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Subject: Re: [world-cruising] A serious question re Jack lines
JAXAshby@XXX.XXX
Date: Sun Feb 09 2003 - 08:42:27 EST
In a message dated 2/9/2003 8:06:32 AM Eastern Standard Time,
rick@XXX.XXX writes:
> Webbing's going to stretch, but it also absorbs a lot of shock. The
> downside is that it's possible to end up on the other side of the lifelines
> with a 6 ft tether and that much give in the jackline.
>
You want the stretch. Coming up short and HARD is tough on the body. The
G-loads can be pretty serious when there is little stretch (think of a
putting on your hardness, attach it to a steel beam with a tether that allows
you to end up just three feet below the beam. Now, fall over sideways.) and
can break bones. OSHA safety gear has stretch built in. A stretch of just
three inches has a 100x less G-shock load than a stretch of 3/100ths of a
inch.
You want to end your jacklines far enough forward so that if you do happen to
need them you can't end up being dragged behind the boat, but rather at worst
along side it and up against the hull. Even the finest of athletes can't
pull themselves forward against more than about 3 knots of water speed. Mere
mortals can't do even that.
[Non-text portions of this message have been removed]
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