Which knot has an efficiency rating of 65%?

The Bowline on Bight is recognized for its efficiency rating of 65% due to the way it is tied and the manner in which it maintains strength under load. This knot creates a fixed loop at the end of a rope and is particularly useful in situations where a secure loop is needed without risking a slip. The structure of the Bowline on Bight allows it to hold strong under tension while still being relatively easy to untie after use.

In contrast, other knots like the Square knot, Running Bowline, and Sheet Bend have different applications and efficiency ratings. The Square knot is primarily used for joining two lengths of rope and is not designed to maintain strength under load as effectively as the Bowline on Bight. The Running Bowline offers a secure loop similar to the Bowline but is usually considered stronger, often exceeding the efficiency of the 65% mark. The Sheet Bend is employed for joining two ropes of different diameters and focuses more on the security of the join than on maintaining a specific efficiency rating. Thus, when discussing the specific efficiency rating of 65%, the Bowline on Bight stands out as a reliable choice for creating a loop while balancing strength and ease of use.