Gliding (flight) | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-06-04

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Gliding_flight


00:01:17 1 Aircraft ("gliders")
00:03:47 2 Gliding animals
00:03:56 2.1 Birds
00:04:55 2.2 Mammals
00:07:12 2.3 Fish, reptiles, amphibians and other gliding animals
00:10:17 3 Forces
00:11:24 4 Lift to drag ratio
00:13:04 5 Drag
00:15:28 6 Glide ratio
00:17:23 7 Examples
00:17:33 8 Importance of the glide ratio in gliding flight
00:20:50 9 Soaring
00:21:55 10 See also



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SUMMARY
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Gliding flight is heavier-than-air flight without the use of thrust; the term volplaning also refers to this mode of flight in animals.  It is employed by gliding animals and by aircraft such as gliders. This mode of flight involves flying a significant distance horizontally compared to its descent and therefore can be distinguished from a mostly straight downward descent like with a round parachute.
Although the human application of gliding flight usually refers to aircraft designed for this purpose, most powered aircraft are capable of gliding without engine power. As with sustained flight, gliding generally requires the application of an airfoil, such as the wings on aircraft or birds, or the gliding membrane of a gliding possum. However, gliding can be achieved with a flat (uncambered) wing, as with a simple paper plane, or even with card-throwing. However, some aircraft with lifting bodies and animals such as the flying snake can achieve gliding flight without any wings by creating a flattened surface underneath.