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Aerodynamic coefficients for an oscillating airfoil with hinged flap, with tables for a Mach number of 0.7

Description: From Introduction: "The fundamental integral equation for the pressure distribution on an oscillating thin airfoil moving at subsonic speed has been derived by Possio in reference 1. Collocation procedures have been used by Possio, Frazer, and Skan, and others to obtain lift and moment on an oscillating first plate. An important contribution has been made by Dietze (see reference 2 and 3), who has developed an iterative procedure for numerical solution of Possio's integral equation."
Date: October 1950
Creator: Turner, M. J. & Rabinowitz, S.
Partner: UNT Libraries Government Documents Department
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Analysis of shear strength of honeycomb cores for sandwich constructions

Description: From Introduction: "In the present report an analysis was undertaken to arrive at a mathematical formula by which the shear strengths of honeycomb core materials could be calculated. Experimental verification of the formula of the present paper was obtained by tests of honeycomb-type sheets of resin-impregated paper; two groups of specimens were tested, each of which represented a different resin-impregation treatment of the basic paper."
Date: October 1950
Creator: Werren, Fred & Norris, Charles Brazer
Partner: UNT Libraries Government Documents Department
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An approximate method of calculating pressures in the tip region of a rectangular wing of circular-arc section at supersonic speeds

Description: From Introduction: "The present paper introduces the approximate method by means of which it is possible to calculate the pressures in the tip region of a rectangular with a symmetrical circular-arc section to a higher degree of accuracy than is possible with the usual linear methods."
Date: October 1950
Creator: Czarnecki, K. R. & Mueller, James N.
Partner: UNT Libraries Government Documents Department
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Boundary-layer measurements in 3.84- by 10-inch supersonic channel

Description: Report presenting boundary-layer measurements in the transonic and supersonic regions of a channel with maximum cross-sectional dimensions 3.84 by 10 inches and designed by potential-flow methods for a uniform Mach number of 2.08. Results regarding the Mach number distribution along the channel, temperature recovery and Prandtl number, boundary layer development, skin-friction coefficient, and secondary flows are provided.
Date: October 1950
Creator: Brinich, Paul F.
Partner: UNT Libraries Government Documents Department
open access

A Catalog of Study Material of Radioactive Minerals

Description: From Introduction: "This catalog is a list of specimens of radioactive minerals for which the Geological Survey has been collecting optical, X-ray diffraction, and other data."
Date: October 1950
Creator: Stern, T. W.
Partner: UNT Libraries Government Documents Department
open access

Comparison of Diluents for Tributyl Phosphate

Description: This report summarizes a study of the composition and physical properties of a number of hydrocarbon diluents together with some generalizations regarding relations between these properties.
Date: October 1, 1950
Creator: Burger, L. L.
Partner: UNT Libraries Government Documents Department
open access

Effect of heat and power extraction on turbojet-engine performance 3: analytical determination of effects of shaft-power extraction

Description: Report presenting an analysis of the performance of an axial-flow-type turbojet engine operating with shaft-power extraction by matching experimentally determined component characteristics of a typical axial-flow engine. General working charts are provided to investigate engine performance with variable and rated tail-pipe-nozzle area operation at constant turbine-inlet temperature, engine speed, and thrust.
Date: October 1950
Creator: Koutz, Stanley L.; Hensley, Reece V. & Rom, Frank E.
Partner: UNT Libraries Government Documents Department
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Effect of Heat-Capacity Lag on a Variety of Turbine-Nozzle Flow Processes

Description: Note presenting the computation of the effect of heat-capacity lag in the adiabatic expansion of a gas through a turbine nozzle computed using a one-dimensional analysis of a representative flow process. A number of parameter variations in the flow process are considered to determine the factors that amplify this effect and to show the magnitude of the deviation from equilibrium conditions.
Date: October 1950
Creator: Spooner, Robert B.
Partner: UNT Libraries Government Documents Department
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Effect of Heat-Capacity Lag on the Flow Through Oblique Shock Waves

Description: Report presenting an analysis of the effects of variable heat capacity on the flow parameters for oblique shock waves at high supersonic speeds at sea level. Two sets of data are provided: one for conditions immediately behind the shock wave at active degrees of freedom and another for asymptotic conditions behind the shock wave where all degrees of freedom are in equilibrium.
Date: October 1950
Creator: Ivey, H. Reese & Cline, Charles W.
Partner: UNT Libraries Government Documents Department
open access

The Effect of Ice Formations on Propeller Performance

Description: "Measurements of propeller efficiency loss due to ice formation are supplemented by an analysis to establish the magnitude of efficiency losses to be anticipated during flight in icing conditions. The measurements were made during flight in natural icing conditions; whereas the analysis consisted of an investigation of changes in blade-section aerodynamic characteristics caused by ice formation and the resulting propeller efficiency changes. Agreement in the order of magnitude of efficiency los… more
Date: October 1950
Creator: Neel, Carr B., Jr. & Bright, Loren G.
Partner: UNT Libraries Government Documents Department
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Energy Uses and Supplies, 1939, 1947, 1965

Description: Report issued by the U.S. Bureau of Mines discussing specific energy uses during the years of 1939, 1947, and 1965. As stated in the subject, "this is a summary of preliminary results of an exploratory study if energy uses and supplies in the United States" (p. 2). This report includes tables, and illustrations.
Date: October 1950
Creator: Barnett, Harold J.
Partner: UNT Libraries Government Documents Department
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Estimate of Known Recoverable Reserves of Coking Coal in Cambria County, Pennsylvania

Description: Report issued by the U.S. Bureau of Mines on estimates of known deposits of coking coal in Cambria County, Pennsylvania. Studies on the properties of coal and coal blends from the area are presented. The report includes maps and tables.
Date: October 1950
Creator: Dowd, James J.; Turnbull, Louis A.; Toenges, Albert L.; Cooper, H. M.; Abernethy, R. F.; Reynolds, D. A. et al.
Partner: UNT Libraries Government Documents Department
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A flight investigation and analysis of the lateral-oscillation characteristics of an airplane

Description: Report presenting flight tests to determine the causes of undesirable dynamic lateral-stability characteristics of an airplane. Various rudder modifications were flight tested with the rudder free and fixed over an indicated airspeed range from approximately 200 to 450 miles per hour. Results regarding rudder-fixed characteristics and rudder-free characteristics are provided.
Date: October 1950
Creator: Stough, Carl J. & Kauffman, William M.
Partner: UNT Libraries Government Documents Department
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Free Oscillations of an Atmosphere in Which Temperature Increases Linearly With Height

Description: Note presenting the concept that when the temperature in the atmosphere increases linearly with height, the speed of propagation of long waves does not approach a limit with increasing wave length, as in the case of an atmosphere in which the temperature at great heights is assumed to be constant or decreasing, but increases linearly with the period.
Date: October 1950
Creator: Pekeris, C. L.
Partner: UNT Libraries Government Documents Department
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Gust-tunnel investigation of a wing model with semichord line swept back 60 degrees

Description: Report presenting an investigation in the gust tunnel of a 60 degree sweptback-wing model to determine the effect of a large angle of sweep on gust loads. A simplified method of analysis, which uses a slope of the lift curve derived by the cosine law and which uses strip theory to estimate the penetration effect, appears to be applicable to the prediction of gust loads on wings swept as much as 60 degrees.
Date: October 1950
Creator: Pierce, Harold B.
Partner: UNT Libraries Government Documents Department
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Hydrodynamic Properties of Planing Surfaces and Flying Boats

Description: "The study of the hydrodynamic properties of planing bottom of flying boats and seaplane floats is at the present time based exclusively on the curves of towing tests conducted in tanks. In order to provide a rational basis for the test procedure in tanks and practical design data, a theoretical study must be made of the flow at the step and relations derived that show not only qualitatively but quantitatively the inter-relations of the various factors involved. The general solution of the prob… more
Date: October 1950
Creator: Sokolov, N. A.
Partner: UNT Libraries Government Documents Department
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Impact-Pressure Interpretation in a Rarefied Gas at Supersonic Speeds

Description: Note presenting a summary of the interpretation of measured impact pressures in a rarefied gas. Experimental results are presented for source-shaped impact tubes for Mach numbers between 2.3 and 3.6 and Reynolds numbers from 25 to 804.
Date: October 1950
Creator: Kane, E. D. & Maslach, G. J.
Partner: UNT Libraries Government Documents Department
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Measurement of the moments of inertia of an airplane by a simplified method

Description: Report presenting a simplified method for the experimental determination of the moments of inertia, product of inertia, and inclination of the principal axes, the associated equipment and techniques, and the application of this method to a conventional airplane.
Date: October 1950
Creator: Turner, Howard L.
Partner: UNT Libraries Government Documents Department
open access

The NACA Oil-Damped V-G Recorder

Description: Note presenting the development of a NACA oil-damped V-G recorder in which viscous damping of accelerometer results in improved frequency response, reduces susceptibility to vibration, and eliminates the necessity for field adjustments of damping.
Date: October 1950
Creator: Taback, Israel
Partner: UNT Libraries Government Documents Department
open access

Pitchblende Deposits at the Wood and Calhoun Mines, Central City Mining District, Gilpin County, Colorado

Description: From introduction: The purpose of this work was to determine the distribution and reserves of pitchblende in the veins. These particular mines were selected because the other mines that had produced pitchblende in the east were either inaccessible, or accessible under such adverse conditions as to make detailed mapping impracticable.
Date: October 1950
Creator: Moore, Frank B. & Butler, C. R.
Partner: UNT Libraries Government Documents Department
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Potential by-Product Elements in the Phosphoria Formation of the Western States

Description: Report discussing elements that may be by-products of mining or processing phosphate rock. "Many of these elements are of interest because they are essential, if only in small quantities, to plant growth. Others are of concern because they must be removed from the phosphate rock before some of the chemical products manufactured from it can be utilized without deleterious effects."
Date: October 1950
Creator: McKelvey, V. E.
Partner: UNT Libraries Government Documents Department
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Preliminary Report on Some Uranium Deposits Along the West Side of the San Rafael Swell, Emery County, Utah

Description: From introduction: Twelve uranium-bearing deposits were examined along 30 miles of the western border of the San Rafael Swell in Emery County, Utah, from September 21 to 29, 1950. The area examined lies in Emery County, east-central Utah, along the west flank of the San Rafael anticline (Fig. 1).
Date: October 1950
Creator: Reyner, Millard L.
Partner: UNT Libraries Government Documents Department
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