Which knot would be least effective for forming a loop?

The water knot is designed primarily for joining two ends of flat webbing and is not ideal for forming a secure loop. The primary purpose of this knot is to create a connection between two pieces of webbing, making it effective for applications where joining webbing is necessary, such as in rescue scenarios. However, it does not create a stable loop that would hold a load effectively.

In contrast, the bowline is specifically known for creating a fixed loop at the end of a rope, which remains secure under load. The sheet bend is effective for joining two different-sized ropes and can also create a loop when utilized correctly. The figure-eight bend, while traditionally used for joining two ropes, can also be manipulated to form a loop, providing stability and security.

Thus, the water knot’s lack of effectiveness in creating a loop makes it the least suitable option among those provided.