What happens to a prusik cord when it is overloaded with the right sized cord?

When a prusik cord is overloaded with a cord that is appropriately sized for the application, it typically slides under load due to the mechanics of the knot and the properties of friction. A prusik knot is designed to grip the rope when a load is applied to it but will allow for movement when it is not under tension.

In situations where the load exceeds the grip limit, the knot gives way, causing it to slide freely along the rope. This sliding ability can be beneficial in a rescue scenario where controlled descent or ascent is necessary. It allows the rescuer or victim to adjust their position while still providing security when the load is static.

Should the diameter of the cord used for the prusik not be within the recommended range for the rope it is attached to, the knot may not function correctly, compromising safety and effectiveness. This is crucial for rescue situations where precision and reliability are paramount. The mechanics of the prusik knot leverage principles of friction and tension, leading to its capability to slide under specific loading conditions.