Editing Paragliding (section)

=== Wing ===
[[File:Paraglider.svg|thumb|alt=Cross section of a paraglider|Transverse cross section showing parts of a paraglider:{{ordered list| upper surface| lower surface| rib| diagonal rib| upper line cascade| middle line cascade| lower line cascade| risers }}]]

The paraglider wing or canopy is usually what is known in engineering as a ''ram-air [[airfoil]]''. Such wings comprise two layers of fabric that 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 keeps the wing inflated, thus maintaining its shape. When inflated, the wing's cross-section has the typical teardrop aerofoil shape. Modern paraglider wings are made of high-performance non-porous materials such as [[ripstop nylon]].{{efn|e.g. Gelvenor OLKS.}}

In most modern paragliders (from the 1990s onwards), some of the cells of the leading edge are closed to form a cleaner aerodynamic profile. Holes in the internal ribs allow a free flow of air from the open cells to these closed cells to inflate them, and also to the wingtips, which are also closed.<ref>[http://www.para2000.org/wings/index.html Paraglider wing information]; para2000.org</ref> Almost all modern paragliders follow a ''sharknose'' design of the leading edge, by which the inflation opening is not at the front of the wing, but slightly backwards on the underside of the wing, and following a concave shape. This design, resembling the nose of a shark, increases wing stability and stall resistance.<ref>{{Cite web|title=Ozone Sharknose Technology|url=https://www.flyozone.com/paragliders/infozone/ozone-sharknose-technology|access-date=2022-01-28|website=Ozone Paragliders|language=en-US}}</ref><ref>{{cite web |title=SHARK ATTACK: UNDERSTANDING THE SHARKNOSE |date=12 August 2015 |url=https://xcmag.com/magazine-articles/shark-attack-understanding-the-sharknose/ |publisher=Cross Country Magazine |access-date=28 June 2023}}</ref> In modern paragliders, semi-flexible rods made out of plastic or [[nitinol]] are used to give extra stability to the profile of the wing. In high-performance paragliders, these rods extend through most of the length of the upper wing.

The pilot is supported underneath the wing by a network of suspension lines. These start with two sets of risers made of short ({{Convert|40|cm|in|abbr=on|adj=on}}) lengths of strong webbing. Each set is attached to the harness by a [[carabiner]], one on each side of the pilot, and each riser of a set is generally attached to lines from only one row of its side of wing. At the end of each riser of the set, there is a small [[maillon|delta maillon]] with a number (2–5) of lines attached, forming a fan. These are typically {{Convert|4-5|m|ft|abbr=on}} long, with the end attached to 2–4 further lines of around {{Convert|2|m|ft|abbr=on}} m, which are again joined to a group of smaller, thinner lines. In some cases this is repeated for a fourth cascade.

[[File:Parapente3D.svg|thumb|left|alt=3d CAD drawing of a paraglider|3d CAD drawing of a paraglider showing the upper surface in green, the lower surface in blue and the leading edge openings in pink. Only the left half of the suspension cone is shown.]]

The top of each line is attached to small fabric loops sewn into the structure of the wing, which are generally arranged in rows running span-wise (i.e., side to side). The row of lines nearest the front are known as the A lines, the next row back the B lines, and so on.<ref name="PagenPF">{{citation | last=Pagen| first=Dennis| title=Paragliding Flight: Walking on Air| year=1990| publisher=Pagen Books |isbn=0-936310-09-X}}</ref> A typical wing will have A, B, C and D lines, but recently, there has been a tendency to reduce the rows of lines to three, or even two (and experimentally to one), to reduce drag.

Paraglider lines are usually made from [[ultra-high-molecular-weight polyethylene|UHMW polythene]] or [[aramid]].<ref name="PagenPF"/>  Although they look rather slender, these materials are strong and subject to load testing requirements. For example, a single 0.66&nbsp;mm-diameter line (about the thinnest used) can have a breaking strength of {{convert|56|kgf|N|abbr=on}}.<ref>{{citation |url=http://www.ojovolador.com/eng/read/reports/lines/index.htm |title=Paragliding lines |author=Steve Uzochukwu |publisher=Skywings Magazine |url-status=dead |archive-url=https://web.archive.org/web/20111029221547/http://www.ojovolador.com/eng/read/reports/lines/index.htm |archive-date=2011-10-29 }}</ref>

Paraglider wings typically have an area of {{convert|20| - |35|m2|ft2}} with a span of {{convert|8| - |12|m|ft}} and weigh {{convert|3| - |7|kg|lb}}. Combined weight of wing, harness, reserve, instruments, helmet, etc. is around {{convert|12| - |22|kg|lb}}. Ultralight Hike & Fly kits can be lighter than {{convert|5|kg|lb}}.

The [[glide ratio]] of paragliders ranges from 9.3 for recreational wings to about 11.3 for modern competition models,<ref>FAI Website {{cite web |url=http://www.fai.org/hang_gliding/paragliding |title=Paragliding &#124; FAI Hang Gliding and Paragliding Commission - CIVL |access-date=2010-05-06 |url-status=dead |archive-url=https://web.archive.org/web/20100512031116/http://www.fai.org/hang_gliding/paragliding |archive-date=2010-05-12 }}</ref> reaching in some cases up to 13.<ref>U6 at glide ratio competition 2013 http://www.aircross.eu/net/u6-made-longest-flight-at-glide-ratio-competition-2013/?lang=en</ref> For comparison, a typical skydiving parachute will achieve about 3:1 glide. A hang glider ranges from 9.5 for recreational wings to about 16.5 for modern competition models. An idling (gliding) [[Cessna 152]] light aircraft will achieve 9:1. Some [[Glider (sailplane)|sailplanes]] can achieve a glide ratio of up to 72:1.

The speed range of paragliders is typically {{convert|22|-|55|km/h|mph}}, from [[Stall (flight)|stall]] speed to maximum speed. Achieving maximum speed requires the use of speedbar, or trimmers. Without these, and without applying brakes, a paraglider is at its trim speed, which is typically {{convert|32|-|40|km/h|mph}} and often at the best glide ratio, too. High-performance paragliders meant for competitions may achieve faster accelerated flight,<ref>{{cite web |title=HOW FAST IS IT? HOW WE TEST PARAGLIDER SPEEDS |date=20 November 2016 |url=https://xcmag.com/magazine-articles/how-fast-does-it-go-testing-paraglider-speeds/ |publisher=Cross Country Magazine |access-date=28 June 2023}}</ref> as do [[Speed flying and speed riding|speedwings]], due to their small size and different profile.

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. Some modern harnesses include the ability to turn the harness inside out such that it becomes a backpack, saving weight and space.

Paragliders are unique among human-carrying aircraft in being easily portable. The complete equipment packs into a rucksack and can be carried easily on the pilot's back, in a car, or on public transport.<ref name="PagenPF"/> In comparison with other air sports, this substantially simplifies travel to a suitable takeoff spot, the selection of a landing place and return travel.

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.