Results 21 to 30 of about 205,543 (241)
Nature, 1874 IN NATURE, vol. x. p. 147, I observe a letter signed “J Guthrie,” and dated from the Cape, on the subject of the Flight of Birds, and particularly on the “hovering” of birds. It appears that one of your correspondents had referred to my chapter on this subject in the “Reign of Law” as giving a satisfactory explanation of this phenomenon. Mr.
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A Flight Mechanics-Centric Review of Bird-Scale Flapping Flight [PDF]
, 2012 This paper reviews the flight mechanics and control of birds and bird-size aircraft. It is intended to fill a niche in the current survey literature which focuses primarily on the aerodynamics, flight dynamics and control of insect scale flight.
Chung, Soon-Jo +3 more
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EPJ Web of Conferences, 2016 Unlike airplanes birds must have either flapping or oscillating wings (the hummingbird). Only such wings can produce both lift and thrust – two sine qua non attributes of flying.The bird wings have several possibilities how to obtain the same functions ...
Dvořák Rudolf
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Sadhana, 1991 Avian flight has fascinated man from ancient times but it is only in recent years that the efforts of scientists from diverse fields have been able, to some extent, to understand and explain the dynamics of animal flight. This article is based on some observations of birds in the Nellapetu and Pulicat Lake sanctuaries on the east coast of India.
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Review of the Flight Control Method of a Bird-like Flapping-Wing Air Vehicle
Micromachines, 2023 The Bird-like Flapping-wing Air Vehicle (BFAV) is a robotic innovation that emulates the flight patterns of birds. In comparison to fixed-wing and rotary-wing air vehicles, the BFAV offers superior attributes such as stealth, enhanced maneuverability ...
Xiaoqing Fang +6 more
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From collective flight in bird flocks to unmanned aerial vehicle autonomous swarm formation
工程科学学报, 2017 The mission abilities of unmanned aerial vehicles (UAVs) under complex environments will be improved by autonomous swarm formations. The coexistence of multiple aircrafts raises a series of problems, such as growing difficulties in coordinated ...
QIU Hua-xin, DUAN Hai-bin
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Estimating the surface area of birds: using the homing pigeon (Columba livia) as a model
Biology Open, 2014 Estimation of the surface area of the avian body is valuable for thermoregulation and metabolism studies as well as for assessing exposure to oil and other surface-active organic pollutants from a spill.
Cristina R. Perez +2 more
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PLoS ONE, 2023 Experimental characterization of bird flight without instrumenting the animal requires measuring the flow behind the bird in a wind tunnel. Models are used to link the measured velocities to the corresponding aerodynamic forces.
Victor Colognesi +2 more
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Biomechanics of bird flight [PDF]
Journal of Experimental Biology, 2007 SUMMARYPower output is a unifying theme for bird flight and considerable progress has been accomplished recently in measuring muscular, metabolic and aerodynamic power in birds. The primary flight muscles of birds, the pectoralis and supracoracoideus, are designed for work and power output, with large stress (force per unit cross-sectional area) and ...
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Comparing aerodynamic efficiency in birds and bats suggests better flight performance in birds. [PDF]
PLoS ONE, 2012 Flight is one of the energetically most costly activities in the animal kingdom, suggesting that natural selection should work to optimize flight performance.
Florian T Muijres +4 more
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