| Knots & Lashing |
| 1. INTRODUCTION Ropes are generally constructed of one of the three materials, natural then came wire. Since World War II, the trend has been toward synthetic fibre although wire rope is still widely used. Natural Fibre has gradually been displaces and is seen only rarely these days. Boat, in particular, tend to use wire and synthetic fibres ropes almost exclusively for rigging. 1.1 TYPES OF ROPE Ropes come in all shapes and sizes. The size of the rope refer to its circumference and not its diameter. Some common materials used for rope making are nylon, polyester, hemp, manila, sisal, cotton and jute (in order of decreasing strength). � Natural Fibre Ropes - Hemp, manila , sisal, cotton are some of the natural fibres used in rope construction. Natural fibres ropes rot easily under harsh sun and wet conditions. The strength of a natural rope is also limited due to the fact that natural fibres are relatively short. � Synthetic Fiber Ropes - Example of synthetics ropes are nylon(polyamide), polyester and polypropylene. Nylon ropes has great elasticity as compared to most synthetic ropes. It is also good at absorbing shock loads. This property also makes it unsuitable for tying some of the rope obstacles. Polyester ropes have less stretch than nylon. It is used in activities where minimal stretch is required, like sailboat sheets ad mooring lines. It is easy handle and resistant to ultraviolet. Polypropylene is a cheap general purpose rope. It comes in many colours and it floats. Synthetics ropes are stronger ad lighter than natural fibres of the same size. They are also more resilient to rot as they absorb less water. Synthetic ropes are relatively smoother and some knots are likely to undo themselves. They are sensitive to overheating. Synthetics rope should never be allowed to slide through hands as s this will cause frictional burn. 1.2 Coiling of Ropes Simple Coiling Old Navy Coil Whipping Whipping is done by binding the end of ropes with twines to prevent it from fraying out. Principally, a whipping is used to prevent the rope from unlaying and destroying itself. Whipping is preferred to back splicing, which thickens the rope and prevents it from being reeved through block. � Simple String whipping � Common Whipping � West Country whipping |
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