martes, 17 de noviembre de 2009
skydiving
this is another extreme sport it called parachuting or skydivingA typical jump involves individuals jumping out of an aircraft (usually an airplane, but sometimes a helicopter or even the gondola of a balloon), at approximately 4,000 meters (around 13,000 feet) altitude, and free-falling for a period of time (about a minute)[1] before activating a parachute to slow the landing down to safe speeds (about 5 to 7 minutes).
When the parachute opens (usually the parachute will be fully inflated by 2,500 feet) the jumper can control the direction and speed with toggles on the end of steering lines attached to the trailing edge of the parachute, and can aim for the landing site and come to a relatively gentle stop. All modern sport parachutes are self-inflating "ram-air" wings that provide control of speed and direction similar to the related paragliders. Purists in either sport would note that paragliders have much greater lift and range, but that parachutes are designed to absorb the stresses of deployment at terminal velocity.
By manipulating the shape of the body a skydiver can generate turns, forward motion, backwards motion, and even lift.
watch this video
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