The mass of your head is the key issue. Nobody is going to be able to
keep their neck from snapping backward in a sudden fall arrest with a
chest ring unless you are lucky enough to fall vertically, but most of
the time you are going to lose your grip and fall backward. If your
head snaps forward due to a rear attachment ring it stops when your chin
hits your chest or your head hits the tower, neither of which are as
likely to kill you as a fractured neck.
Dave AB7E
On 9/28/2011 12:30 PM, Dick Green WC1M wrote:
>
> That said, I question whether it's really true that there's a greater risk
> of injury with the chest ring. Remember that the ring is placed relatively
> high on the harness, not at belly level. It seems to me that the attachment
> point is so far above the center of the back that it can't bend the spine
> backwards. Put another way, the center of gravity is way below the
> attachment point, so I don't see how the legs could swing upwards and you
> could end up horizontal with the lanyard pulling the center of your body
> upwards. The mass of the body below the pivot point is much, much greater
> than the mass of the body above the pivot point.
>
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