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  • Other Sources  (1,345)
  • NASA Technical Reports  (1,345)
  • Bibliography on Seismology
  • AIRCRAFT  (1,345)
  • 2005-2009
  • 1970-1974  (1,345)
Collection
  • Other Sources  (1,345)
Source
  • NASA Technical Reports  (1,345)
  • Bibliography on Seismology
Keywords
Years
Year
  • 1
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    Comparison of aerodynamic performance of several STOL concepts (1972)
    In:  CASI
    Details
    Publication Date: 2005-11-30
    Description: Wind tunnel tests to determine the aerodynamic characteristics of basically similar short takeoff aircraft were conducted. The investigations were designed to provide data for a systematic direct comparison of five of the concepts considered. The configurations of the five models are illustrated and described. The aerodynamic data are presented in the form of graphs. It was concluded that the most complex systems require the least amount of net thrust.
    Keywords: AIRCRAFT
    Type: NASA. Langley Res. Center STOL Technol.; p 111-120
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Design integration and noise study for a large STOL augmentor wing transport (1972)
    In:  CASI
    Details
    Publication Date: 2005-11-30
    Description: Analysis, design, experimental static testing, wind-tunnel testing, and design integration studies are used to develop an augmentor wing jet flap configuration for a jet STOL transport aircraft having maximum propulsion and aerodynamic performance with minimum noise generation. The program has three basic elements: (1) static testing of a scale wing section to demonstrate augmentor performance and noise characteristics; (2) two-dimensional wind-tunnel testing to determine flight-speed effects on performance, and (3) system design and evaluation that optimizes the complete system and ensures that the design is compatible with the requirements for a large STOL transport having a 500-foot sideline noise of 95 perceived noise decibels (PNdb) or less.
    Keywords: AIRCRAFT
    Type: NASA. Lewis Res. Center Aircraft Engine Noise Reduction; p 291-304
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Quiet engine demonstration (1972)
    In:  CASI
    Details
    Publication Date: 2005-11-30
    Description: A description of the performance test to compare noise output from a quiet engine with acoustic nacelle to the noise output of the JT3D turbofan engine is presented. Tabulations depict comparative thrusts, bypass ratios, core jet velocities, and fan jet velocities for both engines during simulated takeoff and approach performances.
    Keywords: AIRCRAFT
    Type: Aircraft Engine Noise Reduction; p 215-218
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Fan noise suppression (1972)
    In:  CASI
    Details
    Publication Date: 2005-11-30
    Description: The principal suppressor parameters and their relationships have been used to formulate a suppressor design methodology which has been applied to the design of several full-scale suppressors. Tests of these suppressors on several full-scale fans have demonstrated noise reductions of the order of 10 PNdB. The amount of suppression in several instances seems to have been limited by reaching noise floors that are not clearly at the estimated jet noise level but are not far above it. In addition to identifying noise floors, two other areas are considered. The first is attenuation by the fan exhaust suppressors, which seems in most cases to be less than that of the inlet. The second is the effectiveness of outer cowl treatment alone on multiple pure tones. This question relates to whether a high-speed fan can become as quiet as a low-speed fan without a substantial increase in the amount of treatment.
    Keywords: AIRCRAFT
    Type: Aircraft Engine Noise Reduction; p 63-102
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Status of studies in sonic boom (1971)
    In:  CASI
    Details
    Publication Date: 2005-11-27
    Description: Aircraft design, flight characteristics, and atmospheric effects on sonic boom during supersonic and hypersonic flight
    Keywords: AIRCRAFT
    Type: NASA AIRCRAFT SAFETY AND OPERATING PROBL., VOL. 1 1971; P 439-456
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    NASA TECHNICAL REPORTS
  • 6
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    Evaluation of measures of aircraft noise (1971)
    In:  CASI
    Details
    Publication Date: 2005-11-27
    Description: Development of noise measurement units for airport and aircraft noise reduction and psychoacoustic studies
    Keywords: AIRCRAFT
    Type: NASA AIRCRAFT SAFETY AND OPERATING PROBL., VOL. 1 1971; P 429-437
    Format: text
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  • 7
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    Trends in noise control for aircraft gas-turbine power plants (1971)
    In:  CASI
    Details
    Publication Date: 2005-11-27
    Description: Jet aircraft noise sources and reduction from gas turbine engines including jet exhausts, fans, lift devices, and unducted rotors
    Keywords: AIRCRAFT
    Type: NASA AIRCRAFT SAFETY AND OPERATING PROBL., VOL. 1 1971; P 417-427
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Progress in reducing exhaust pollutants from jet aircraft (1971)
    In:  CASI
    Details
    Publication Date: 2005-11-27
    Description: Reductions in smoke level and carbon monoxide emissions resulting from air-assist fuel nozzles in jet aircraft exhaust pollutant tests
    Keywords: AIRCRAFT
    Type: NASA AIRCRAFT SAFETY AND OPERATING PROBL., VOL. 1 1971; P 403-416
    Format: text
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  • 9
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    Preliminary study of airplane-autopilot response to atmospheric turbulence (1971)
    In:  CASI
    Details
    Publication Date: 2005-11-27
    Description: Preliminary study of airplane-autopilot response to atmospheric turbulence while operating in altitude-hold and attitude-hold modes
    Keywords: AIRCRAFT
    Type: NASA AIRCRAFT SAFETY AND OPERATING PROBL., VOL. 1 1971; P 323-334
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    Progress report on the NASA V-G/VGH general aviation program (1971)
    In:  CASI
    Details
    Publication Date: 2005-11-27
    Description: Analysis of 79,000 hours data obtained from NASA V-G/VGH flight recorders installed on 734 general aircraft engaged in eight types of operations
    Keywords: AIRCRAFT
    Type: NASA AIRCRAFT SAFETY AND OPERATING PROBL., VOL. 1 1971; P 347-390
    Format: text
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    NASA TECHNICAL REPORTS
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