The oldest scale plans of human made megastructures are reported in the open access journal PLOS ONE on May 17, 2023. The engravings, dated to between 7,000 and 8,000 years old, depict nearby desert kites, vast structures ...
Archaeology
May 17, 2023
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252
For many years, for all we knew, our solar system was alone in the universe. Then better telescopes began to reveal a treasure trove of planets circling distant stars.
Astronomy
Dec 18, 2019
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430
The persistence of the massive, explosive fissures on the surface of Saturn's sixth-largest moon, Enceladus—despite the moon's astoundingly frigid surface—have remained a mystery for 11 years. Researchers from Princeton ...
Space Exploration
Apr 19, 2016
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473
(PhysOrg.com) -- At any moment, the winds in high-altitude jet streams hold roughly 100 times more energy than all the electricity being consumed on Earth, according to a study by Stanford environmental and climate scientists ...
Energy & Green Tech
Jun 24, 2009
28
0
Illustrations of scientific experiments play a fundamental role in both science education and the dissemination of scientific knowledge to the general public. Confirming the adage that "a picture is worth a thousand words," ...
Education
May 22, 2023
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131
Australia's Letter-winged kite may not be any better at seeing in the dark than its closest, day-hunting relatives.
Plants & Animals
May 25, 2022
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360
A team of researchers with the University of Johannesburg's Palaeo-Research Institute has found multiple instances of desert kites in a part of South Africa. In their paper published in the journal Archaeological and Anthropological ...
Among its many useful traits, the federally endangered snail kite helps wildlife managers gauge whether the Florida Everglades has sufficient water. That's one reason University of Florida scientists closely monitor the birds' ...
Plants & Animals
Aug 9, 2018
0
8
Scientists have discovered an ancient animal that carried its young in capsules tethered to the parent's body like tiny, swirling kites. They're naming it after "The Kite Runner," the 2003 bestselling novel.
Archaeology
Apr 4, 2016
0
24
(Phys.org) —The word "kite" at the Delft University of Technology hardly means summertime fun and recreation. Rather, scientists see "kite" as an important airborne wind technology, with advantages lacking in wind turbines. ...
A kite is a tethered aircraft. The necessary lift that makes the kite wing fly is generated when air (or in some cases water) flows over and under the kite's wing, producing low pressure above the wing and high pressure below it. This deflection also generates horizontal drag along the direction of the wind. The resultant force vector from the lift and drag force components is opposed by the tension of the one or more lines or tethers. The anchor point of the kite line may be static or moving (e.g., the towing of a kite by a running person, boat, free-falling anchors as in paragliders and fugitive parakites or vehicle).
Kites are usually heavier-than-air, but there is a second category of lighter-than-air kite called a kytoon which may be filled with hydrogen, hot air, methane, or helium; these stay aloft with or without wind; at calm they float; at wind they receive lift from buoyancy and aerodynamic lift. Kytoons have been made in toy-scale as well as military large scale.
Kites may be flown for recreation, art or other practical uses. Sport kites can be flown in aerial ballet, sometimes as part of a competition. Power kites are multi-line steerable kites designed to generate large forces which can be used to power activities such as kite surfing, kite landboarding, kite fishing, kite buggying and a new trend snow kiting. Kites towed behind boats can lift passengers which has had useful military applications in the past.
This text uses material from Wikipedia, licensed under CC BY-SA
