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Aerodynamic And Acoustic Flight Test Results And Results For The Stratospheric Observatory For Infrared Astronomy
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Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781719507127 Total Pages :54 pages Book Rating :4.5/5 (71 download)
Book Synopsis Aerodynamic and Acoustic Flight Test Results and Results for the Stratospheric Observatory for Infrared Astronomy by : National Aeronautics and Space Administration (NASA)
Download or read book Aerodynamic and Acoustic Flight Test Results and Results for the Stratospheric Observatory for Infrared Astronomy written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-05-23 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt: As part of the Stratospheric Observatory for Infrared Astronomy program, a 747SP airplane was modified to carry a 2.5-m telescope in the aft section of the fuselage. The resulting airborne observatory allows for observations above 99 percent of the water vapor in the atmosphere. The open cavity created by the modifications had the potential to significantly affect the airplane in the areas of aerodynamics and acoustics. Several series of flight tests were conducted to clear the operating envelope of the airplane for astronomical observations, planned to be performed between the altitudes of 35,000 ft and 45,000 ft. The flight tests were successfully completed. Cavity acoustics were below design limits, and the overall acoustic characteristics of the cavity were better than expected. The modification did have some effects on the stability and control of the airplane, but these effects were not significant. Airplane air data systems were not affected by the modifications. This paper describes the methods used to examine the aerodynamics and acoustic data from the flight tests and provides a discussion of the flight-test results in the areas of cavity acoustics, stability and control, and air data. Cumming, Stephen B. and Smith, Mark S. and Cliatt, Larry J. and Frederick, Michael A. Armstrong Flight Research Center AERODYNAMIC CHARACTERISTICS; AIR DATA SYSTEMS; FLIGHT TESTS; ACOUSTIC PROPERTIES; OBSERVATORIES; WATER VAPOR; ASTRONOMY; WIND TUNNEL TESTS; FUSELAGES; TELESCOPES
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