{{infobox aircraft begin |name | Paraglider |image |caption Paraglider over Ölüdeniz, Fethiye, Turkey. }} |
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Paragliding is a recreational and competitive flying sport. A paraglider is a free-flying, foot-launched glider aircraft. The pilot sits in a harness suspended below a fabric wing, whose shape is formed by its suspension lines and the pressure of air entering vents in the front of the wing.
Despite not having an engine, paraglider flights can last many hours and cover many hundreds of kilometres, though flights of 1-2 hours and covering a few tens of kilometres are more the norm. By skilful exploitation of sources of lift the pilot may gain height, often climbing to a few kilometres over the surrounding countryside.
Paragliders are unique among aircraft in being easily portable. The complete equipment packs into a rucksack and can be carried on the pilot's back, in a car or on public transport. In comparison with other air sports this substantially simplifies travel to a suitable take off spot, selection of a landing place and return travel.
In 1954, Walter Neumark predicted (in an article in ''Flight'' magazine) a time when a glider pilot would be “able to launch himself by running over the edge of a cliff or down a slope ... whether on a rock-climbing holiday in Skye or ski-ing in the Alps”.
In 1961, the French engineer Pierre Lemoigne produced improved parachute designs which led to the Para-Commander. The ‘PC’, had cut-outs at the rear and sides that enabled it to be towed into the air and steered – leading to parasailing/parascending.
Sometimes credited with the greatest development in parachutes since Leonardo da Vinci, the American Domina Jalbert invented the Parafoil which had sectioned cells in an aerofoil shape; an open leading edge and a closed trailing edge, inflated by passage through the air – the ''ram-air'' design. He filed US Patent 3131894 on January 10, 1963.
Meanwhile, David Barish was developing the Sail Wing for recovery of NASA space capsules – “slope soaring was a way of testing out ... the Sail Wing”. After tests on Hunter Mountain, New York in September 1965, he went on to promote ‘slope soaring’ as a summer activity for ski resorts (apparently without great success). NASA originated the term ‘paraglider’ in the early 1960s, and ‘paragliding’ was first used in the early 1970s to describe foot-launching of gliding parachutes.
In 1971, Steve Snyder marketing the first wing : Paraplane.
Author Walter Neumark wrote ''Operating Procedures for Ascending Parachutes'', and he and a group of enthusiasts with a passion for tow-launching ‘PCs’ and ram-air parachutes eventually broke away from the British Parachute Association to form the British Association of Parascending Clubs (BAPC) in 1973. Authors Patrick Gilligan (Canada) and Bertrand Dubuis (Switzerland) wrote the first flight manual "The Paragliding Manual" in 1985, officially coining the word Paragliding.
These threads were pulled together in June 1978 by three friends Jean-Claude Bétemps, André Bohn and Gérard Bosson from Mieussy Haute-Savoie, France. After inspiration from an article on ‘slope soaring’ in the ''Parachute Manual'' magazine by parachutist & publisher Dan Poynter, they calculated that on a suitable slope, a ‘square’ ram-air parachute could be inflated by running down the slope; Bétemps launched from Pointe du Pertuiset, Mieussy, and flew 100 m. Bohn followed him and glided down to the football pitch in the valley 1000 metres below. ‘Parapente’ (''pente'' being French for slope) was born.
From the 1980s equipment has continued to improve and the number of paragliding pilots has continued to increase. The first World Championship was held in Kössen, Austria in 1989.
The paraglider wing or canopy is usually something known in aeronautical engineering as a ram-air airfoil, or blade parafoil. Such wings comprise two layers of fabric which are connected to internal supporting material in such a way as to form a row of cells. By leaving most of the cells open only at the leading edge, incoming air (ram-air pressure) keeps the wing inflated, thus maintaining its shape. When inflated, the wing's cross-section has the typical teardrop aerofoil shape.
In some modern paragliders (from the 1990s onwards), especially higher performance wings, some of the cells of the leading edge are closed to form a cleaner aerodynamic airfoil. These are known as inflatable parafoils. Like the wingtips, these cells are kept inflated by the internal pressure of the wing.
The pilot is supported underneath the wing by a network of lines. The lines are gathered into two sets as left and right risers. The risers collect the lines in rows from front to back in 2, 3 or 4 rows, distributing load as in a whippletree. The risers are connected to the pilot's harness by two carabiners.
Paraglider wings typically have an area of with a span of , and weigh . Combined weight of wing, harness, reserve, instruments, helmet, etc. is around .
The glide ratio of paragliders ranges from 6:1 for recreational wings, to about 10:1 for modern competition models. For comparison, a typical skydiving parachute will achieve about 3:1 glide. A hang glider will achieve about 15:1 glide. An idling (gliding) Cessna 152 will achieve 9:1. Some sailplanes can achieve a glide ratio of up to 72:1.
The speed range of paragliders is typically , from stall speed to maximum speed. Beginner wings will be in the lower part of this range, high-performance wings in the upper part of the range. The range for safe flying will be somewhat smaller.
Modern paraglider wings are made of high-performance non-porous fabrics such as OLKS from Gelvenor, with Dyneema/Spectra or Kevlar/Aramid lines.
For storage and carrying, the wing is usually folded into a stuffsack (bag), which can then be stowed in a large backpack along with the harness. For pilots who may not want the added weight or fuss of a backpack, some modern harnesses include the ability to turn the harness inside out such that it becomes a backpack.
Tandem paragliders, designed to carry the pilot and one passenger, are larger but otherwise similar. They usually fly faster with higher trim speeds, are more resistant to collapse, and have a slightly higher sink rate compared to solo paragliders.
Since 2000 Juan Salvadori in Argentina has been exploring a variant wing termed Paramontante that involves some firm beams. In April 2009 Pere Casellas has joined in a collaboration with Juan Salvadori for polishing the paramontante. Laboratori d'envol Paramontante
The pilot is loosely and comfortably buckled into a harness which offers support in both the standing and sitting positions. Modern harnesses are designed to be as comfortable as a lounge chair in the sitting position. Many harnesses even have an adjustable 'lumbar support'. A reserve parachute is also typically connected to a paragliding harness.
The primary purpose of parachutes (including skydiving canopies) is for descending, as when jumping out of an aircraft or dropping cargo. In contrast, the primary purpose of paragliders is for ascending. Paragliders are categorized as "ascending parachutes" by canopy manufacturers worldwide, and are designed for "free flying" meaning flight without a tether (for an example of tethered flight, see parasailing). However, in areas without high launch points, paragliders may be towed aloft by a ground vehicle or a stationary winch, after which they are released, creating much the same effect as a mountain launch. Such tethered launches can give a paraglider pilot a higher starting point than many mountains do, offering similar opportunities to catch thermals and to remain airborne by "thermaling" and other forms of lift. As with other forms of free flight, paragliding requires the significant skill and training required for aircraft control, including aeronautical theory, meteorological knowledge and forecasting, personal/emotional safety considerations, adherence to applicable Federal Aviation Regulations (US), and knowledge of equipment care and maintenance.
Birds are highly sensitive to atmospheric pressure, and can tell when they are in rising or sinking air. Humans can sense the acceleration when they first hit a thermal, but cannot detect the difference between constant rising air and constant sinking air. Modern variometers are capable of detecting rates of climb or sink of 1 cm per second.
A variometer indicates climb-rate (or sink-rate) with short audio signals (beeps, which increase in pitch and tempo during ascent, and a droning sound, which gets deeper as the rate of descent increases) and/or a visual display. It also shows altitude: either above takeoff, above sea level, or (at higher altitudes) "flight level".
The main purpose of a variometer is in helping a pilot find and stay in the "core" of a thermal to maximise height gain and, conversely, to indicate when a pilot is in sinking air and needs to find rising air.
The more advanced variometers have an integrated GPS. This is not only more convenient, but also allows one to record the flight in three dimensions. The track of the flight is digitally signed and stored and can be downloaded after the landing. Digitally signed tracks can be used as proof for record claims, replacing the 'old' method of photo documentation.
Paraglider pilots often install in their helmets microphones controlled by a Push-To-Talk (PTT) switch either fixed to the outside of the helmet or strapped to a finger. These radios normally operate on a range of frequencies in different countries—some authorised, some illegal but tolerated. In rare cases, pilots use radios to talk to airport control towers or air traffic controllers. Many pilots carry a cell phone so they can call for pickup should they land away from their point of destination.
It can also be interesting to view a GPS track of a flight when back on the ground, to analyze flying technique. Computer software is available which allows various different analyses of GPS tracks (e.g., CompeGPS, See You).
Other uses include being able to determine drift due to the prevailing wind when flying at altitude, providing position information to allow restricted airspace to be avoided, and identifying one’s location for retrieval teams after landing-out in unfamiliar territory.
More recently, the use of GPS data, linked to a computer, has enabled pilots to share 3D tracks of their flights on Google Earth. This fascinating insight allows comparisons between competing pilots to be made in a detailed 'post-flight' analysis.
Brakes: Controls held in each of the pilot’s hands connect to the trailing edge of the left and right sides of the wing. These controls are called 'brakes' and provide the primary and most general means of control in a paraglider. The brakes are used to adjust speed, to steer (in addition to weight-shift), and flare (during landing).
Weight Shift: In addition to manipulating the brakes, a paraglider pilot must also lean in order to steer properly. Such 'weight-shifting' can also be used for more limited steering when brake use is unavailable, such as when under 'big ears' (see below). More advanced control techniques may also involve weight-shifting.
Speed Bar: A kind of foot control called the 'speed bar' (also 'accelerator') attaches to the paragliding harness and connects to the leading edge of the paraglider wing, usually through a system of at least two pulleys (see animation in margin). This control is used to increase speed, and does so by decreasing the wing's angle of attack. This control is necessary because the brakes can only slow the wing from what is called 'trim speed' (no brakes applied). The accelerator is needed to go faster than this.
More advanced means of control can be obtained by manipulating the paraglider's risers or lines directly:
Problems with “getting down” can occur when the lift situation is very good or when the weather changes unexpectedly. There are three possibilities of rapidly reducing altitude in such situations, each of which has benefits and issues to be aware of:
To reinflate on a low performance glider (e.g., DHV1 rated) it is sufficient to simply release the lines. On higher performance gliders (e.g., DHV1/2 and above) it may be necessary to help the reinflation with weightshifting side to side as braking is dangerous as the angle of attack has increased and the wing is now closer to the stall point (see below).
Whilst big ears are in use, the loading on the remaining flying surface of the glider is increased and it is therefore more stable and less prone to collapse. However there is an increased risk of stalling because 'pulling the ears' increases the angle of attack and reduces the speed of the wing. So while 'ears' and speed bar is a good combination, 'ears' and brake is not - it is best not to use the brakes when the ears are 'in'.
The B-line stall should be initiated with the wing in normal flight (no speed bar; not accelerated). Grasp the B-lines on both sides above the line links and pull them down. There is no need to release the brake toggles while B-stalling. DHV 1/2 wings are very resistant to creasing; the pilot may have to pull on the B-lines with sufficient force to almost lift themselves out of the seat to get the wing to crease. Once the crease is in, it requires less effort to keep it in that it does to initiate it.
The sensation for the pilot when the B-line stall is induced is that the breeze is upwards rather than in your face. Pulling the B-lines even further down will not enhance the sink rate, but can lead to a more unstable flight position.
To recover from the B-line stall, release the B-risers so that the aerofoil shape of the wing is resumed. This will normally be sufficient to resume normal flight, but if the canopy remains in a stall push forward gently on the A-risers to lower the leading edge of the wing and reattach the airflow to the upper surface of the wing.
However, spiral dives put strong G-forces on the wing and glider and must be done carefully and skilfully. The G-forces involved can induce blackouts, and the rotation can produce disorientation. Spiral dives, as with all paragliding techniques, are best learned under expert supervision. Paragliding 'SIV' courses offer a chance to practice spiral dives over water with a rescue boat standing by.
The spiral dive is initiated by pulling the brake on one side and holding it down. Constant pulling on one brake narrows the radius of the turn and forms a spiral rotation in which high sink rates can be reached. As soon as the glider is in a spiral dive (clear increase of sink rate and turn bank), the outside wing should always be stabilised with the outside brake and the desired sink rate should be controlled with great delicacy.
As with all aircraft, launching and landing are done into wind (though in mountain flying, it is possible to launch in nil wind and glide out to the first thermal).
Reverse launches have a number of advantages over a forward launch. It is more straight forward to inspect the wing and check the lines are free as it leaves the ground. In the presence of wind, the pilot can be tugged toward the wing and facing the wing makes it easier to resist this force, and safer in case the pilot slips (as opposed to being dragged backwards). These launches are normally attempted with a reasonable wind speed making the ground speed required to pressurise the wing much lower - the pilot is initially launching while walking forwards as opposed to running backward.
In light winds, some minor running is common. In moderate to medium headwinds, the landings can be without forward speed. With strong winds even going backwards with respect to the ground, but this would usually mean that the conditions got too strong for that glider.
Additionally, at around 4 meters before touching ground, some momentary braking (50% for around 2s) can be applied, then released thus using forward pendular momentum to gain speed for flaring more effectively and approach the ground with minimal vertical speed.
For strong winds during landing two techniques are common:
Once a pilot finds a thermal, he or she begins to fly in a circle, trying to center the circle on the strongest part of the thermal (the "core"), where the air is rising the fastest. Most pilots use a ‘vario’ (vario-altimeter), which indicates climb rate with beeps and/or a visual display, to help ‘core-in’ on a thermal.
Coring: The technique to "core" a thermal is simple: turn tighter as lift decreases, and turn less as lift increases. This ensures you are always flying around the core.
Often there is strong sink surrounding thermals, and there is often also strong turbulence resulting in wing collapses as a pilot tries to enter a strong thermal. Once inside a thermal, shear forces reduce somewhat and the lift tends to become smoother.
Good thermal flying is a skill which takes time to learn, but a good pilot can often "core" a thermal all the way to cloud base.
Competitive flying is done on high performance wings which demand far more skill to fly than their recreational counterparts, but which are far more responsive and offer greater feedback to the pilot, as well as flying faster with better glide ratios.
The current world champion is Andy Aebi of Switzerland; he won the title in February 2009 at Valle de Bravo in Mexico. His predecessor was Bruce Goldsmith.
The safety of the sport is directly influenced by the skill and sense of the pilot. It's important to note that almost all paragliding accidents are the result of pilot error. Paragliding equipment is very well built and, if properly cared for, will almost never fail. As an example, the average paraglider has around 30 lines connected to the risers, yet each one is strong enough to support the full weight of a pilot individually. Aerodynamically, newer paragliders that are not within advanced or competition categories are rated for safety and will tend to recover from most incidents on their own (without pilot intervention).
Given that equipment failure of properly certified paragliding equipment can be considered a non-issue, it is accurate to say that paragliding can be a very safe sport. The individual pilot is the ultimate indicator of his or her personal safety level.
In general:
The following weather is to be avoided:
General safety precautions include pre-flight checks, helmets, harnesses with back protection (foam or air-bag), reserve parachutes, and careful pre-launch observation of other pilots in the air to evaluate conditions.
For pilots who want to stretch themselves into more challenging conditions, advanced ‘SIV’ (''simulation d’incidents en vol'', or simulation of flying incidents) courses are available to teach pilots how to cope with hazardous situations which can arise in flight. Through instruction over radio (above a lake), pilots deliberately induce major collapses, stalls, spins, etc., in order to learn procedures for recovering from them. (As mentioned above, modern recreational wings will recover from minor collapses without intervention).
As always, fatalities and freak accidents can occur, but most properly-trained, responsible pilots risk only minor injuries, such as twisted ankles.
There are several key components to a paragliding pilot certification instruction program. Initial training for beginning pilots usually begins with some amount of ground school to discuss the basics, including elementary theories of flight as well as basic structure and operation of the paraglider.
Students then learn how to control the glider on the ground, practicing take-offs and controlling the wing 'overhead'. Low, gentle hills are next where students get their first short flights, flying at very low altitudes, to get used to the handling of the wing over varied terrain. Special winches can be used to tow the glider to low altitude in areas that have no hills readily available.
As their skills progress, students move on to steeper/higher hills (or higher winch tows), making longer flights, and learning to turn the glider, control the glider's speed, then moving on to 360° turns, spot landings, ‘big ears’ (used to increase the rate of descent for the paraglider), and other more advanced techniques. Training instructions are often provided to the student via radio, particularly during the first flights.
A third key component to a complete paragliding instructional program provides substantial background in the key areas of meteorology, aviation law, and general flight area etiquette.
To give prospective pilots a chance to determine if they would like to proceed with a full pilot training program, most schools offer tandem flights, in which an experienced instructor pilots the paraglider with the prospective pilot as a passenger. Schools often offer pilot's families and friends the opportunity to fly tandem, and sometimes sell tandem pleasure flights at holiday resorts.
Most recognised courses lead to a national licence and an internationally recognised International Pilot Proficiency Information/Identification card. The IPPI specifies five stages of paragliding proficiency, from the entry level ParaPro 1 to the most advance stage 5.
Other records (distance/speed for out-and-return and triangular course) can be seen on the FAI records site
Numbers of actively flying pilots can only be a rough estimate, but France is believed to have the largest number, at around 25,000. Next most active flying countries are Germany, Austria, Switzerland, Japan, and Korea, at around 10,000 – 20,000, followed by Italy, the UK, and Spain with around 5,000 – 10,000. The USA has around 4,500. (All as of 2004).
Category:Adventure travel Category:Aircraft configurations Category:Air sports Category:Individual sports Category:Paragliding
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