![]() 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.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.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.Demystified Videos In Demystified, Britannica has all the answers to your burning questions.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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