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  • AERODYNAMICS
  • GEOPHYSICS
  • LUNAR AND PLANETARY EXPLORATION
  • METEOROLOGY AND CLIMATOLOGY
  • 1980-1984
  • 1950-1954  (3)
  • 1925-1929
  • 1950  (3)
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Years
  • 1980-1984
  • 1950-1954  (3)
  • 1925-1929
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  • 1
    Publication Date: 2019-06-28
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: NACA-TN-2234
    Format: application/pdf
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  • 2
    Publication Date: 2019-06-28
    Description: A photomicrographic technique for investigating eupercooled. water droplets has been devised and. used. to determine the spontaneous freezing temperatures of eupercooled. water droplets of the size ordinarily found. in the atmosphere. The freezing temperatures of 4527 droplets ranging from 8.75 to 1000 microns in diameter supported on a platinum surface and 571 droplets supported on copper were obtained. The average spontaneous freezing temperature decreased with decrease in the size of the droplets. The effect of size on the spontaneous freezing temperature was particularly marked below 60 microns. Frequency-distribution curves of the spontaneous freezing temperatures observed for droplets of a given size were obtained. Although no droplet froze at a temperature above 20 0 F, all droplets melted at 32 F. Results obtained with a copper support did not differ essentially from those obtained with a platinum surface.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: NACA-TN-2142
    Format: application/pdf
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  • 3
    Publication Date: 2019-06-27
    Description: The problem of the minimum induced drag of wings having a given lift and a given span is extended to include cases in which the bending moment to be supported by the wing is also given. The theory is limited to lifting surfaces traveling at subsonic speeds. It is found that the required shape of the downwash distribution can be obtained in an elementary way which is applicable to a variety of such problems. Expressions for the minimum drag and the corresponding spanwise load distributions are also given for the case in which the lift and the bending moment about the wing root are fixed while the span is allowed to vary. The results show a 15-percent reduction of the induced drag with a 15-percent increase in span as compared with results for an elliptically loaded wing having the same total lift and bending moment.
    Keywords: AERODYNAMICS
    Type: NACA-TN-2249 , Collected Works of Robert T. Jones; p 539-556
    Format: application/pdf
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