Results 261 to 270 of about 207,403 (310)

Predicting Maximum Lift Coefficient for Compound Wings Using Lifting Line Theory

Journal of Aircraft, 2021
In the context of conceptual design there are low-fidelity lifting line models capable of predicting the maximum lift coefficient of trapezoidal twisted wings.
Oliverio E. Velazquez Salazar, François Morency, Julien Weiss   +2 more
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A Theoretical Investigation of the Maximum-lift Coefficient

The Journal of the Royal Aeronautical Society, 1935
The problem of the maximum lift of airfoils has concerned the authors greatly since there were first discovered in the spring of 1932 serious discrepancies in this characteristic between results obtained in the wind tunnel of the Guggenheim Aeronautics Laboratory at the California Institute of Technology (GALCIT) and those reported from certain other ...
Th. von Kármán, Clark B. Millikan
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Predicting Maximum Lift Coefficient for Twisted Wings Using Lifting-Line Theory

45th AIAA Aerospace Sciences Meeting and Exhibit, 2007
A method is presented that allows one to predict the maximum lift coefficient for a wing from knowledge of wing geometry and maximum airfoil section lift coefficient. The method applies to wings of arbitrary planform and includes the effects of twist and sweep.
W. F. Phillips, N. R. Alley
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Soccer ball lift coefficients via trajectory analysis

European Journal of Physics, 2010
We performed experiments in which a soccer ball was launched from a machine while two high-speed cameras recorded portions of the trajectory. Using the trajectory data and published drag coefficients, we extracted lift coefficients for a soccer ball. We determined lift coefficients for a wide range of spin parameters, including several spin parameters ...
John Eric Goff, Matt J Carré
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Constant Lift Coefficient Turns

Journal of Aircraft, 2005
Lateral displacement in a U-turn may become a problem when aircraft position has to be accurately maintained, but the excess thrust is inadequate to sustain level turn of sufficiently small radius. It seems plausible that lateral displacement in a U-turn can be diminished at the expense of mechanical energy: This trade of energy is the subject matter ...
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Congruences for fourier coefficients of lifted siegel modular forms I: Eisenstein lifts

Abhandlungen aus dem Mathematischen Seminar der Universität Hamburg, 2005
The author asks the following question: Does a lifting of modular forms preserve congruences for Fourier coefficients? In this paper he gives an affirmative answer in case of the Eisenstein lift. Let \(S^r_k\) denote the space of cusp forms of even weight \(k> 0\) with respect to the modular group \(\Gamma_r\) of degree \(r\).
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Intelligence Evaluating System of Lift Balancing Coefficient

2015 International Conference on Intelligent Transportation, Big Data and Smart City, 2015
Based on designing the solving algorithm of balancing coefficient, the application system of lift balancing coefficient automatic drawing and printing was develop by using C#.net programming language. On this application system, the graphic chart can be output quickly and accurately by computer.
Dong Haoming, Xu Guifang, Chen Zheng
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Modeling VIV Supression Using Negative Lift Coefficients

Volume 7: CFD and VIV; Offshore Geotechnics, 2011
Vortex-Induced Vibration (VIV) is a complex, non-linear fluid-structure interaction problem with important consequences for offshore risers, tendons and other tubulars. The prevalent approach in the industry is to use semi-empirical formulations to estimate VIV amplitudes, frequencies and the resulting fatigue damage.
Vikas Jhingran, Johnny Vogiatzis
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Transonic aerofoils admitting anomalous behaviour of lift coefficient

The Aeronautical Journal, 2014
AbstractTransonic flow past a Boeing 737 Outboard aerofoil and Whitcomb one with a defected aileron is studied. The flow simulation is based on the system of Reynolds-averaged Navier-Stokes equations. The numerical study demonstrates the existence of free-stream conditions in which small perturbations produce abrupt changes of the lift coefficient ...
A. Kuzmin, A. Ryabinin
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Congruences for Fourier coefficients of lifted Siegel modular forms II: The Ikeda lifts

Abhandlungen aus dem Mathematischen Seminar der Universität Hamburg, 2007
In part I [Abh. Math. Semin. Univ. Hamb. 75, 97--120 (2005; Zbl 1088.11032)], the author studied whether a congruence for Fourier coefficients of Siegel modular forms is preserved under Eisenstein lifts. Now he proves criteria for the preservation of such congruences under two types of lifts [\textit{T. Ikeda}, Ann. Math. (2) 154, No. 3, 641--681 (2001;
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