What is the primary function of stopper knots?

The primary function of stopper knots is to prevent rappelling off the end of a rope. This is crucial in any rope rescue operation or rappelling activity, as not having a stopper knot can lead to a dangerous fall when the climber or rescuer reaches the end of the rope. By tying a stopper knot, such as a double figure-eight knot or a water knot, individuals can create a physical barrier at the end of the rope that ensures they cannot slip off the end, thereby enhancing safety during vertical movements.

Understanding this safety measure is essential for anyone involved in rope operations, as it demonstrates the importance of knot tying in preventing accidents and ensuring the well-being of all participants in rescue scenarios. Other functions of knots, such as connecting two ropes or securing equipment, are indeed important but do not specifically address the critical safety concern of falling off the rope.