heavy duty bungee cord
Bungee twine is made of one or extra strands of an elastic cloth, commonly rubber, bound collectively with the aid of a material protecting. It is generally used as a tie-down for luggage or gadget carried at the outdoor of a car. Bungee wire is also used by the army to absorb the outlet surprise of the huge shipment parachutes when losing heavy loads including tanks. The improvement of long, heavy-duty bungee cord for the navy has led to the recreational sport of bungee jumping. In this recreation, the participant jumps from an elevated shape while sporting a harness connected to one end of a protracted bungee wire with the alternative cease attached to the structure.
The term "bungee" or "bungie" is idea to be British slang for india-rubber. Some references to the india-rubber initially used for erasing pencil marks on paper name it "india-bungie." Another source claims the term changed into derived from the Anglo-Indian word "bangy" referring to the colloquial term for a yoke carried on the shoulder with two equal masses suspended with the aid of cords the front and rear. In both case, the concepts of an elastic material and load-bearing cords both observe to the present day bungee twine.
The history of bungee jumping as a recreation or test of courage is believed to this point again 1500 years to Pentecost Island in what's now the Republic of Vanuatu inside the South Pacific. According to nearby legend, a spouse felt she became being mistreated by using her husband and fled, taking safe haven in a tall tree. As her husband turned into climbing the tree in pursuit, she secretly tied vines around her ankles. When he tried to seize her, she jumped. He jumped after her and fell to his death. The springy vines broke her fall and she lived. After that, the men of the island decided that no girl need to ever trick them again, and they began to practice jumping with vines. In time, it have become a test of courage, with the bravest guys jumping from a top of 80 feet (24 m) to have their heads brush the ground earlier than the vines completely stopped their fall.
Modern bungee jumping using elastic bungee cords started out inside the past due 1970s. On April Fools' Day in 1979, the Oxford Dangerous Sports Club of Britain stuck the public's attention while members bungeed off the 245-foot (75 m) Clifton Bridge in Bristol, England. Since that time, bungee leaping has end up a commercialized recreation with lots of participants.
The elastic cloth of a bungee wire is typically made from herbal or synthetic rubber. Natural rubber, sometimes referred to as latex rubber, has remarkable extensibility (the ability to be extended), resilience (the capacity to regain its original form after being extended), and tensile power (the potential to be extended under load without breaking). For these properties, it makes an splendid cloth for bungee cords. Natural rubber has the negative aspects of having best honest resistance to air and the ultraviolet radiation in sunlight. Synthetic rubbers, including neoprene, have higher resistance to air and sunlight, however less resilience and tensile energy than herbal rubber. The navy specification (mil-spec) for bungee cords permits both natural rubber or artificial
rubber, or a aggregate of both. Reclaimed rubber won't be used for milspec cords. Natural rubber is extensively used for cords used in bungee jumping.
The material overlaying for the bungee cord can be braided from cotton or nylon yarn. Commercial bungee twine generally has a unmarried layer of nylon overlaying which is greater resistant to abrasion and has a higher tensile power. Mil-spec bungee wire is required to have layers of cotton covering. Some cords used for bungee leaping have cotton overlaying, similar to the mil-spec wire. Other specifically designed bungee leaping cords have a braided masking of herbal rubber.
Standard business bungee wire is to be had in diameters from approximately 0.25-inch to 0.62-inch (0.64-1.6 cm). Mil-spec twine is to be had from 0.25-inch to 0.87-inch (0.64-2.2 cm) in diameter. These cords require no new design work apart from an occasional change inside the colors of the outer overlaying. (See Quality Control). Bungee leaping twine is usually approximately 0.62-inch (1.6 cm) in diameter and is commonly for my part designed by using every bungee jumping organization to its specifications.
Custom-made bungee cord may be required for unique applications. When one mild truck manufacturer determined to illustrate the electricity in their product's frame, they despatched the automobile bungee jumping off a bridge. This stunt became featured in a business on countrywide television and required a fixed of nine specifically designed bungee cords, each 5 inches (13 cm) in diameter and 100 feet (30 m) long.