We often field specific questions regarding our extensive line of Rescue Throw Bags and Tow Lines. So in the spirit of sharing information, here are some FAQs to our most popular inquires.
What are the differences between Polypropylene and Spectra Core Rope?
Polypropylene rope: has a breaking strength half that of a Spectra core line, is less expensive and therefore ideal for throw bags that will be used primarily for setting safety, bagging swimmers or use as tow lines. Poly 5/16” 1,000 lb, 3/8” 2,000 lb.
Spectra Rope: bomber strength called upon for heavy lifting and moving big loads it is double the strength of polypropylene rope of similar diameter. The Spectra throw bags carry heightened insurance coverage for boaters who in a pinch might recruit their bags to be used as haul lines (removing a pinned kayak) or hanging oneself over the edge of rock at rivers edge. Spectra 5/16” 2,500 lb., 3/8” 3,500 lb.
Why the different Diameters and Lengths for ropes?
Ropes are available in either 5/16" or 3/8" diameter. The smaller 5/16" rope is ideal for stuffing longer lengths of rope into a bag or simply keeping it small when space is at premium. The larger 3/8" is a pleasure on the hands, easy to work with and has twice the strength of 5/16". Rope lengths are available from 50’ all the way up to 85’in length. Kayakers and canoeists often pack shorter rope bags due to space limitation. Ropes with 70’ or more are sometimes required by state boating laws and yet others prefer longer lengths should they be called into action to perform rescue operations such as removing pinned boats.
Do your ropes float?
Yes, both the Polypropylene and Spectra ropes used in our comprehensive throw bag line-up have minimum moisture absorption and float. In addition to floating they have extremely good visibility and strength. All Salamander throw bags are constructed of urethane coated 500 D Cordura and contain closed cell foam to insure the empty bag floats.
Do knots affect the strength of a rope?
Knots can reduce the tensile strength of a rope as much as 60%. Maximum load and or tensile strength to which we refer are indicated for the rope alone and set by the manufacturer. In the wide world of Ropes and Knots it is generally agreed that knots reduce the strength of a rope however studies with charts indicating percentages are difficult to come by. For those who wish to dig deeper and glean more info check with the good folks at Knot Blog
I notice the Polypropylene ropes use an MFP rating, what does this mean?
MFP stands for multifilament polypropylene. Qualities present are easy handling, holds knots well and has low water absorption and floats.
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