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naca-rm-l8h23

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National Advisory Committee for Aeronautics, Research Memorandum - Experimental Determination of the Lateral Stability of a Glider Towed by a Single Towline and Correlation with an Approximate Theory

An experimental investigation was made to determine the effects of
various design parameters on the lateral-stability characteristics of a
glider towed by a single towline. The investigation showed that it is
possible to obtain inherent lateral stability with a single towline system.

An approximate theoretical analysis was also made and the results of
calculations made by use of this analysis were compared with the model
flight-test results. Although the theoretical damping results are too
conservative to be of much practical value, the existence of divergences
and the periods of the lateral oscillations are predicted with fair
accuracy.

The Army and Navy have long been interested in towed gliders as a
means of transporting men, material, aerial targets or guided missiles.
One of the major problems connected with the use of towed gliders has
been that of Obtaining lateral stability of the glider on tow- Once
trim conditions had been established, an inherently stable glider towline
system would require no pilot attention and thus glider'pilot fatigue
would be reduced on long flights or under conditions of poor visibility.
In addition, it would make feasible some glider applications that are
now impractical.

In order to obtain lateral stability, various automatic and semi-
automatic devices have been used but these devices are limited in their
application by their complexity and maintenance problems. Glider-
position indicators, as a visual aid to the pilot during blind-flying
conditions, have proved unsatisfactory. Various systems other than a
single line have been proposed. One such system consisting of twin
parallel towlines was studied in a theoretical and experimental investi-
gation in the Langley free-flight tunnel (references 1 and 2). In
general, however, it appears that the most satisfactory solution to the
towed-glider problem would be an inherently stable single-towline system.

Although a considerable amount of experimental and theoretical work has
been conducted in this country and by the British, to date no satisfactory
theory predicting the lateral~stabili_ty characteristics of a glider on a.
single towline has been reported.

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naca-rm-l8h23

  • Version
  • 82 Downloads
  • 1.09 MB File Size
  • 1 File Count
  • April 26, 2017 Create Date
  • April 26, 2017 Last Updated
Scroll for Details

National Advisory Committee for Aeronautics, Research Memorandum - Experimental Determination of the Lateral Stability of a Glider Towed by a Single Towline and Correlation with an Approximate Theory

An experimental investigation was made to determine the effects of
various design parameters on the lateral-stability characteristics of a
glider towed by a single towline. The investigation showed that it is
possible to obtain inherent lateral stability with a single towline system.

An approximate theoretical analysis was also made and the results of
calculations made by use of this analysis were compared with the model
flight-test results. Although the theoretical damping results are too
conservative to be of much practical value, the existence of divergences
and the periods of the lateral oscillations are predicted with fair
accuracy.

The Army and Navy have long been interested in towed gliders as a
means of transporting men, material, aerial targets or guided missiles.
One of the major problems connected with the use of towed gliders has
been that of Obtaining lateral stability of the glider on tow- Once
trim conditions had been established, an inherently stable glider towline
system would require no pilot attention and thus glider'pilot fatigue
would be reduced on long flights or under conditions of poor visibility.
In addition, it would make feasible some glider applications that are
now impractical.

In order to obtain lateral stability, various automatic and semi-
automatic devices have been used but these devices are limited in their
application by their complexity and maintenance problems. Glider-
position indicators, as a visual aid to the pilot during blind-flying
conditions, have proved unsatisfactory. Various systems other than a
single line have been proposed. One such system consisting of twin
parallel towlines was studied in a theoretical and experimental investi-
gation in the Langley free-flight tunnel (references 1 and 2). In
general, however, it appears that the most satisfactory solution to the
towed-glider problem would be an inherently stable single-towline system.

Although a considerable amount of experimental and theoretical work has
been conducted in this country and by the British, to date no satisfactory
theory predicting the lateral~stabili_ty characteristics of a glider on a.
single towline has been reported.

FileAction
naca-rm-l8h23 Experimental Determination of the Lateral Stability of a Glider Towed by a Single Towline and Correlation with an Approximate Theory.pdfDownload 
17,005 Documents in our Technical Library
2450023 Total Downloads

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Newest Additions

NASA-RP-1060 Subsonic Aircraft: Evolution and the Matching of Size to Performance
NASA-RP-1060 Subsonic Aircraft: Evolution and the Matching of Size to Performance
AA-CP-20212-001
AA-CP-20212-001
ADPO10769 Occurrence of Corrosion in Airframes
The purpose of this lecture is to provide an overview ...
MIL-STD-1759 Rivets and Rivet Type Fasteners Preferred for Design
The purpose of this book form standard is to provide ...
MIL-STD-810G Environmental Engineering Considerations and Laboratory Tests
This standard contains materiel acquisition program planning and engineering direction ...