Parachuting

 

Parachuting, or skydiving, is a method of exiting an aircraft and returning to Earth with the aid of gravity, then slowing down during the last part of the descent by using a parachute. It may or may not involve a certain amount of free-fall, a time during which the parachute has not been deployed and the body gradually accelerates to terminal velocity.

Andre-Jacques Garnerin was the first to make successful descents using a canvas canopy and small basket, tethered beneath a hot-air balloon. The first intentional freefall jump with a ripcord-operated deployment is credited to Leslie Irvin in 1919.

The military developed parachuting technology as a way to save aircrews from emergencies aboard balloons and aircraft in flight, and later as a way of delivering soldiers to the battlefield. Early competitions date back to the 1930s, and it became an international sport in 1952.

Common Uses

Parachuting is performed as a recreational activity, a competitive sport, and is widely considered an extreme sport due to the risk involved. Modern militaries utilize parachuting for the deployment of airborne forces, and special operations forces commonly employ parachuting, especially free-fall parachuting, as a method of insertion. Occasionally forest firefighters, known as "smokejumpers" in the United States of America, use parachuting as a means of rapidly inserting themselves near forest fires in especially remote or otherwise inaccessible areas.

Manually exiting an aircraft and parachuting to safety has been widely used by aviators (especially military aviators), aircrew, and passengers to escape an aircraft that could not otherwise land safely. While this method of escape is relatively rare in modern times, it was commonly used in World War I by military aviators, and utilized extensively throughout World War II. In modern times, the most common means of escape from an aircraft in distress is via an ejection seat system. Said system is usually operated by the pilot, aircrew member, or passenger, by engaging an activation device manually. In most designs, this will lead to the seat being propelled out of and away from the aircraft carrying the occupant with it, by means of either an explosive charge or a rocket propulsion system. Once clear of the aircraft, the ejection seat will deploy a parachute, although some older models entrusted this step to manual activation by the seat's occupant.
Safety

Despite the perception of danger, fatalities are rare. About 21 skydivers are confirmed killed each year in the US, roughly one death for every 150,000 jumps (about 0.0007%).
In the US and in most of the western world skydivers are required to carry two parachutes. The reserve parachute must be periodically inspected and re-packed (whether used or not) by a certificated parachute rigger (in the US, an FAA certificated parachute rigger). Many skydivers use an automatic activation device (AAD) that opens the reserve parachute at a pre-determined altitude if it detects that the skydiver is still in free fall. Depending on the country, AADs are often mandatory for new jumpers, and/or required for all jumpers regardless of their experience level. Most skydivers wear a visual altimeter, and an increasing number also use audible altimeters fitted to their helmet.

Injuries and fatalities occurring under a fully functional parachute usually happen because the skydiver performed unsafe maneuvers or made an error in judgment while flying their canopy, typically resulting in a high speed impact with the ground or other hazards on the ground. One of the most common sources of injury is a low turn under a high-performance canopy and while swooping. Swooping is the advanced discipline of gliding at high speed parallel to the ground during landing.

Changing wind conditions are another risk factor. In conditions of strong winds, and turbulence during hot days the parachutist can be caught in downdrafts close to the ground. Shifting winds can cause a crosswind or downwind landing which have a higher potential for injury due to the wind speed adding to the landing speed.

Another risk factor is that of "canopy collisions", or collisions between two or more skydivers under fully inflated parachutes. Canopy collisions can cause the jumpers' inflated parachutes to entangle with each other, often resulting in a sudden collapse (deflation) of one or more of the involved parachutes. When this occurs, the jumpers often must quickly perform emergency procedures (if there is sufficient altitude to do so) to "cut-away" (jettison) from their main canopies and deploy their reserve canopies. Canopy collisions are particularly dangerous when occurring at altitudes too low to allow the jumpers adequate time to safely jettison their main parachutes and fully deploy their reserve parachutes.

Equipment failure rarely causes fatalities and injuries. Approximately one in 750 deployments of a main parachute result in a malfunction. Ram-air parachutes typically spin uncontrollably when malfunctioning, and must be jettisoned before deploying the reserve parachute. Reserve parachutes are packed and deployed differently; they are also designed more conservatively and built and tested to more exacting standards so they are more reliable than main parachutes, but the real safety advantage comes from the probability of an unlikely main malfunction multiplied by the even less likely probability of a reserve malfunction. This yields an even smaller probability of a double malfunction although the possibility of a main malfunction that cannot be cutaway causing a reserve malfunction is a very real risk.

Parachuting disciplines such as BASE jumping or those that involve equipment such as wing suit flying and sky surfing have a higher risk factor due to the lower mobility of the jumper and the greater risk of entanglement. For this reason these disciplines are generally practiced by experienced jumpers.

Depictions in commercial films – notably Hollywood action movies – usually overstate the dangers of the sport. Often, the characters in such films are shown performing feats that are physically impossible without special effects assistance. In other cases, their practices would cause them to be grounded or shunned at any safety-conscious drop zone or club. USPA member drop zones in the US and Canada are required to have an experienced jumper act as a "safety officer" (in Canada DSO – Drop Zone Safety Officer; in the U.S. S&TA – Safety and Training Advisor) who is responsible for dealing with jumpers who violate rules, regulations, or otherwise act in a fashion deemed unsafe by the appointed individual.

In many countries, either the local regulations or the liability-conscious prudence of the drop zone owners require that parachutists must have attained the age of majority before engaging in the sport.

BASE jumping

 

BASE jumping, also sometimes written as B.A.S.E. jumping, is parachuting or wingsuit flying from a fixed structure or cliff. "BASE" is an acronym that stands for four categories of fixed objects from which one can jump: building, antenna, span, and Earth (cliff). Due to the lower altitudes of the jumps, BASE jumping is significantly more dangerous than skydiving from a plane. In the U.S., BASE jumping is currently regarded by many as a fringe extreme sport or stunt. In some jurisdictions or locations, BASE jumping is prohibited or illegal; in some places, however, it is permitted. BASE jumping became known to the wider public by depictions of BASE jumping in a number of action movies.
History

The acronym "B.A.S.E." (now more commonly "BASE") was coined by filmmaker Carl Boenish, his wife Jean Boenish, Phil Smith, and Phil Mayfield. Carl Boenish was the catalyst behind modern BASE jumping, and in 1978, he filmed the first BASE jumps to be made using ram-air parachutes and the freefall tracking technique (from El Capitan, in Yosemite National Park). While BASE jumps had been made prior to that time, the El Capitan activity was the effective birth of what is now called BASE jumping.

BASE numbers are awarded to those who have made at least one jump from each of the four categories (buildings, antennas, spans and earth). When Phil Smith and Phil Mayfield jumped together from a Houston skyscraper on 18 January 1981, they became the first to attain the exclusive BASE numbers (BASE #1 and #2, respectively), having already jumped from an antenna, spans, and earthen objects. Jean and Carl Boenish qualified for BASE numbers 3 and 4 soon after. A separate "award" was soon enacted for Night BASE jumping when Mayfield completed each category at night, becoming Night BASE #1, with Smith qualifying a few weeks later.

Faust Vrancic is widely believed to have performed a parachute jumping experiment for real and, therefore, to be the first man to build and test a parachute: according to the story passed on, Veranzio, in 1617, then over sixty-five years old, implemented his design and tested the parachute by jumping from St Mark's Campanile in Venice. It is generally added that this event were documented some 30 years later in a book Mathematical Magick or, the Wonders that may be Performed by Mechanical Geometry (London, 1648) written by John Wilkins, the secretary of the Royal Society in London.

However, these and other sporadic incidents were one-time experiments, not the systematic pursuit of a new form of parachuting. After 1978, the filmed jumps from El Capitan were repeated, not as a publicity exercise or as a movie stunt, but as a true recreational activity. It was this that popularised BASE jumping more widely among parachutists. Carl Boenish continued to publish films and informational magazines on BASE jumping until his death in 1984 after a BASE-jump off of the Troll Wall. By this time, the concept had spread among skydivers worldwide, with hundreds of participants making fixed-object jumps.

During the early eighties, nearly all BASE jumps were made using standard skydiving equipment, including two parachutes (main and reserve), and deployment components. Later on, specialized equipment and techniques were developed specifically for the unique needs of BASE jumping.

Upon completing a jump from all of the four object categories, a jumper may choose to apply for a "BASE number", which are awarded sequentially. BASE #1 was awarded to Phil Smith of Houston, Texas in 1981. The 1000th application for a BASE number was filed in March 2005 and BASE #1000 was awarded to Matt "Harley" Moilanen of Grand Rapids, Michigan. As of December 2014, over 1,850 BASE numbers have been issued.

BASE jumping is often featured in action movies. The 2002 Vin Diesel film xXx includes a scene where Diesel's character catapults himself off the Foresthill Bridge in an open-topped car, landing safely as the car crashes on the ground. In the movie Lara Croft Tomb Raider: The Cradle of Life, includes the scene in which the main characters jump with wing suits from the IFC Tower in Hong Kong and fly over the Bank of China, finally opening their parachutes to land on a moving freighter. The stunt was done live, with no special effects, by base jumpers Martin Rosén and Per Eriksson, members of the Swedish "Team Bautasten". The scene was filmed by air-to-air camera man Mikael Nordqvist from the same team. Since the 1976 Mount Asgard jump featured in the pre-credits sequence to The Spy Who Loved Me, James Bond movies have featured several BASE jumps, including one from the Eiffel Tower in 1985's A View to a Kill, the Rock of Gibraltar in 1987's The Living Daylights, and in Die Another Day, 2002, Pierce Brosnan as James Bond jumps from a melting iceberg. Of the James Bond jumps only the Mt Asgard and Eiffel Tower jumps were filmed live; the rest were special effects. And in 2005's "Batman Begins", Bruce Wayne uses BASE jumping as inspiration for his memory cloth cape. A series of BASE jumps are featured in the video for a remix of M83's "Lower Your Eyelids to Die With the Sun".

Guinness World Records first listed a BASE jumping record with Carl Boenish's 1984 leap from Trollveggen (Troll Wall) in Norway. It was described as the highest BASE jump. (The jump was made two days before Boenish's death at the same site.) This record category is still in the Guinness book and is currently held by Australians Glenn Singleman and Heather Swan with a jump from Meru Peak in northern India at a starting elevation of 6,604 metres (21,667 ft). On July 8, 2006 Captain Daniel G. Schilling set the Guinness World Record for the most BASE jumps in a twenty-four hour period. Schilling jumped off the Perrine Bridge in Twin Falls, Idaho a record 201 times.

BASE competitions have been held since the early 1980s, with accurate landings or free fall aerobatics used as the judging criteria. Recent years have seen a formal competition held at the 452 metres (1,483 ft) high Petronas Towers in Kuala Lumpur, Malaysia, judged on landing accuracy.
In 2010 North west Norway celebrated with a world record with 53 Base jumpers jumping from a cliff.

Ice climbing

Ice climbing is the activity of ascending inclined ice formations. Usually, ice climbing refers to roped and protected climbing of features such as icefalls, frozen waterfalls, and cliffs and rock slabs covered with ice refrozen from flows of water. For the purposes of climbing, ice can be broadly divided into two spheres, alpine ice and water ice. Alpine ice is found in a mountain environment, usually requires an approach to reach, and is often climbed in an attempt to summit a mountain. Water ice is usually found on a cliff or other outcropping beneath water flows. Alpine ice is frozen precipitation whereas water ice is a frozen liquid flow of water. Most alpine ice is generally one component of a longer route and often less technical, having more in common with standard glacier travel, while water ice is selected largely for its technical challenge. Technical grade is, however, independent of ice type and both types of ice vary greatly in consistency according to weather conditions. Ice can be soft, hard, brittle or tough. Mixed climbing is ascent involving both ice climbing and rock climbing.

Techniques
A climber chooses equipment according to the slope and texture of the ice. For example, on flat ice, almost any good hiking or mountaineering boot will usually suffice, but for serious ice climbing double plastic mountaineering boots or their stiff leather equivalent are usually used, which must be crampon compatible and stiff enough to support the climber and maintain ankle support. On short, low angled slopes, one can use an ice axe to chop steps. For longer and steeper slopes or glacier travel, crampons are mandatory for a safe climb. Vertical ice climbing is done with crampons and ice axes (those specific to vertical ice generally being called technical ice axes, or ice tools); climbers kick their legs to engage the front points of the crampons in the ice, and then swing the axe into the ice above their heads. This technique is known as front pointing. The strength of the ice is often surprising; even if the axe goes in only a centimeter or so it is enough to pull up on. If a climber is leading, they will need to place ice screws as protection on the way up (see climbing system). Most mountaineers would only consider the last scenario true ice climbing; the less steep variations are routine aspects of winter mountaineering.

Some important techniques and practices common in rock climbing that are employed in ice climbing include knowledge of rope systems, tying in, belaying, leading, abseiling, and lowering. Beginners should learn these techniques before attempting to ice climb. It is highly recommended that one acquire knowledge from experts and experienced ice climbers.

Rope systems
Single, double, and twin rope are the three main rope systems used in ice climbing. The single rope system, which is suited for straight climbing routes, is the most commonly used rock climbing system in the world. Also often used in climbing is the double rope system which is a more flexible system than the single rope system. Lastly, the twin rope system, which uses two twin ropes in a single rope system, is used for longer multi-pitch routes. Double and twin rope technique is used more frequently in ice climbing because these systems are more redundant, an important consideration given the number of sharp edges the ice climber carries with him. Impact force on ice is an issue, with double ropes gaining popularity over twins.

Tying in
Tying in entails attaching your rope to the climbing harness. This technique is a must particularly when leading a climb or belaying. A commonly used tie-in knot is the Figure-of-eight follow through, but the Bowline and Thumb (stopper) knot is often preferred, since it is easier to untie when frozen. This technique should be done properly to ensure your safety when ice climbing.