Piggyback systems

To get even more mechanical advantage out of a rescue hauling setup, you can piggyback two systems. For example, establish a separate single-pulley setup to haul on the rope coming from a Z-pullcy system. This now gives you a 6-to-l theoretical mechanical advantage. Or set up a single pulley to haul on another single-pulley system for a 4-to-1 advantage.

To piggyback two systems, set up your initial hoist to the fallen climber, either a single pulley or a Z-pulley. Now establish a second anchor some distance behind the main one, to anchor the second system. Attach the second hoist, again either a single pulley or a Z-pulley, to the accident rope at the point where the rescuers would normally pull.

As you might guess, piggyback systems require an ample supply of slings, pulleys, carabiners, anchor material, and rope.

Continue reading here: The Bilgeri rescue

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