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Properties of low-aspect-ratio pointed wings at speeds below and above the speed of sound

Description: "Low-aspect-ratio wings having pointed plan forms are treated on the assumption that the flow potentials in planes at right angles to the long axis of the airfoils are similar to the corresponding two-dimensional potentials. For the limiting case of small angles of attack and low aspect ratios the theory brings out the following significant properties: (1) The lift of a slender, pointed airfoil moving in the direction of its long axis depends on the increase in width of the sections in a downst… more
Date: May 11, 1945
Creator: Jones, Robert T.
Partner: UNT Libraries Government Documents Department
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A Photoelectric Hygrometer

Description: Note presenting an instrument that measures small absolute humidity changes by photoelectric examination of the 9440 angstrom units absorption band of water vapor. The instrument consists of a small source of light which sends its radiation over an air path of less than 1.5 meters to a dispersing system.
Date: May 1945
Creator: Hamermesh, Bernard; Reines, Frederick & Korff, Serge A.
Partner: UNT Libraries Government Documents Department
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Bearing strengths of 24S-T aluminum alloy plate

Description: Report presenting a series of tests to determine the bearing yield and ultimate strengths of samples of 1/4- and 2-inch-thick plate of aluminum alloy 24S-T and to establish nominal ratios of bearing-to-tensile properties for the commercial range of plate thicknesses. Results regarding individual bearing testing, ratios of average bearing to tensile properties, and ratios of bearing yield strength to tensile yield strength are provided.
Date: June 1945
Creator: Moore, R. L. & Wescoat, C.
Partner: UNT Libraries Government Documents Department
open access

Table of Interplanar Spacings for Crystal-Structure Determinations by X-Ray Diffraction With Molybdenum, Copper, Cobalt, Iron, and Chromium Radiations

Description: "For a simple diffraction pattern, the time required to calculate interplanar distances from measurements of the pattern is not excessive. If more than a few lines are present, however, or if several patterns are to be studied, it is very advantageous to have available a table giving interplanar spacings directly in terms of the linear measurements made on the film of the lines appearing on the diffraction pattern. The preparation of the table given here was undertaken when the expansion of res… more
Date: October 1945
Creator: Kittel, J. Howard
Partner: UNT Libraries Government Documents Department
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Stresses at Cut-Outs in Shear Resistant Webs as Determined by the Photoelastic Method

Description: "Stress concentration factors for shear stresses around cut-outs in the webs of beams having shear resistant webs were determined by the photoelastic method. Webs with circular, square, and rectangular cut-outs were tested. The effect of reinforcements around square and circular cut-outs was investigated" (p. 1).
Date: October 1945
Creator: Ruffner, Benjamin F. & Schmidt, Calvin L.
Partner: UNT Libraries Government Documents Department
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Measurements of Recovery Factors and Coefficients of Heat Transfer in a Tube for Subsonic Flow of Air

Description: Note presenting measurements of heat flow to air at subsonic velocities and substantially constant Reynolds number, which show that the heat-transfer coefficient is independent of the difference between the temperature of the heated wall and the adiabatic wall temperature. Recovery factors are measured at the pipe wall for adiabatic flow.
Date: June 1945
Creator: McAdams, William H.; Nicolai, Lloyd A. & Keenan, Joseph H.
Partner: UNT Libraries Government Documents Department
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The Strength of Semielliptical Cylinders Subjected to Combined Loadings

Description: "The present report covers tests made on elliptical cylinders with a center support which were subjected to various simple and combined loadings. The tests yielded a series of interaction curves for combined loadings on such cylinders which should be useful in wing nose section analysis" (p. 1).
Date: February 1945
Creator: Sechler, E. E. & Frederick, J. L.
Partner: UNT Libraries Government Documents Department
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Tests on Thin-Walled Celluloid Cylinders to Determine the Interaction Curves Under Combined Bending, Torsion, and Compression or Tension Loads

Description: Note presenting a two part report on cylinder; one is on the modulus of electricity of celluloid sheet and the effect of temperature change on the value of the modulus of elasticity, while the other gives the results of tests on a considerable number of thin-walled, circular celluloid cylinders of several lengths, diameters, and wall thicknesses.
Date: January 1945
Creator: Bruhn, Elmer F.
Partner: UNT Libraries Government Documents Department
open access

Friction in Pipes at Supersonic and Subsonic Velocities

Description: Note presenting an experimental determination of the apparent friction coefficient for the flow of air through smooth pipes at subsonic and supersonic velocities. In supersonic flow, the results were found to be strongly influenced by the presence of oblique shocks formed at the junction of nozzle and pipe. Results regarding the apparent friction coefficient, subsonic flow, supersonic flow, and comparisons with other investigations are provided.
Date: January 1945
Creator: Keenan, Joseph H. & Neumann, Ernest P.
Partner: UNT Libraries Government Documents Department
open access

Bonding Strengths of Adhesives at Normal and Low Temperatures

Description: Note presenting a determination of the bonding strengths of two thermosetting adhesives, liquid Cycleweld C-3 and Ardux 1, to several aircraft materials using shear tests made on lap-joint specimens. The specimens were tested at 25 degrees Celsius and at subfreezing temperatures of approximately -40 degrees Celsius. Results regarding the specimens bonded under clamping pressure, specimens bonded after various surface treatments, specimens of metal bonded to plywood, and specimens of aluminum bo… more
Date: January 1945
Creator: Axilrod, B. M. & Jirauch, D. H.
Partner: UNT Libraries Government Documents Department
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Studies of Blade Shank and Pitch Distribution for Constant-Speed Propellers

Description: Note presenting an experimental investigation of the influences of blade shank form and pitch distribution on the aerodynamic characteristics of constant-speed propellers. The results indicated that the replacement of round blade shanks by faired ones produced substantial improvements of efficiency which increased with the advance ratio. Results regarding blade shank form, pitch distribution, and influences of blade loading and number of blades are provided.
Date: January 1945
Creator: Reid, Elliott G.
Partner: UNT Libraries Government Documents Department
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The inward bulge type buckling of monocoque cylinders 3: revised theory which considers the shear strain energy

Description: Report presenting the third part of an investigation dealing with the inward bulge type buckling of monocoque cylinders the theory of buckling in pure bending, which is refined through the consideration of the shear strain energy stored in the sheet covering, the assumption of a revised deflected shape of the rings, and the use of summations in place of some of the integrations of the preceding report.
Date: April 1945
Creator: Hoff, N. J. & Klein, Bertram
Partner: UNT Libraries Government Documents Department
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On a Method of Constructing Two-Dimensional Subsonic Compressible Flows Around Closed Profiles

Description: Note showing that under certain conditions, a two-dimensional subsonic compressible flow around an airfoil profile can be derived from an incompressible flow around another profile. The connection between the two "conjugate flows" is given by a simple conformal transformation of the respective hodograph planes.
Date: March 1945
Creator: Bers, Lipman
Partner: UNT Libraries Government Documents Department
open access

On Two-Dimensional Flows of Compressible Fluids

Description: "This report is devoted to the study of two-dimensional steady motion of a compressible fluid. It is shown that the complete flow pattern around a closed obstacle cannot be obtained by the method of Chaplygin. In order to overcome this difficulty, a formula for the stream-function of a two-dimensional subsonic flow is derived" (p. 1).
Date: August 1945
Creator: Bergman, Stefan
Partner: UNT Libraries Government Documents Department
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Shear Elastic Properties of Some High Strength Nonferrous Metals as Affected by Plastic Deformation and by Heat Treatment

Description: Note presenting a study of the shear elastic properties of monel, nickel, Inconel, and aluminum-model tubing, as influenced by extension of annealed specimens, by cold reduction during manufacture, and by stress-relief annealing of cold-reduced materials. With slight extension of annealed tubing, the shear proof stresses generally decrease, owing to induced internal stress.
Date: January 1945
Creator: Mebs, R. W. & McAdam, D. J., Jr.
Partner: UNT Libraries Government Documents Department
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On the Circulatory Subsonic Flow of a Compressible Fluid Past a Circular Cylinder

Description: "The circulatory subsonic flow around an infinite circular cylinder is computed using the linearized pressure-volume relation, by a method developed in a previous report. Formulas and graphs are given for the velocity and pressure distributions, the circulation, the lift, and the dependence of the critical Mach number upon the position of the stagnation point" (p. 1).
Date: July 1945
Creator: Bers, Lipman
Partner: UNT Libraries Government Documents Department
open access

The Elastic Constants for Wrought Aluminum Alloys

Description: "There are several constants which have been devised as numerical representations of the behavior of metals under the action of loadings which stress the metal within the range of elastic action. Some of these constants, such as Young's modulus of elasticity in tension and compression, shearing modulus of elasticity, and Poisson's ratio, are regularly used in engineering calculations. Precise tests and experience indicate that these elastic constants are practically unaffected by many of the fa… more
Date: January 1945
Creator: Templin, R. L. & Hartmann, E. C.
Partner: UNT Libraries Government Documents Department
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Graphical and Analytical Methods for the Determination of a Flow of a Compressible Fluid Around an Obstacle

Description: "Chaplygin introduced the hodograph method in the theory of compressible fluid flows and developed a method for constructing stream functions of such flows. This method, which has been extensively used in investigation of compressible fluid flows, is limited in certain respects. The expression for the stream function obtained in this manner can represent only certain types of flow patterns. In general, flow patterns obtained in this way cannot represent the whole flow around an obstacle, but on… more
Date: July 1945
Creator: Bergman, Stefan
Partner: UNT Libraries Government Documents Department
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Strength of Wing Beams Under Axial and Transverse Loads

Description: Note presenting wing beams tested under axial compressive loads, transverse loads, and combined axial and transverse loads. Deflections and strains in the elastic range were in general agreement with those computed from the simple beam theory after taking account of the secondary bending moment produced by the axial load as the beam deflected under load.
Date: September 1945
Creator: Ramberg, Walter; McPherson, A. E. & Levy, Samuel
Partner: UNT Libraries Government Documents Department
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Survey of Adhesives and Adhesion

Description: Report presenting an investigation regarding the strengths of bonds between different chemical types of adhesives and adherends. Some of the topics explored include the theoretical aspects of adhesion and properties of adhesively bonded structures.
Date: August 1945
Creator: Rinker, R. C. & Kline, G. M.
Partner: UNT Libraries Government Documents Department
open access

Net Heat of Combustion of AN-F-28 Aviation Gasolines

Description: "Experimental data on the heats of combustion and hydrogen contents of a number of aviation gasolines have been used in deriving a formula for computing net heat of combustion from (measured) gross heat of combustion. This formula appears to be sufficiently reliable for the purpose and has the advantage of making hydrogen determinations unnecessary. The data on heats of combustion are presented in tabular form, and in graphs showing the relation between net heat of combustion and (1) hydrogen c… more
Date: June 1945
Creator: Jessup, R. S. & Cragoe, C. S.
Partner: UNT Libraries Government Documents Department
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