[Public-List] Nylon vs. Dacron rope?

[Michael Grosh]

I think the rule of thumb for nylon is it stretches 10% at it's working
load, which for 7/16 is somewhere around 800-1000 lbs. (5900 tensile
strength). That's a lot of energy stored waiting to take out someone.
Probably best just to assume something with a snap shackle is dacron
(polyester).
MichaelGrosh
On Dec 25, 2013 7:45 PM, "George Dinwiddie" <gdinwiddie at alberg30.org> wrote:

> David,
>
> You're probably right that the one with a shackle is a spinnaker pole
> lift, in which case it would be dacron. The others might be spinnaker
> sheets, which would also be dacron.
>
> The principle reason for choosing between dacron and nylon is the stretch
> characteristics. If you need a piece of nylon for it's stretch, you could
> try stretching it and see how stretchy it is. Old nylon might not be as
> stretchy as you like. Conversely, old dacron might stretch more than you
> like for non-stretch applications.
>
>  - George
>
> On 12/25/13, 4:24 PM, Amy & David Swanson wrote:
>
>> Merry Christmas!
>>
>> I have a number of lines that came with my boat years ago that I am
>> trying to sort through this winter.  Most of the are easy to identify in
>> terms of material, construction, and use, but a couple have me baffled.
>> There are 3 in particular that I am not sure if they are nylon or
>> low-stretch Dacron. These are white 3-strand twisted construction, 3/8"
>> or 7/16" diameter.  One has a snap shackle spiced into one end.  I think
>> some of these might be a spinnaker pole lift and/or guy (my boat came
>> with a spinnaker but the pole is long gone and I never tried to sort
>> ought the set up).  Is there an easy way to tell what material these are
>> made of?  Or should I just cut the shackle off, and use the rest to hang
>> fenders, etc.?
>>
>> Thanks!
>>
>> David Swanson
>> Strayaway Child
>> Alberg 30 #229
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