 3-point belt is intentionally to allow your upper body to fold a bit over your waist - this is how it helps prevent submarining. 4-point belts have a loop on one of the shoulder belts that designed to give in a hard forward impact, so that the same folding over occurs. HANS didn't recommend their product with 4-point harnesses for some time; Schroth now claims to have a 4-point system that's compatible with HANS.
5 and 6 point belts are designed to keep the shoulders as tight as possible against the seatback, in contrast.
Hence...I would be suspicious of the R3's efficacy with 3 (and even 4) point belts...but not with 5 or 6.
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