Noun

Singular skydiving

Plural uncountable

skydiving (uncountable)

1. The practice of jumping out of an aircraft and then freefalling, before releasing a parachute.

Derived terms

• formation skydiving
• indoor skydiving
• tandem skydiving

Verb

skydiving

1. Present participle of skydive.

Parachuting, also known as skydiving, is the activity of jumping from enough height to deploy a fabric parachute and land.

The history of skydiving starts with Andre-Jacques Garnerin who made successful parachute jumps from a hot-air balloon in 1797. The military developed parachuting technology as a way to save aircrews from emergencies aboard balloons and aircraft in flight, later as a way of delivering soldiers to the battlefield. Early competitions date back to the 1930s, and it became an international sport in 1951.

Parachuting is performed as a recreational activity and a competitive sport, as well as for the deployment of military personnel Airborne forces and occasionally forest firefighters.

A fixed base operator at a sky diving airport operates one or more aircraft that takes groups of skydivers up for a fee. An individual jumper can go up in a light aircraft such as a Cessna C-172 or C-182. In busier dropping zones (DZ) larger aircraft may be used such as the Cessna Caravan C208, De Havilland Twin Otter DHC6 or Short Skyvan.

A 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) 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.

When leaving an aircraft, for a few seconds a skydiver continues to travel forward as well as down, due to the momentum created by the plane's speed (known as "forward throw"). The perception of a change from horizontal to vertical flight is known as the "relative wind", or informally as "being on the hill". In freefall, skydivers generally do not experience a "falling" sensation because the resistance of the air to their body at speeds above about 50 mph (80 km/h) provides some feeling of weight and direction. At normal exit speeds for aircraft (approx 90 mph (140 km/h)) there is little feeling of falling just after exit, but jumping from a balloon or helicopter can create this sensation. Skydivers reach terminal velocity (around 120 mph (190 km/h) for belly to Earth orientations, 150-200 mph (240–320 km/h) for head down orientations) and are no longer accelerating towards the ground. At this point the sensation is as of a hard wind.

Many Marshall's make their first jump with an experienced and trained instructor - this type of skydive may be in the form of a tandem skydive. During the tandem jump the jumpmaster is responsible for the stable exit, maintaining a stable freefall position, and activating and controlling the parachute. Other training methods include static line, IAD (Instructor Assisted Deployment), and AFF (Accelerated Free fall) also known as Progressive Free-Fall (PFF) in Canada.

At larger dropzones, training in the sport is often conducted by full-time instructors and coaches. Commercial centers often provide year-round availability, larger aircraft, and highly experienced staff.

In areas where winter (or monsoons) gets in the way of year-round operation, commercial skydiving centers are less common and the parachuting activity may be by clubs. These clubs tend to use smaller aircraft. Training may be offered (by instructors who are tested and certified in exactly the same way as their commercial counterparts) in occasional classes or as demand warrants. These clubs tend to be weekend only operations as the majority of the staff have full-time jobs during the week. Club members will often visit larger centers for holidays, events, and for some concentrated exposure to the latest techniques.

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• Dropzone.com
  dropzone.com
  Information for novice and experienced skydivers, including global dropzone and skydivers databases, DZ reviews, skydiving classifieds, safety and training information, and the latest skydiving news.
• The Bodyflight Network
  bodyflight.net
  Website of Bodyflight University dedicated to the vertical wind tunnel industry. News, photos, videos.
• Aerosoftware
  makeithappen.com
  Website offering skydiving software.

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