1. The object of this paper is to explain the principles upon which the flapping flight of birds depend and to show how the velocities, power expended and gliding angles can be approximately calculated. The birds are considered to be flying on a horizontal course with constant velocity. The ...
CP Ellington - 《Philosophical Transactions of the Royal Society B Biological Sciences》 被引量: 326发表: 1984年 The evolution of vertebrate flight birds and bats, and in particular of the aerodynamics of flapping wings, clarifies the mechanical changes needed in the course of the evolution of fl...
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An innovative Icelandic company called Flygildi just revealed their latest product, something calledSilent Flyer; We’re talking about a pioneeringwing-flapping dronedesigned to mimic the flight of birds, making it an ideal choice for security and surveillance applications. Unlike conventional drones, ...
Birds fly more efficiently by folding their wings during the upstroke (上行运动), according to a recent study led by Lund University in Sweden. The results could mean that wing-folding is the next step in increasing the advancing efficiency of flapping drones (无人机).Even previous to birds...
But by studying the seal's behaviour,these inoffensive birds have put seal meat at the top of their menu. They pickout the youngest, and wait for them to brave the openwaters of the bay. Then look for someone to pre...
Movements of the wing during upstroke in birds capable of powered flight are more complex than those of downstroke1,2,3. The m. supracoracoideus (SC) is a muscle with a highly derived morphology that is generally considered to be the primary elevator of
Mr.Nguyen,who describes himself as an"enthusiastic independent game maker",also said on the micro-blogging mobile game so far.Coming out in May 2013,the game was free to download and required players to tap the screen to keep the bird in flight....
Her(注:her(she)是带摄像头的秃鹫) birds-eye view reveals manysecrets. This S-shaped island is actually alive! It is made upentirely of lesser flamingos. Flamingos may be the most beautiful and gracefulbirds in Africa, but they spend their lives in the...
3D Unsteady Computations of Flapping Flight in Insects and Fish The flight of insects and birds and the swimming of fish have been sources of continuous fascination throughout the ages. Observation and controlled experi... R Ramamurti,WC Sandberg 被引量: 0发表: 0年 Computational Fluid Dynamics ...