Item Details

Aerodynamic Characteristics of a Powered Semispan Tilting-Shrouded-Propeller VTOL Model in Hovering and Transition Flight

by Kenneth W. Goodson and Kalman J. Grunwald
Format
Book; Government Document; Online; EBook
Published
Washington [D.C.] : National Aeronautics and Space Administration, 1962.
Language
English
Series
NASA Technical Note
Summary
"An investigation of the aerodynamic characteristics of a powered semispan tilting-shrouded-propeller configuration has been conducted in the 17-foot test section of the Langley 300-MPH 7- by 10-foot tunnel. The wing had an aspect ratio of 2.67 (based on wing span of 60 inches), a taper ratio of 0.67, and an NACA 2418 airfoil section with a 15-inch-diameter shrouded propeller mounted on the tip. The test results show that large nose-up pitching moments are obtained at transitional speeds of about 40 knots and duct angle of about 70°. Decelerating flight procedures further increases in the nose-up moment. Ground proximity reduces the nose-up pitching moments. The large nose-up moments can be trimmed by use of duct-exit control vanes. The results show that unloading the duct (shroud) by flying at a wing angle of attack of 15° reduces the power required by about 30 percent at 50 knots. Duct-lip stall produces large increases in power required. The results in general show that full-scale aerodynamic simulation can be made with small-scale wind-tunnel models if duct-lip separation at low Reynolds numbers is avoided."--Summary.
Description
46 p. : ill. ; 26 cm.
Mode of access: Internet.
Notes
  • Document ID: 19620000021.
  • "NASA TN D-981."
  • "Langley Research Center, Langley Air Force Base, Va."
  • "January 1962."
  • Cover title.
  • Includes bibliographical references (p. 14).
Series Statement
NASA technical note ; D-981
Other Forms
Also available from the NASA Technical Reports Server (http://ntrs.nasa.gov/). Address as of 4/11/07: http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19620000021_1962000021.pdf.
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Technical Details

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    a| Aerodynamic characteristics of a powered semispan tilting-shrouded-propeller VTOL model in hovering and transition flight / c| by Kenneth W. Goodson and Kalman J. Grunwald.
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    a| Washington [D.C.] : b| National Aeronautics and Space Administration, c| 1962.
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    a| 46 p. : b| ill. ; c| 26 cm.
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    a| NASA technical note ; v| D-981
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    a| Document ID: 19620000021.
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    a| "NASA TN D-981."
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    a| "Langley Research Center, Langley Air Force Base, Va."
    500
      
      
    a| "January 1962."
    500
      
      
    a| Cover title.
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    a| Includes bibliographical references (p. 14).
    520
      
      
    a| "An investigation of the aerodynamic characteristics of a powered semispan tilting-shrouded-propeller configuration has been conducted in the 17-foot test section of the Langley 300-MPH 7- by 10-foot tunnel. The wing had an aspect ratio of 2.67 (based on wing span of 60 inches), a taper ratio of 0.67, and an NACA 2418 airfoil section with a 15-inch-diameter shrouded propeller mounted on the tip. The test results show that large nose-up pitching moments are obtained at transitional speeds of about 40 knots and duct angle of about 70°. Decelerating flight procedures further increases in the nose-up moment. Ground proximity reduces the nose-up pitching moments. The large nose-up moments can be trimmed by use of duct-exit control vanes. The results show that unloading the duct (shroud) by flying at a wing angle of attack of 15° reduces the power required by about 30 percent at 50 knots. Duct-lip stall produces large increases in power required. The results in general show that full-scale aerodynamic simulation can be made with small-scale wind-tunnel models if duct-lip separation at low Reynolds numbers is avoided."--Summary.
    530
      
      
    a| Also available from the NASA Technical Reports Server (http://ntrs.nasa.gov/). Address as of 4/11/07: http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19620000021_1962000021.pdf.
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    a| Mode of access: Internet.
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    7
    a| Wings. 2| nasat
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    7
    a| Vertical takeoff aircraft. 2| nasat
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    a| Transition flight. 2| nasat
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    7
    a| Transit satellites. 2| nasat
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    a| Shrouds. 2| nasat
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    a| Shrouded propellers. 2| nasat
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    a| Semispan models. 2| nasat
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    a| Powered models. 2| nasat
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    a| Hovering. 2| nasat
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    7
    a| Ductility. 2| nasat
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    a| Ducted fans. 2| nasat
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    a| Aerodynamics. 2| nasat
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    7
    a| Aerodynamic characteristics. 2| nasat
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    a| Grunwald, Kalman J.
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    a| United States. b| National Aeronautics and Space Administration.
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    a| Langley Research Center.
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    b| UIU c| UIUC d| 20141113 s| google u| uiug.30112106914838 y| 1962 r| pd q| bib

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