66:. These Prusiks provide fixed attachment points on the rope that can be moved when slightly loosened. The first Prusik knot is attached to the "traveling pulley," allowing it to pull on the load. The second Prusik knot is used to hold the position of the rope and is referred to as a 'progress capture device' or ratchet. Because the tension on the line stores energy and could present a dangerous flying hazard if the rope were to break. It is also advisable to attach a towel or soft object (such as a life vest) to the end of the line near the connection to the object being pulled, to act as padding, and/or a damping device.
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47:. The advantage will also be reduced if the pull on the hauling end is not parallel to the direction the load moves in. The name comes from the fact that the arrangement of lines is roughly Z-shaped. Besides the mechanical advantage to pulling, it also uses only part of the total length of the rope for the
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39:, that is commonly used in rescue situations. The basic arrangement results in pulling the hauling end 3 times the distance the load is moved, providing a theoretical mechanical advantage of
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rescue and is used primarily for the recovery of pinned boats. It is also considered a useful tool in many types of
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Techniques for Canoeists, Kayakers, and Rafters
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is an arrangement of lines and pulleys, effectively forming a
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The typical configuration (see diagram) uses two single
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186:"Whitewater Rescue: How To Set Up A 3:1 Z-Drag System"
101:- another 3-fold advantage system using single loops
158:(2nd ed.), Boston: AMC Books, pp. 128–133
89:, where the other end is fixed to a stable object.
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212:"What Is A Z-Drag and How Does It Work?"
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16:Method of increasing the pull on a rope
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296:. You can help Knowledge (XXG) by
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184:Jeff Jackson (1 February 2012).
154:Bechdel, Les; Ray, Slim (1989),
125:"How to set up a Z-Drag System"
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169:Ashley, Clifford W. (1944),
23:Typical Z-Drag Configuration
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171:The Ashley Book of Knots
62:loops or other suitable
292:This tool article is a
129:Rope Knots by NetKnots
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105:Mechanical advantage
269:Swiftwater Rescue
234:General references
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353:Swiftwater rescue
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348:Ropework
93:See also
58:and two
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33:Z-Rig
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