How much is the rated load increased when tying knots in synthetic rope lashing?

When tying knots in synthetic rope lashing, it's important to recognize that the efficiency of the rope can be affected by how it is manipulated, including the formation of knots. The rated load of a rope generally represents the maximum load it can handle without failure under straight tension. However, when a knot is introduced into the rope, it can reduce the effective strength of the rope due to the way the fibers are bent and compressed.

In the case of synthetic ropes, research and practical application have shown that when appropriate knots are tied, the overall load-carrying capacity can be significantly reduced. Specifically, the rated load is often reduced by about 50% on average when knots are tied. This substantial decrease reflects the increased stress and potential for slippage or failure at the knot, which can occur even in high-quality synthetic materials.

Thus, stating that the rated load increases by 50% when tying knots suggests that the effective load the rope can bear is actually halved, which reflects the inherent risks and limitations of using knots in rope lashing. Understanding this aspect is crucial for safe and effective use of synthetic ropes in various applications.