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  • Other Sources  (3)
  • Aircraft Propulsion and Power  (2)
  • Aircraft Design, Testing and Performance; Instrumentation and Photography; Aerodynamics  (1)
  • 2000-2004
  • 1950-1954
  • 1940-1944  (3)
  • 1935-1939
  • 1940  (3)
Collection
  • Other Sources  (3)
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  • 2000-2004
  • 1950-1954
  • 1940-1944  (3)
  • 1935-1939
Year
  • 1
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    Unknown
    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
    facet.materialart.
    Unknown
    Experimental Determination of Exhaust Gas Thrust, Special Report (1940)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: This investigation presents the results of tests made on a radial engine to determine the thrust that can be obtained from the exhaust gas when discharged from separate stacks and when discharged from the collector ring with various discharge nozzles. The engine was provided with a propeller to absorb the power and was mounted on a test stand equipped with scales for measuring the thrust and engine torque. The results indicate that at full open throttle at sea level, for the engine tested, a gain in thrust horsepower of 18 percent using separate stacks, and 9.5 percent using a collector ring and discharge nozzle, can be expected at an air speed of 550 miles per hour.
    Keywords: Aircraft Propulsion and Power
    Type: NACA-SR-139
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
    facet.materialart.
    Unknown
    Flight Tests of Exhaust Gas Jet Propulsion, Special Report (1940)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: Flight test s were conducted on the XP-41 airplane, equipped with a Pratt & Whitney R1830-19, 14-cylinder, air-cooled engine, to determine the increase in flight speed obtainable by the use of individual exhaust stacks directed rearwardly to obtain exhaust-gas thrust. Speed increases up to 18 miles per hour at 20,000 feet altitude were obtained using stacks having an exit area of 3.42 square inches for each cylinder. A slight increase in engine power and decrease in cylinder temperature at a given manifold pressure were obtained with the individual stacks as compared with a collector-ring installation. Exhaust-flame visibility was quite low, particularly in the rich range of fuel-air ratios.
    Keywords: Aircraft Propulsion and Power
    Type: NACA-SR-165
    Format: application/pdf
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
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