Item Details

An Investigation of the Effect of Downwash From a VTOL Aircraft and a Helicopter in the Ground Environment

by Thomas C. O'Bryan
Format
Book; Government Document; Online; EBook
Published
Washington, [D.C.] : National Aeronautical and Space Administration, 1961.
Language
English
Variant Title
Investigation of the effect of downwash from a vertical takeoff and landing aircraft and a helicopter in the ground environment
Series
NASA Technical Note
Summary
Dynamic-pressure measurement, in ground effect , have been obtained about a single-rotor helicopter and a dual-propeller VTOL aircraft. The results indicate that the slipstream dynamic pressure along the ground, some distance from the center of rotation, is not a function of disk loading but merely a function of the gross weight or thrust of the aircraft. Furthermore, for a given gross weight the thickness of this is out-ward flowing sheet of air is less for a small-diameter propeller (higher disk loading propeller).
Description
19 p. : ill. ; 26 cm.
Mode of access: Internet.
Notes
  • Document ID: 20040008178.
  • "NASA TN D-977."
  • "Langley Research Center, Langley Air Force Base, Va."
  • "October 1961."
  • Cover title.
  • Includes bibliographical references (p. 7).
Series Statement
NASA technical note ; D-977
Logo for No Copyright - United StatesNo Copyright - United States
Technical Details

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    a| An investigation of the effect of downwash from a VTOL aircraft and a helicopter in the ground environment / c| by Thomas C. O'Bryan.
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    a| Investigation of the effect of downwash from a vertical takeoff and landing aircraft and a helicopter in the ground environment
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    a| Washington, [D.C.] : b| National Aeronautical and Space Administration, c| 1961.
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    a| 19 p. : b| ill. ; c| 26 cm.
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    a| Document ID: 20040008178.
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    a| "NASA TN D-977."
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    a| "Langley Research Center, Langley Air Force Base, Va."
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    a| "October 1961."
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    a| Cover title.
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    a| Includes bibliographical references (p. 7).
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    a| Dynamic-pressure measurement, in ground effect , have been obtained about a single-rotor helicopter and a dual-propeller VTOL aircraft. The results indicate that the slipstream dynamic pressure along the ground, some distance from the center of rotation, is not a function of disk loading but merely a function of the gross weight or thrust of the aircraft. Furthermore, for a given gross weight the thickness of this is out-ward flowing sheet of air is less for a small-diameter propeller (higher disk loading propeller).
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    a| Mode of access: Internet.
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    a| Vertically rising aircraft.
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    a| Downwash (Aerodynamics)
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    a| Langley Research Center.
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