By what percentage does the double fisherman's knot reduce rope strength?

The double fisherman's knot is widely used in rope rescue and climbing applications due to its reliability and strength. When tying the double fisherman's knot, it is important to understand its impact on the overall strength of the rope. Research indicates that the double fisherman's knot typically reduces the strength of the rope by approximately 21 percent.

This percentage represents the reduction of the rope's original strength due to the formation of the knot, which can cause localized stress and alter the distribution of forces within the rope. Understanding this percentage is crucial for rescuers, as it helps ensure that they account for the strength reduction when planning and executing rescue operations. Knowing that using this knot results in a 21-percent strength reduction allows for informed decision-making regarding safety margins and load limits in various rope rescue scenarios.