![]() Hang gliders are highly maneuverable, and their safety record compares well with that of other aviation sports.- Google Patents US3863868A - Hang gliderĭownload PDF Info Publication number US3863868A US3863868A US337895A US33789573A US3863868A US 3863868 A US3863868 A US 3863868A US 337895 A US337895 A US 337895A US 33789573 A US33789573 A US 33789573A US 3863868 A US3863868 A US 3863868A Authority US United States Prior art keywords wing hang hang glider pilot glider Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Such is the efficiency of modern hang gliders that by 1999 the world straight distance record was 308 miles (495 km). Typical sources for such lift occur where wind is deflected upward by a hill or mountain ridge or in columns of warm air called “ thermals,” which are caused by the sun heating the Earth’s surface unevenly. However, by seeking air that is moving upward faster than the aircraft is sinking, skilled pilots can remain aloft for hours. Like all other engineless aircraft, hang gliders use gravity as the source of propulsion, so they are always sinking downward, just as a skier goes downhill. Glide ratios in excess of 20:1 are possible, coupled with top speeds of about 62 miles per hour (100 km per hour), yet they can still launch and land at little more than walking pace. In addition to the now-traditional delta-shaped flexible wings, a new generation of rigid, tailless hang gliders have become popular, in which carbon fibre and other composite materials provide the required blend of lightness and strength. That is, for every three feet traveled forward, they would descend one foot. The original Rogallos with a seated pilot had glide ratios of about 3:1. Aircraft-quality materials began to be used, and glide performance increased steadily through improvements in wing and harness design. SpaceNext50 Britannica presents SpaceNext50, From the race to the Moon to space stewardship, we explore a wide range of subjects that feed our curiosity about space!īy the early 1970s the sport had spread throughout the United States and into Europe.Learn about the major environmental problems facing our planet and what can be done about them! Saving Earth Britannica Presents Earth’s To-Do List for the 21st Century.Britannica Beyond We’ve created a new place where questions are at the center of learning. ![]() 100 Women Britannica celebrates the centennial of the Nineteenth Amendment, highlighting suffragists and history-making politicians.COVID-19 Portal While this global health crisis continues to evolve, it can be useful to look to past pandemics to better understand how to respond today.Student Portal Britannica is the ultimate student resource for key school subjects like history, government, literature, and more.Demystified Videos In Demystified, Britannica has all the answers to your burning questions.This Time in History In these videos, find out what happened this month (or any month!) in history.#WTFact Videos In #WTFact Britannica shares some of the most bizarre facts we can find.Britannica Classics Check out these retro videos from Encyclopedia Britannica’s archives.Britannica Explains In these videos, Britannica explains a variety of topics and answers frequently asked questions.
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