## Re: [KnotTyers] Amsteel question

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• Something which I haven t seen anyone discuss but which seems pertinent to me is the effect of sag in the hammock on the tension in the lines. The maths get
Message 1 of 7 , Mar 4, 2013
Something which I haven't seen anyone discuss but which seems pertinent to me is the effect of sag in the hammock on the tension in the lines. The maths get terribly complicated, but a simple diagram taken from lifting sling spread tables shows the effect.

As you can see, if you rig your hammock nearly flat, the tension in the lines is 11.49 times the applied load. While modern lines can probably accept this loading, old fashioned tree bark probably can't ! Factor in some shock loading from rough use and things get way out of hand!

Happy camping, Peter H.

On 3 Mar 2013, at 01:54, "brendamcguinn" <brendamcguinn@...> wrote:

> My boyfriend had a question I was hoping someone might could answer. We are planning to do some hammock camping this spring. David has been playing around with some different hanging systems. He wants to use Amsteel rope to cut down on weight while keeping strength. He read that tying knots in Amsteel rope would degrade its strength. What he was wondering was is the strength effected only while the rope was tied or if even after the knot was taken out does the rope remain weaker. Since the rope is being used to hang hammocks it will be supporting a person's weight overnight and taken down the next morning. I was just wondering if anyone out there has any experience with that kind of rope.
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• I don t have your diagram but I think you must have a unit problem here. Did you start with kilos and end up with newtons? ... [Non-text portions of this
Message 2 of 7 , Mar 5, 2013
I don't have your diagram but I think you must have a unit problem here.

>________________________________
> From: Peter Hennessey <peterwhennessey@...>
>To: "knottyers@yahoogroups.com" <knottyers@yahoogroups.com>
>Sent: Monday, March 4, 2013 2:48:32 PM
>Subject: Re: [KnotTyers] Amsteel question
>
>

>Something which I haven't seen anyone discuss but which seems pertinent to me is the effect of sag in the hammock on the tension in the lines. The maths get terribly complicated, but a simple diagram taken from lifting sling spread tables shows the effect.
>
>As you can see, if you rig your hammock nearly flat, the tension in the lines is 11.49 times the applied load. While modern lines can probably accept this loading, old fashioned tree bark probably can't ! Factor in some shock loading from rough use and things get way out of hand!
>
>Happy camping, Peter H.
>
>On 3 Mar 2013, at 01:54, "brendamcguinn" brendamcguinn@...> wrote:
>
>> My boyfriend had a question I was hoping someone might could answer. We are planning to do some hammock camping this spring. David has been playing around with some different hanging systems. He wants to use Amsteel rope to cut down on weight while keeping strength. He read that tying knots in Amsteel rope would degrade its strength. What he was wondering was is the strength effected only while the rope was tied or if even after the knot was taken out does the rope remain weaker. Since the rope is being used to hang hammocks it will be supporting a person's weight overnight and taken down the next morning. I was just wondering if anyone out there has any experience with that kind of rope.
>>
>>
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