Bungee jumping
Bungee jumping (also spelled "Bungy" jumping)bridge or crane; but it is also possible to jump from a movable object, such as a hot-air-balloon or helicopter, that has the ability to hoverfree-falling as from the rebounds. is an activity that involves jumping from a tall structure while connected to a large elastic cord. The tall structure is usually a fixed object, such as a building, above the ground. The thrill comes as much from the When the person jumps, the cord stretches and the jumper flies upwards again as the cord snaps back, and continues to oscillate up and down until all the energy is dissipated.
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History
The word "bungee" (pronounced /ˈbʌndʒiː/) originates from West Country dialect, meaning "Anything thick and squat", as defined by James Jennings in his book "Observations of Some of the Dialects in The West of England" published 1825. Around 1930 the name became used for a rubber eraser. The word bungy, as used by A J Hackett, is said to be "Kiwi slang for an Elastic Strap". Cloth-covered rubber cords with hooks on the ends have been available for decades under the generic name bungee cords.
In the 1950s David Attenborough and a BBC film crew brought back footage of the "land divers" of Pentecost Island in Vanuatu, young men who jumped from tall wooden platforms with vines tied to their ankles as a test of their courage and passage into manhood. A similar practice, only with a much slower pace for falling, has been practised as the Danza de los Voladores de Papantla or the 'Papantla flyers' of central Mexico, a tradition dating back to the days of the Aztecs.
A tower 4,000 feet high with a system to drop a “car” suspended by a cable of “best rubber” was proposed for the Chicago World Fair, 1892-1893. The car, seating two hundred people, would be shoved from a platform on the tower and then bounce to a stop. The designer engineer suggested that for safety the ground below “be covered with eight feet of feather bedding”. The proposal was declined by the Fair’s organizers.
The first modern bungee jumps were made on 1 April 1979 from the 250-foot Clifton Suspension Bridge in Bristol, by David Kirke, Chris Baker, Simon Keeling, Tim Hunt and Alan Weston of the Oxford University Dangerous Sports Club.The jumpers were arrested shortly after, but continued with jumps in the US from the Golden Gate and Royal Gorge bridges, (this last jump sponsored by and televised on the American program That's Incredible) spreading the concept worldwide. By 1982 they were jumping from mobile cranes and hot air balloons. Commercial bungee jumping began with the New Zealander, A J Hackett, who made his first jump from Auckland's Greenhithe Bridge in 1986.During the following years Hackett performed a number of jumps from bridges and other structures (including the Eiffel Tower), building public interest in the sport, and opening the world's first permanent commercial bungee site; the Kawarau Bridge Bungy at Queenstown in the South Island of New Zealand. Hackett remains one of the largest commercial operators, with concerns in several countries.
Despite the inherent danger of jumping from a great height, several million successful jumps have taken place since 1980. This is attributable to bungee operators rigorously conforming to standards and guidelines governing jumps, such as double checking calculations and fittings for every jump. As with any sport, injuries can still occur (see below), and there have been fatalities. A relatively common mistake in fatality cases is to use a cord that is too long. The cord should be substantially shorter than the height of the jumping platform to allow it room to stretch. When the cord reaches its natural length the jumper either starts to slow down or keeps accelerating depending upon the speed of descent. One may not even start to slow until the cord has been stretched a significant amount, because the cord's resistance to distortion is zero at the natural length, and increases only gradually after, taking some time to even equal the jumper's weight. See also Potential energy for a discussion of the spring constant and the force required to distort bungee cords and other spring-like objects.Equipment
The elastic rope first used in bungee jumping, and still used by many commercial operators, is factory-produced braided shock cord. This consists of many latexsouthern-hemisphere operators, use unbraided cords in which the latex strands are exposed (pictured at right). These give a softer, longer bounce and can be home-produced. strands enclosed in a tough outer cover. The outer cover may be applied when the latex is pre-stressed, so that the cord's resistance to extension is already significant at the cord's natural length. This gives a harder, sharper bounce. The braided cover also provides significant durability benefits. Other operators, including A J Hackett and most
Although there is a certain elegance in using only a simple ankle attachment, accidents in which participants became detached led many commercial operators to use a body harness, if only as a backup for an ankle attachment. Body harnesses are generally derived from climbing equipment rather than parachute equipment.Retrieval methods vary according to the site used. Mobile cranes provide the greatest recovery speed and flexibility, the jumper being lowered rapidly to ground level and detached. Many other mechanisms have been devised according to the nature of the jump platform and the need for a rapid turn-around.
The highest jump
In August 2005, AJ Hackett added a SkyJump to the Macau Tower, making it the world's highest jump at 233 metres (764 ft).The SkyJump did not qualify as the world's highest bungee as it is not strictly speaking a bungee jump, but instead what is referred to as a 'Decelerator-Descent' jump, using a steel cable and decelerator system, rather than an elastic rope. On 17 December 2006, The Macau Tower started operating a proper bungee jump, which became the "Highest Commercial Bungee Jump In The World" according to the Guinness Book of Records. The Macau Tower Bungy does have a "Guide cable" system which limits swing (the jump is very close to the structure of the tower itself) but does not have any effect on the speed of descent, so this still qualifies the jump for the World Record.There is another commercial bungee jump currently in operation which is just 13m smaller, at 220 metres (720 ft). This jump, which is made without guide ropes, is located near Locarno, Switzerland and takes place from the top of the Verzasca DamJames Bond film GoldenEye. (pictured). This jump was prominently featured in the opening scene of the
The Bloukrans Bridge in South Africa and the Verzasca Dam jumps are pure freefall swinging bungee from a single cord.
Bloukrans Bridge was opened in 1997 and uses a pendulum bungee system. It is 216m high, from the platform to the river below.Guinness only records jumps from fixed objects to guarantee the accuracy of the measurement. John Kockleman however recorded a 2,200-foot (670 m) bungee jump from a hot air balloon in California in 1989. In 1991 Andrew Salisbury jumped from 9,000 feet (2,700 m) from a helicopter over Cancun for a television program and with Reebok sponsorship. The full stretch was recorded at 3,157 feet (962 m). He landed safely under parachute.
One commercial jump higher than all others is at the Royal Gorge Bridge in Colorado. The height of the platform is 321 metres (1,053 ft). However, this jump is rarely available, as part of the Royal Gorge Go Fast Games—first in 2005, then again in 2007. In popular culture
Several major movies have featured bungee jumps, most famously the opening sequence of the 1995 James Bond film GoldenEye in which Bond makes a jump over the edge of a dam in Russia (in reality the dam is in Switzerland: Verzasca Dam, and the jump was genuine, not an animated special effect).
It appears in the title of the South Korean film Bungee Jumping of Their Own (Beonjijeompeureul hada 번지점프를 하다, 2001), although it does not play a large part in the film.
In 1986, the BBC TV program The Late, Late Breakfast Show, presented by Noel Edmonds, was taken off the air after a volunteer for its 'Whirly Wheel' live stunt section, Michael Lush, was killed while rehearsing a bungee jump.In the 1982 Judge Dredd story 'Criminal Heights', published in the Daily Star, bungee jumping was portrayed as the next 'craze' to catch on in the City.
A fictional proto-bungee jump is a plot point in the Michael Chabon novel The Amazing Adventures of Kavalier and Clay.
In the film Selena, in which Jennifer Lopez played Selena Quintanilla-Perez, she is shown bungee jumping at a carnival. This is an actual event which took place shortly before Selena's death in 1995.
Variations
In "Catapult" (Reverse Bungee or Bungee Rocket) the 'jumper' starts on the ground. The jumper is secured and the cord stretched, then released and shooting the jumper up into the air. This is often achieved using either a crane or a hoist attached to a (semi-)perma structure. This simplifies the action of stretching the cord and later lowering the participant to the ground.
"Twin Tower" is similar with two oblique cords.
Bungy Trampoline uses, as its name suggests, elements from bungy and trampolining. The participant begins on a trampoline and is fitted into a body harness, which is attached via bungy cords to two high poles on either side of the trampoline. As they begin to jump, the bungy cords are tightened, allowing a higher jump than could normally be made from a trampoline alone.
Bungee Running involves no jumping as such. It merely consists of, as the name suggests, running along a track with a bungee cord attached. One often has a velcro-backed marker which is used to mark how far the runner got before the bungee cord pulled back.
Bungee jumping off a ramp. Two rubber cords - the "bungees" - are tied around the participants waist to a harness. Those bungee cords are linked to steel cables along which they can slide thanks to stainless pulleys. The participants ride bike, sled or ski before jumping.
Thierry Devaux performs during his bungee jumps an aesthetical and creative move akin to dance or skating. . He performs 8 to 12 acrobatic figures during two-hour training with the help of his Jumar or with a winch to lift him up . He is also the inventor of a more ethical technique by directly using his elastic cord to climb up. . He stopped counting his jumps after the thousandth one, after sixteen years of training. He did six figures from the Eiffel Tower , nine figures for the Olympic Games , six figures from the Golden Gate Bridge and eight figures from the Brooklyn Bridge. After four attempts, he missed his three acrobatic jumps when he was landing on the torch of Statue of Liberty
Safety and possible injury
There is a wide spectrum of possible injuries during a jump. One can be injured during a jump if the safety harness fails, the cord elasticity is miscalculated, or the cord is not properly connected to the jump platform. In most cases this is a result of human error in the form of mishandled harness preparation. Another major injury is if the jumper experiences cord entanglement with their own body. Other injuries include eye trauma,rope burn, uterine prolapse, dislocations, bruises, whiplash, pinched fingers and back injury.
Age, equipment, experience, location and weight are some of the factors, and nervousness can exacerbate eye traumas.
In 1997, Laura Patterson, one of a 16-member professional bungee jumping team, died of massive cranial trauma when she jumped from the top level of the Louisiana Superdome with improperly handled bungee cords and collided head-first into the concrete-based playing field. She was practising for an exhibition intended to be performed during the halftime show of Super Bowl XXXI. The bungee jumping portion of the show was removed from the program and a commemoration of Patterson was added.
