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  • 1
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    Helicopter noise research at the Langley V/STOL tunnel (1978)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The noise generated from a 1/4-scale AH-1G helicopter configuration was investigated in the Langley V/STOL tunnel. Microphones were installed in positions scaled to those for which flight test data were available. Model and tunnel conditions were carefully set to properly scaled flight conditions. Data presented indicate a high degree of similarity between model and flight test results. It was found that the pressure time history waveforms are very much alike in shape and amplitude. Blade slap when it occurred seemed to be generated in about the same location in the rotor disk as on the flight vehicle. If model and tunnel conditions were properly matched, including inflow turbulence characteristics, the intensity of the blade-slap impulse seemed to correlate well with flight.
    Keywords: ACOUSTICS
    Type: Helicopter Acoustics; p 181-204
    Format: application/pdf
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
  • 2
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    Electrolytic Sharpening of Diode-Contact Whiskers (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Phosphor bronze wire pointed without highly-toxic chemical reagents. Phosphor bronze wire to be pointed affixed to metal post held by fixture, such as pin vise. Fixture moved axially by micrometer allows precise control of position of end of wire with respect to surface of pointing solution. Solution consists of 4 weight percent sulfamic acid crystals in deionized water. Dissolution current adjusted via the autotransformer setting.
    Keywords: FABRICATION TECHNOLOGY
    Type: NPO-15789 , NASA Tech Briefs (ISSN 0145-319X); 7; 4; P. 464
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    All-tantalum electrolytic capacitor (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Device uses single-compression tantalum-to-tantalum seal. Single-compression seal allows better utilization of volume within device. As result of all-tantalum case and lengthened cathode, electrical parameters, particularly equivalent series resistance and capacitance stability, improved over silver-cased capacitor.
    Keywords: FABRICATION TECHNOLOGY
    Type: MFS-23462 , NASA Tech Briefs (ISSN 0145-319X); 1; 3; P. 456
    Format: text
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
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