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The influence of vertical wind gradients on the longitudinal motion of airplanes

Author: Joseph Gera; United States. National Aeronautics and Space Administration.; Langley Research Center.
Publisher: Washington, D.C. : National Aeronautics and Space Administration ; Springfield, VA : For sale by the Clearinghouse for Federal Scientific and Technical Information, 1971.
Series: NASA technical note, D-6430.
Edition/Format:   eBook : Document : National government publication : EnglishView all editions and formats
Summary:
The 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  Read more...
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Additional Physical Format: Print version:
Gera, Joseph.
Influence of vertical wind gradients on the longitudinal motion of airplanes.
Washington, D.C. : National Aeronautics and Space Administration ; Springfield, VA : For sale by the Clearinghouse for Federal Scientific and Technical Information, 1971
(OCoLC)642293360
Material Type: Document, Government publication, National government publication, Internet resource
Document Type: Internet Resource, Computer File
All Authors / Contributors: Joseph Gera; United States. National Aeronautics and Space Administration.; Langley Research Center.
OCLC Number: 785164412
Notes: N 71-34022.
Prepared at Langley Research Center.
Reproduction Notes: Electronic reproduction. [S.l.] : HathiTrust Digital Library, 2011. MiAaHDL
Description: 1 online resource (18 pages) : illustrations.
Details: Master and use copy. Digital master created according to Benchmark for Faithful Digital Reproductions of Monographs and Serials, Version 1. Digital Library Federation, December 2002.
Series Title: NASA technical note, D-6430.
Other Titles: NASA TN D-6430
Responsibility: by Joseph Gera.

Abstract:

The 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.

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