What efficiency percentage does the Square Knot achieve?

The Square Knot, also known as the Reef Knot, achieves an efficiency percentage of around 60%. This efficiency indicates how much of the rope's strength is retained after the knot is tied. A Square Knot works well for joining two lengths of rope, particularly when the ropes are of the same diameter and material. Its design allows for a quick and simple tie that is less likely to slip under certain conditions, but it can be unreliable when subjected to heavy loads or if the ropes are of different thicknesses or materials.

While the Square Knot is easy to remember and tie, it does not retain the full strength of the rope due to the reduction in the effective diameter where the knot constricts the fibers. Understanding this efficiency is crucial for riggers when deciding which knot to use for a particular job, as it impacts safety and reliability in rigging applications. Choosing a knot with a higher efficiency percentage might be necessary for critical loads or safety considerations.