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View video A bird in laser goggles has helped scientists discover a new phenomenon in the physics of flight. Swirling vortices appear in the flow of air that follows a bird’s wingbeat. But for slowly flying birds, these vortices were unexpectedly short-lived, researchers from Stanford University report December 6 in Bioinspiration and Biomimetics. The results could help scientists better understand how animals fly, and could be important for designing flying robots (SN: 2/7/15, p. 1  .To study the complex air currents produced by birds’ flapping wings, cheap jordans online , the researchers trained a Pacific parrotlet, a small species of parrot, to fly through laser light — with the appropriate eye protection, cheap jordans , of course. Study coauthor Eric Gutierrez, who recently graduated from Stanford, built tiny, cheap air jordans , 3-D?printed laser goggles for the bird, http://cheapjordansstock.com , named Obi. Gutierrez and colleagues tracked the air currents left in Obi’s wake by spraying a fine liquid mist in the air, and illuminating it with a laser spread out into a two-dimensional sheet. High-speed cameras recorded the action at 1,000 frames per second. The vortex produced by the bird “explosively breaks up, cheap retro jordans ,” says mechanical engineer David Lentink, a coauthor of the study. “The flow becomes very complex, cheap Authentic jordans , much more turbulent.” Comparing three standard methods for calculating the lift produced by flapping wings showed that predictions didn’t match reality, thanks to the unexpected vortex breakup. BIRD FLIGHT?Using a high-speed camera, scientists captured the swirling vortices produced by a slowly flying bird. Surprisingly, they found that the vortices rapidly dissipated. The unexpected effect suggests that scientists need to rethink methods for calculating the lift produced under such conditions. E, cheap jordan shoes . Gutierrez/Lentink Lab/Stanford Univ, cheap wholesale jordans . http://forum.delpost.r...83604.msg354960#msg354960 http://www.riji001.com...ckforward=1&id=826485 http://www.khjl.com/vb...d.php?p=970155#post970155 |