Influence of Wind Shear on the Aerodynamic Characteristics of Airplanes
Author: Dan D. Vicroy
Publisher:
Published: 1988
Total Pages: 68
ISBN-13:
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Author: Dan D. Vicroy
Publisher:
Published: 1988
Total Pages: 68
ISBN-13:
DOWNLOAD EBOOKAuthor: Dan D. Vicroy
Publisher:
Published: 1987
Total Pages: 88
ISBN-13:
DOWNLOAD EBOOKAuthor: Dan D. Vicroy
Publisher:
Published: 1988
Total Pages: 78
ISBN-13:
DOWNLOAD EBOOKThe aerodynamic effect of shear flow through a series of sensitivity studies of the wind velocity gradients and wing planform geometry parameters is investigated and characterized. The wind shear effect is computed using a modified vortex-lattice computer program and characterized through the formulation of wind shear aerodynamic coefficients. The magnitudes if the aerodynamic effects are demonstrated by computation of the resultant change in the aerodynamics of a conventional wing and horizontal stability configuration on a fixed flight path through a simulated microburst. The results indicate that as much as 20 percent of the control authority of the airplane may be required to counteract the wind-shear-induced forces and moments in the microburst environment.
Author: Joseph Gera
Publisher:
Published: 1971
Total Pages: 28
ISBN-13:
DOWNLOAD EBOOKThe present study is an attempt to make an assessment of the influence of wind shear on the longitudinal motion of airplanes. It was assumed that the wind is completely horizontal and its speed varies linearly with altitude. It is shown quantitatively that both glide and climb performance are influenced by wind shear and that trimmed flight at constant airspeed, attitude, and with fixed controls is along a parabolic path relative to the ground. The problem of the landing approach in a wind shear is examined in some detail. Small disturbance theory indicates no wind-shear effect on the short-period motion and the time for the phugoid to damp to half amplitude but the phugoid frequency and damping ratio vary considerably with wind shear. A nondimensional quantity which depends on the wind shear and airspeed is shown to be a fundamental parameter influencing the longitudinal dynamic behavior of the airplane.
Author: Francis M. Payne
Publisher:
Published: 1981
Total Pages: 328
ISBN-13:
DOWNLOAD EBOOKAuthor: National Research Council
Publisher: National Academies Press
Published: 1983-02-01
Total Pages: 124
ISBN-13: 0309034329
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Publisher:
Published: 1983
Total Pages: 76
ISBN-13:
DOWNLOAD EBOOKAuthor: James K. Luers
Publisher:
Published: 1973
Total Pages: 86
ISBN-13:
DOWNLOAD EBOOKA simulation study was conducted to determine the effect of wind shear on aircraft landings. The landing of various type of commercial and military aircraft was digitally simulated starting from an initial altitude of 300 feet. Assuming no pilot feedback during descent, the deviation in touchdown point due to vertical profiles of wind shear was determined. The vertical profiles of wind shear are defined in terms of surface roughness, Z sub 0, and stability, L, parameters. The effects on touchdown due to Z sub 0 and L have been calculated for the different type aircraft. Comparisons were made between the following types of aircraft: (1) C-130E, (2) C-135A, (3) C-141, (4) DC-8, (5) Boeing 747, and (6) an augmentor-wing STOL. In addition, the wind shear effect on touchdown resulting from different locations of the center of gravity and gross weights was also analyzed.
Author: Hamid Bassiri
Publisher:
Published: 1988
Total Pages: 20
ISBN-13:
DOWNLOAD EBOOKAuthor: Margaret M. Curtin
Publisher:
Published: 1979
Total Pages: 202
ISBN-13:
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