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  • 1
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    Structural integrity of wind tunnel wooden fan blades (1991)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Information is presented which was compiled by the NASA Inter-Center Committee on Structural Integrity of Wooden Fan Blades and is intended for use as a guide in design, fabrication, evaluation, and assurance of fan systems using wooden blades. A risk assessment approach for existing NASA wind tunnels with wooden fan blades is provided. Also, state of the art information is provided for wooden fan blade design, drive system considerations, inspection and monitoring methods, and fan blade repair. Proposed research and development activities are discussed, and recommendations are provided which are aimed at future wooden fan blade design activities and safely maintaining existing NASA wind tunnel fan blades. Information is presented that will be of value to wooden fan blade designers, fabricators, inspectors, and wind tunnel operations personnel.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TM-104059 , NAS 1.15:104059
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Improving Large-Scale Testing Capability by Modifying the 40- by 80-ft Wind Tunnel (1979)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Interagency studies conducted during the last several years have indicated the need to Improve full-scale testing capabilities. The studies showed that the most effective trade between test capability and facility cost was provided by re-powering the existing Ames Research Center 40- by 80-ft Wind Tunnel to Increase the maximum speed from about 100 m/s (200 knots) lo about 150 m/s (300 knots) and by adding a new 24- by 37-m (80- by 120-ft) test section powered for about a 50-m/s (100-knot) maximum speed. This paper reviews the design of the facility, a few or its capabilities, and some of its unique features.
    Keywords: Research and Support Facilities (Air)
    Type: AIAA Paper 77-587R , V/STOL; Jun 06, 1977 - Jun 08, 1977; Moffett Field, CA; United States|Journal Of Aircraft; 16; 8; 571-575
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    A Wind-Tunnel Investigation of a 4-Foot-Diameter Ducted Fan Mounted on the Tip of a Semispan Wing (1961)
    In:  CASI
    Details
    Publication Date: 2019-08-15
    Description: Power, wing angle of attack, and the angle of the duct relative to the wing were varied to achieve a specified lift and thrust for a forward velocity range from 0 to 140 knots. In this manner a so-called transition program of steady-state conditions was defined over the velocity range. It was found-that large pitch-up moments resulted when the ducted fan was operated at an angle of attack to the air stream. A deflected vane installed in the high-energy air at the duct exit was helpful in reducing these pitch-up moments. Large downwash angles were induced by the ducted fan at a selected horizontal-tail location. The possibility of using guide vanes in the duct inlet to vary thrust for the purpose of roll control at low forward speeds was examined.The maximum incremental thrust available at zero forward velocity was found to be 11% of the total thrust required at that speed.
    Keywords: Aerodynamics
    Type: NASA-TN-D-776
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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