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  • Aircraft Design, Testing and Performance; Instrumentation and Photography; Aerodynamics  (1)
  • Fluid Mechanics and Thermodynamics
  • 2010-2014
  • 1985-1989
  • 1945-1949
  • 1940-1944  (2)
  • 1940  (2)
Collection
Keywords
Years
  • 2010-2014
  • 1985-1989
  • 1945-1949
  • 1940-1944  (2)
Year
  • 1
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    Observations in Flight of the Region of Stalled Flow Over the Blades of the Kellett YG-1B Tapered-Blade Autogiro Rotor (1940)
    In:  CASI
    Details
    Publication Date: 2018-06-05
    Description: In conjunction with a series of tests requested by the Army Air corps on a new set of tapered rotor blades, of NACA 230 series section and built for the Kellett YG-1B autogiro, it was convenient to supplement previous studies of the region or stalled flow on rotors by making photographic observations of the flow over the blades in flight. These observations are described in this report. It is shown that the maximum radius stalled on the new rotor increases more rapidly with tip-speed ratio than was true on the rectangular-blade, Gottingen 606 section rotor previously tested on the same ship, though the increase in importance of the stalled region is not as decisive as consideration of the change in section would suggest. The increased loss in the stalled region is felt to be at least a contributing cause in the failure of the new blades to Increase the top speed of the machine.
    Keywords: Aircraft Design, Testing and Performance; Instrumentation and Photography; Aerodynamics
    Format: application/pdf
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
  • 2
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    Preliminary Tests in the NACA Tank to Investigate the Fundamental Characteristics of Hydrofoils (1940)
    In:  CASI
    Details
    Publication Date: 2019-08-26
    Description: This preliminary investigation was made to study the hydrodynamic properties and general behavior of simple hydrofoils. Six 5- by 30-inch plain, rectangular hydrofoils were tested in the NACA tank at various speeds, angles of attack and depths below the water surface. Two of the hydrofoils had sections representing the sections of commonly used airfoils, one had a section similar to one developed Guidoni for use with hydrofoil-equipped seaplane floats, and three had sections designed to have constant chordwise pressure distributions at given values of the lift coefficient for the purpose of delaying the speed at which cavitation begins. The experimental results are presented as curves of the lift and drag coefficients plotted against speed for the various angles of attack and depths for which the hydrofoils were tested. A number of derived curves are included for the purpose of better comparing the characteristics of the hydrofoils and to show the effects of depth. Several representative photographs show the development of cavitation on the the upper surface of the hydrofoils. The results indicate that properly designed hydrofoil sections will have excellent characteristics and that the speed at which cavitation occurs may be delayed to an appreciable extent by the use of suitable sections.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: NACA-SR-158
    Format: application/pdf
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
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