This topic contains 12 replies, has 1 voice, and was last updated by Lárus Rafn Halldórsson 14 years, 10 months ago.
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Reglulega hefur komið upp umræða um spotta og hnúta og annað tengt því. Ég var að skoða upplýsingar frá framleiðanda á ýmsum spottum og sá þar upplýsingar um hvaða áhrif raki hefur á styrk nylon spotta, vildi deila þessu með ykkur. Þess ber að geta að þetta er framleiðandi á klifurlínum og slíkum bandspottum, en nylon er hins vegar nylon. Þetta er í FAQ hjá Sterling Rope, http://www.sterlingrope.com/media/document/techmanual.pdf
3. What happens to my nylon rope when it’s wet?
Nylon fiber is affected by the absorbtion of water. Nylon is hydrophilic meaning it will absorb water.
The overall strength and stretch can be greatly affected by moisture in the fiber. Whenever possible
try and keep your ropes away from water and as dry as possible. Our in-house testing shows that
loss of strength in wet ropes may be as high as 70% in nylon ropes without DryCore™ but only 40%
in ropes with DryCore™. A 11mm Drycore™ rope that holds 11 falls dry, holds 7 falls wet. That
same rope without DryCore™ may hold only 3 falls when wet. In general the data shows that the
loss of strength through the presence of water in nylon ropes is significant. The good news is that
nylon’s original strength and elongation returns when the rope dries.Og í sambandi við hnúta hafa þeir þetta að segja.
11. How much strength does my rope loose when I tie it in a knot?
There are a lot of publications available that contain information about knots and knot strength. For
that reason we will not include much information here, except to say that knots reduce the overall
strength of a rope. Therefore, whenever possible use a tensionless knot around a cylindrical object with
at least a 4’’ diameter. Four inches is the magic number for maintaining full strength in a rope up to
5/8’’. Any bend tighter than 4’’ reduces the strength of rope because they stress the rope in flexure, the
fibers’ weaker direction. Here is a list of some common knots and the translating remaining rope
strength.
Knot Strength
NO Knot 100%
Double Fisherman’s 65-70%
Bowline 70-75%
Water Knot 60-70%
Figure 8 75-80%
Clove Hitch 60-65%
Fisherman’s 60-65%
Overhand 60-65%
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