Results 181 to 190 of about 23,906 (216)

The Flapping Flight of Birds

The Journal of the Royal Aeronautical Society, 1925
In connection with gliding flight enough measurements of “ lift ” and “ drag ” have been made to enable us to calculate the conditions for success of an aeroplane fitted with wings of standard sections; but no attempt has been made, as far as the present writer is aware, to ascertain what would happen if a flying machine were fitted with wings of ...
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New model of flap-gliding flight

Journal of Theoretical Biology, 2015
A new modelling approach is presented for describing flap-gliding flight in birds and the associated mechanical energy cost of travelling. The new approach is based on the difference in the drag characteristics between flapping and non-flapping due to the drag increase caused by flapping. Thus, the possibility of a gliding flight phase, as it exists in
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Analysis of Biplane Flapping Flight with Tail

42nd AIAA Fluid Dynamics Conference and Exhibit, 2012
Numerical simulations have been performed to examine the interference effects between an upstream flapping biplane airfoil arrangement and a downstream stationary tail at a Reynolds number of 1000, which is around the regime of small flapping micro aerial vehicles.
Tay, W.B. (author), Bijl, H. (author), Van Oudheusden, B.W. (author)   +2 more
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Flapping Wing Flight Can Save Aerodynamic Power Compared to Steady Flight

Physical Review Letters, 2009
Flapping flight is more maneuverable than steady flight. It is debated whether this advantage is necessarily accompanied by a trade-off in the flight efficiency. Here we ask if any flapping motion exists that is aerodynamically more efficient than the optimal steady motion.
Umberto, Pesavento, Z Jane, Wang
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Aerodynamic Mechanism Research of Flapping Flight

Advanced Materials Research, 2011
Lift makes a vehicle in air and thrust makes advancing. The lift of flapping wing air vehicle is composed of two main parts, flapping lift and advancing lift. The advancing lift of flapping-wing is similar as of fixed-wing, generated mainly by relative velocity and angle of attack. The flapping lift is owned only by flapping wing.
Wen Qing Yang, Bi Feng Song, Wen Ping Song, Zhan Ke Li, Ya Feng Zhang   +4 more
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Computational Investigation of Flapping-Wing Flight

37th AIAA Fluid Dynamics Conference and Exhibit, 2007
An incompressible Navier-Stokes solver is developed for simulating flapping wings at Reynolds numbers of approximately 10-10 in which the governing equations are solved in an immersed boundary framework on fixed Cartesian meshes. In the present implementation, the influence of solid bodies on the flowfield is represented by a secondorder interpolation ...
Brandon Bush, James Baeder
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Propulsion efficiency of flapping flight robots

2017 IEEE International Conference on Cybernetics and Intelligent Systems (CIS) and IEEE Conference on Robotics, Automation and Mechatronics (RAM), 2017
Flapping wing technologies have been successfully applied to robots either flying in the air or gliding through the water owing to the unique advantages of flapping flight under small Re conditions. Propulsion efficiency of flapping-twisting compound motion wings are analyzed in the present study.
Longfei Zhao, Yaoxing Shang, Zongxia Jiao   +2 more
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Aerodynamic Mechanisms of Flapping Flight

2015
The growing need for mobile aerial platforms capable of performing reconnaissance tasks and gathering intelligence in hazardous and physically inaccessible areas has given rise to an increasing interest in the development of micro aerial vehicles (MAVs), in view of their potential capabilities of versatile and highly maneuverable flight.
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On Flapping Flight of Aeroplanes

Aeronautical journal (London, England : 1897), 1899
It has been long known, principally through experiments on soaring, that a large, if not by far the largest, part of the supporting force obtained by birds in regular flight, is probably furnished by upward air pressure on their wings, regarded as planes moving horizontally, with their surfaces slightly inclined to the direction of motion.Langley's ...
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The Problem of Flapping Flight

Aeronautical journal (London, England : 1897), 1921
It is only within the last few decades that it has been possible to conceive of a flying machine operating on the flapping system which would be consistent with mechanical principles. The development of gliding or “ wedge ” flight through the medium of the screw-propelled aeroplane has largely contributed to this result, but it must not be overlooked ...
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