Results 121 to 130 of about 587 (163)

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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Optimization of Flap-Bounding Flight

AIAA Atmospheric Flight Mechanics Conference, 2011
Flap-bounding flight which is a flight mode consisting of continually repeated cycles with flapping and non-flapping phases is treated as a periodic optimal control problem. Two modelings of flap-bounding flight are developed. One modeling is based on energy considerations.
Gottfried Sachs, Jakob Lenz, Florian Holzapfel   +2 more
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Aerodynamics of Flapping Flight With Application to Insects

Journal of Experimental Biology, 1951
ABSTRACT General formulae are derived giving the lift, thrust and power when the wing motion is specified. The formulae are applied to twenty-five insects for which quantitative data are available. Average values for lift and drag coefficients, CL and CD, are derived by equating the weight to the vertical force and the thrust to the ...
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Flapping Flight of the Andean Condor in Nature

Journal of Experimental Biology, 1973
ABSTRACT At air speeds approximating to those of equilibrium gliding (14–15 m/sec), flapping by Andean condors acts to reduce sinking speed and does so without increasing forward air speed. Apparently the flapping wing provides lift by increasing the speed of the air striking its surfaces and by twisting at the same time so as to present
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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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Neuromuscular Correlates to the Evolution of Flapping Flight in Birds

Brain, Behavior and Evolution, 2000
The neuromotor pattern (i.e. the onset/offset of muscle contraction within the locomotor cycle) is conserved for some homologous muscles of the tetrapod shoulder but not others in the transition from terrestrial locomotion to flight. Here we test for three shoulder muscles of the European starling <i>(Sturnus vulgaris)</i> to determine ...
G E, Goslow, D, Wilson, S O, Poore
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Identification of flight aerodynamics for flapping-wing microrobots

2013 IEEE International Conference on Robotics and Automation, 2013
Experimentally collected flight dynamics data of flapping-wing microrobots reveals several characteristics that cannot be captured by the information gathered from static experiments. For an insect-sized flapping-wing micro air vehicle with air dampers, we show that a physics-based quasi-steady aerodynamic model is able to predict the flight dynamics ...
Pakpong Chirarattananon, Robert J. Wood
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The Flapping Flight of Birds. II

Journal of the Royal Aeronautical Society, 1927
In a paper in the number of this journal for November, 1925, it was shown that if a flying machine were fitted with wings of standard section and these were flapped in a rhythmical manner, the machine would be supported and propelled, its weight, dimensions and velocity being those of a typical bird; the degree of accuracy attempted in the analysis did
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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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Development of wing‐flapping and flight in normal and flap‐deprived domestic chicks

Developmental Psychobiology, 1981
AbstractLateral flight evoked by dropping appeared 7–9 days after hatching. Drop‐evoked bilaterally symmetrical wing extension and slow, low‐amplitude wing‐flapping were present by Day 1. Flapping rate measured using strobophotography increased up to approximately 13 days.
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