Quick Answer
An ideal rope length for backcountry rescue situations is 60-70 feet to allow for sufficient anchor placement, adequate rope sag, and a safe working length when using a pulley system or rope assist device.
Choosing the Right Rope
When selecting a rope for a backcountry rescue, consider a durable, high-strength rope with a diameter of 11-13 mm. This size provides a good balance between strength, weight, and ease of handling. For example, a 11.7 mm diameter rope has a minimum breaking strength of 24,000 pounds.
Rope Length and Sag
A 60-70 foot rope length provides adequate sag when using a pulley system or rope assist device. This range allows the rope to stretch 10-20% of its length, which is essential for a smooth, controlled descent. For instance, a 70-foot rope will sag 7-14 feet when loaded with a person, ensuring a safe working length.
Rope Rigging Techniques
When setting up a rope rescue, use a secure anchor point to attach the rope. A 12-foot anchor length provides sufficient stability and allows for easy adjustment of the rope’s angle. Use a pulley system or rope assist device to control the rope’s movement and maintain a safe working length. For example, a 3:1 or 4:1 mechanical advantage system can help reduce the effort required to pull a person up or down a steep slope.
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