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Note 44.330 MOUNT-L 330 of 517 CUPIDO::STRITAR "Andrej Stritar,IJS,(61)-371-321" 41 lines 1-MAR-1994 08:19
CUPIDO::STRITAR "Andrej Stritar,IJS,(61)-371-321" 41 lines 1-MAR-1994 08:19
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From: STENAR::STENAR::MRGATE::"X400::1=de::2=d400::3=tr::5=EDU::4=METU::4=CC::4=VM::6=MOUNT-L" 2-FE
To: CUPIDO::STRITAR
CC:
Subj: RE: Rope strength

From: NAME: Mountaineering Discussion List MOUNT-L
FUNC: edu <6=MOUNT-L@4=VM@4=CC@4=METU@5=EDU@3=TR@2=D400@1=DE@X400@STENAR>
To: NAME: Multiple Recipients of
FUNC: edu <6=MOUNT-L@4=VM@4=CC@4=METU@5=EDU@3=TR@2=D400@1=DE@X400@STENAR>

RFC-822-HEADERS:
Comments: To: MOUNT-L@vm.cc.metu.edu.tr

Date: 02-Feb-1994
Posted-date: 02-Feb-1994

A dynamic rope is not recommended for Z-drag systems. A rope such as the one
you described is meant to hold falls for a lead climber. It has a limited
number of "falls" for a life expectency. Since the Mammut rope you described
is not intended for river rescue, it will perform poorly and likely with a
short life expectency. A rope used in a z-drag should be designed to hold
"heavy" loads for a long period of time, not a sudden heavy load for a short
period of time asiin a "shock" situation.

Another drawback that I find is that this rope will likely hold water and
become very heavy--something I would not want in my boat!

I am concerned that using a dynamic line like a Mammut 11mm for z-drags will
over some unkown period of time result in a failure of the rope with the
potential for injury--especially if used in a boat recovery under a heavy load
(eg: 12 mph current creating an average total force of water on a swamped boat
of
of 2688 pounds--without accounting for friction on the "pinning object").

Marc Connolly

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