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Kernmantle construction may be used for both static and dynamic ropes. Static ropes are designed to allow relatively little stretch, which is most useful for applications such as hauling and rappelling. Dynamic rope is used to belay climbers, and is designed
A static rope is a low-elongation rope that is designed to stretch minimally when placed under load, typically less than 5%. In contrast, a dynamic rope is designed to stretch up to 40%. [ 1 ] Static ropes have a wide variety of uses, for instance in fire rescue operations [ 2 ] and caving .
Rope rescue is a subset of technical rescue that involves the use of rope, be it steel or cable rope, or more commonly used nylon, polyester, or other type of rope. Kernmantle (kern = core and mantle = sheath) rope as it is called, is available in various types: dynamic (stretches to absorb the shock of a falling lead climber or rescue ...
Climbers instead use cord (or "accessory cord"), which is a length of thinner approximately 4 to 8 mm (0.16 to 0.31 in) static kernmantle rope, tied via a double fisherman's knot into closed loops of any size. [1] [11] Cord loops (also known as "cordelettes") serve a wide variety of functions in rock climbing.
Although ropes made of natural fibres such as hemp and flax were used in the early days of alpinism, [1] modern climbing uses kernmantle ropes made of a core of nylon or other synthetic material and intertwined in a special way, surrounded by a separate sheath woven over it. The main strength of the rope is in the core, and the sheath of the ...
Unlike most climbing equipment, dynamic ropes do not have a rated tensile breaking strength. Instead, the strength of a rope is tested by the number of standard test falls a rope can sustain before breaking. The test falls use an 80 kg weight for single ropes (55 kg for half ropes), and a fall factor of 1.7 (4 meter fall on 2.3 meters of rope ...