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 Maintaining a pulley tension system to the highlines utilizing a “slipping clutch” (or safety fuse) in the form of system prusiks.  All knots on the control lines must be bypassed.  Full strength of the trackline must be utilized by eliminating all knots, and all sharp bends. This alone will multiply (with the rescue load in the middle of the trackline) the weight of the load anywhere from 2 times at 150 degrees to 11 times at 175 degrees at each anchor!īecause of this tremendous stress highlines put on the anchors, here are some key principles that must be included in the construction of highlines: With highlines, you are looking at a vector angle of 150 degrees and up. In most cases, we try to keep the angle between multi-point anchors 90% or less, at 120 degrees the force at each anchor equals the weight of the load. If over tensioning and rope abrasion are the archenemies of rope rescue operations than consider these two evils the devil incarnate to a highline.īy its very nature, highlines go against most conventional rules of safe anchor building. The good side of highlines is that it is a viable option the bad side is that there are numerous reasons why not to do one. Highlines are almost always a last resort option. Typically, highlines are incorporated where a long expanse or swiftwater must be negotiated for the successful extrication of the victim. It is that rare 1% of the time that a highline might be needed. Gear List and Resourcesĩ9% of the time, most high-angle rescues can be accomplished through the use of helicopters, and/or a mainline/belay line system combined with various forms of offsets. This section of this chapter gives only a general overview of this extremely complex subject of highlines. Anyone interested in performing a highline must have intermediate skills, and seek advanced training through an accredited school of rope rescue. Under no circumstances should a highline be attempted solely on the instruction of this book. Highline rescues invoke the use of advanced rigging skills, performed by advanced technicians. Highline operations are one of the most dangerous and most difficult vertical rescues. Basic Highline System with Pulleys, Rope and Pulley Systems for High Angle Technical Rescue