Blue Mountains Climber's Rescue Group

Pulley, Hauling System Ratios & Mechanical Advantage

• Anchors have been simplified for this diagram, usually 3 or more equalised anchors are to be used.
• Rescue line is to be belayed through a GriGri (not shown).
• Reversible Brake and separate Belay Rope are not shown for clarity.
• A pliable static rope is best for the bolt on hauling system rope, failing that an 11mm dynamic rope is acceptable but only for a 4:1 or 5:1 system.
• If double becket (ended) pulleys are not available they can be replaced with single end pulleys. The rope end must be tied to a carabiner beside the pulley. Some extra friction will be generated.      (drawing by Lucas Trihey 8/00)

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