What is the efficiency rating of a bowline on a bight?

The efficiency rating of a bowline on a bight is commonly understood to be around 65%. This rating indicates that when using this knot, up to 65% of the rope's original strength can be utilized effectively. The bowline on a bight forms a secure loop at the end of a doubled rope, which is useful for various applications in rigging and lifting. It is known for being easy to untie after load, despite being secure when under tension.

The efficiency rating takes into account factors such as the way the knot interacts with the rope fibers and the potential for strength loss due to the bending and friction that occurs when a knot is tied. While other knots may offer higher efficiency ratings, the bowline on a bight maintains a balance of security and ease of use, which is crucial in many working environments. Understanding these properties is essential for selecting the right knot for specific tasks in substation operations and safety practices.