ROPEWORK 5 Chapter 5 ROPEWORK


Although the materials are very different, ropes and the ways we use them would have been familiar to prehistoric man. In fact the switch from natural fibres is a surprisingly recent development, with sisal, manila and cotton giving way to modern synthetics only during the last half of the 20th century.


Synthetic ropes are described by their construction and material, with the last being the most important. Constructional options divide between the traditional and most easily recognisable 3-strand and various types of braided or plaited ropes.


3-strand is generally the least expensive and is by far the easiest to splice (see page 39). There are some very exotic modern fibres around, but only three that really interest us:


Nylon


This is a material all anglers will be familiar with, since in its monofilament form it represents by far the most common type of fishing line. It’s strong and stretchy – exactly what you want to absorb shock loads. And the same qualities that allow it to withstand the strike of a big fish also make it ideal for anchor warps and mooring lines.


Nylon has good resistance both to abrasion and attack by UV light. Unfortunately, it is slightly absorbent and becomes stiffer when wet. Over a period of time this process draws impurities into the fibres and the rope can become permanently stiff and awkward to handle.


Polyester


Having about the same strength but much less stretch than nylon, polyester is a deservedly popular rope for general usage. Because it remains soft and flexible even when wet, many skippers prefer it for their mooring lines, despite its lack of elasticity. Polyester stands up to UV light pretty well and is resistant to flexural fatigue. An excellent all-round performer.


Polypropylene


The main claim to fame of this lightweight fibre is that it floats. It has much the same stretch characteristics as polyester but is only about 65% as strong. It’s also more susceptible to UV degradation than the other two.


Nevertheless, it has its merits. Its natural buoyancy makes it the obvious choice for such things as lifebuoy tethers and heaving lines (see page 44) and it’s also relatively inexpensive.


RYA Seamanship for Sea Anglers


35


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