What percentage of working capacity is lost when a knot is tied?

When a knot is tied in a substance, particularly in materials like rope or cord, it can significantly reduce the working capacity of that material due to the alteration of its structure. A knot introduces additional stress points and can create weaknesses in the material's overall integrity. Specifically, tying a knot can result in the loss of about 50% of the working load or capacity because the knot causes the material to bear loads differently than it normally would when straight and unhindered. This means that the material must account for both the stress of the load and the new dynamics introduced by the knot, leading to a reduction in its effective strength.

This understanding is crucial in any field that relies on the use of knots, such as climbing, sailing, or construction, as it impacts safety and effectiveness in practical applications. Recognizing this percentage helps practitioners make informed decisions regarding the use of knots in various scenarios to avoid potential failures.