What is the efficiency rating of a Bowline?

The Bowline knot is well-known in rigging and sailing due to its simplicity and strength. Its efficiency rating typically falls around 60%. This means that when a load is applied to a Bowline knot, it retains about 60% of the rope's original strength.

This rating is influenced by the knot's ability to maintain a strong hold while being relatively easy to untie after being loaded. While some knots have higher efficiency ratings due to their design and the way they distribute load (like the square knot at about 75% or the figure-eight knot at around 80-85%), the Bowline’s efficiency is lower primarily because it can introduce a significant amount of stress on the rope fibers due to the bend and pinch created in the knot.

Understanding the efficiency of various knots is crucial in rigging, as it directly affects the safety and capability of lifting equipment. Thus, the Bowline is appreciated not just for its efficiency but for its versatility and ease of use, despite its somewhat lower strength retention compared to other knots.