National Advisory Committee for Aeronautics (NACA) - 10 Matching Results

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Basic Requirements of Fuel-Injection Nozzles for Quiescent Combustion Chambers

Description: This report presents test results obtained during an investigation of the performance of a single-cylinder, high-speed, compression-ignition test engine when using multiple-orifice fuel-injection valve nozzles in which the number and the direction of the orifices were varied independently.
Date: June 1931
Creator: Spanogle, J. A. & Foster, H. H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Effect of Stabilizing Forces on Turbulence

Description: The appearance of expressed discontinuity layers in the free atmosphere, where a warm air mass flows over a cold mass without perceptible intermingling forms the basis of the present report. In these experiments an air stream is to be blown between a water-cooled and a vapor-heated plate. According to what preceded it is anticipated that the exchange will be enhanced.
Date: June 1931
Creator: Prandtl, L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Endurance and Other Properties at Low Temperatures of Some Alloys for Aircraft Use

Description: "The low temperature endurance properties of materials for aircraft construction are not well known. In order to determine them, apparatus for testing endurance at -40 C has been devised. The endurance properties of monel metal, low-carbon stainless steel, "18 and *, " 3 1/2% Ni steel and chromium-molybdenum steel have been determined at -40 C and at room temperature about +20 C. Tensile, impact and hardness tests of these materials have also been made at various temperatures" (p. 1).
Date: June 1931
Creator: Russell, H. W. & Welcker, W. A., Jr.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Estimated Effect of Ring Cowl on the Climb and Ceiling of an Airplane

Description: From Summary: "Although the application of a ring cowl to an airplane with an air-cooled engine increases the maximum L/D and the high speed to an appreciable extent, the performance in climb and ceiling is not increased as much as one would expect without analyzing the conditions. When a ring cowl is installed on an airplane, the propeller is set at a higher pitch to allow the engine to turn its rated r.p.m. at the increased high speed. V/nD is increased and the propeller efficiency at high sp… more
Date: June 1931
Creator: Louden, F. A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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The Frictionless Flow in the Region Around Two Circles

Description: This investigation attempts to surpass the boundaries of pure mathematical interest in that it possesses as an example, a flow investigation in a multiply-connected region. Then the results appear to be carried out by means of an appropriate conformal representation of the region around two chosen closed curves. Thus we have the basis of an exact plane theory of the biplane.
Date: June 1931
Creator: Lagally, M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Ice Prevention on Aircraft by Means of Engine Exhaust Heat and a Technical Study of Heat Transmission From a Clark Y Airfoil

Description: "This investigation was conducted to study the practicability of employing heat as a means of preventing the formation of ice on airplane wings. The report relates essentially to technical problems regarding the extraction of heat from the exhaust gases and its proper distribution over the exposed surfaces. In this connection a separate study has been made to determine the variation of the coefficient of heat transmission along the chord of a Clark Y airfoil. Experiments on ice prevention both … more
Date: June 12, 1931
Creator: Theodorsen, Theodore & Clay, William C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Landing Impact of Seaplanes

Description: The theory of landing impact is briefly stated and the applicability of a previously suggested formula is extended. Theoretical considerations regarding impact measurements on models and actual seaplanes are followed by a brief description of the instruments used in actual flight tests. The report contains a description of the strength conditions and deals exhaustively with force measurements on the float gear of an "HE 9a" with flat-bottom and with V-bottom floats. The experimental data are gi… more
Date: June 1931
Creator: Pabst, Wilhelm
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

A Suggested Method for Measuring Turbulence

Description: The desirability of a quantitative measure of turbulence is emphasized, and a possible method of attack on the problem is discussed. Data are presented to show that the hot-wire anemometer has possibilities as an instrument for measuring turbulence. An apparatus consisting essentially of two hot wire, one parallel to the air flow and one at right angles to it, is suggested.
Date: June 1931
Creator: Taylor, C. Fayette
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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