At 05:48 AM 2/12/02 -0800, Frank Ayers wrote:
>
>
>>--- Original Message ---
>>From: kb9cry@attbi.com
>>To: towertalk@contesting.com
To: <towertalk@contesting.com>
>>Date: 2/11/02 11:26:59 AM
>>An important note to make is that all of you should have
>>a shock absorbing lanyard. The reason is, to sum it up
>>greatly, is that when your body falls, and then is
>>abrupty stopped by a line, the forces that are exterted
>>on the body are on the order of about 5000 lbs for a
>>typical 300 lb body. That's enough force to really mess
>>you up. The shock absorbing lanyards are designed to
>>cushion the fall shock to on the order of around 500 lbs.
>
>Question - I've always used a lanyard made from some heavy dynamic
>kermantle climbing rope. Would you think that would suffice or
>would you suggest getting one of the commercial "progressive"
>shock absorbing lanyards?
Wait a sec -- the physics don't compute. If you have the fall arrest
lanyard hooked above your head somewhere, you will only fall a couple of
feet before it takes up the slack -- no way 1/2 MV^2 adds up to the sort of
numbers portrayed above. Presumably the type of lanyard discussed is of
the one-use type, which stretch/tears and doesn't rebound (much). I would
think a greater worry would be banging your head against the tower, and
that risk might actually be increased if the lanyard was too elastic.
73, Pete N4ZR
Sometimes a tower is
just a tower
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