Results 171 to 180 of about 24,098 (229)

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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Data-driven control of flapping flight

ACM Transactions on Graphics, 2013
We present a physically based controller that simulates the flapping behavior of a bird in flight. We recorded the motion of a dove using marker-based optical motion capture and high-speed video cameras. The bird flight data thus acquired allow us to parameterize natural wingbeat cycles and provide the simulated bird with reference trajectories to ...
Ju, E Ju, Eunjung, Won, J Won, Jungdam, Lee, J Lee, Jehee, Choi, B Choi, Byungkuk, Noh, J Noh, Junyong, Choi, MG Choi, Min Gyu   +5 more
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Is Flapping Flight Aerodynamically Efficient?

32nd AIAA Applied Aerodynamics Conference, 2014
Flapping flight is much less efficient for some insects than previously thought. The induced power factor for flapping wings is discussed in terms of a number of non-ideal effects for hovering and for forward flight. These effects include losses due to non-uniform downwash, wake periodicity and effective disk area.
Nabawy, M.R.A., Crowther, W.J.
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Dragonfly Flight : II. Velocities, Accelerations and Kinematics of Flapping Flight

Journal of Experimental Biology, 1997
ABSTRACT The free flapping flight of the dragonfly Sympetrum sanguineum and the damselfly Calopteryx splendens was filmed in a large flight enclosure at 3000 frames s−1. The wingtip kinematics are described for these flights. Despite the two species being similar in size, the damselfly flew with wingbeat frequencies half those of the ...
JM, Wakeling, CP, Ellington
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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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Flapping Flight

Aeronautical journal (London, England : 1897), 1915
A paper on “Flapping Flight of Aeroplanes ” by the present writer was communicated by the late Professor G. F. FitzGerald to the “ Proceedings ” of the Royal Society (Vol. 64, pp. 420-430) in 1899. At that date much that is now almost common knowledge concerning the mechanics of flight was little thought of, much less understood, practical aviation did
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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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