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Aerodynamic characteristics of 15 NACA airfoil sections at seven Reynolds numbers from 0.7 x 10(exp 6) to 9.0 x 10(exp 6)

Description: Report presenting an investigation of the two-dimensional aerodynamic characteristics of 15 NACA airfoils at four Reynolds numbers. The results indicate that the drag coefficient at the design lift coefficient and the maximum lift coefficient are the most important aerodynamic characteristics and are most affected by Reynolds number changes.
Date: October 1949
Creator: Loftin, Laurence K., Jr. & Smith, Hamilton A.
Partner: UNT Libraries Government Documents Department
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A Class of de Laval Nozzles

Description: "A study is made herein of the irrotational adiabatic motion of a gas in the transition from subsonic to supersonic velocities. A shape of the de Laval nozzle is given, which transforms a homogeneous plane-parallel flow at large subsonic velocity into a supersonic flow without any shockwaves beyond the transition line from the subsonic to the supersonic regions of flow. The method of solution is based on integration near the transition line of the gas equations of motion in the form investigate… more
Date: October 1949
Creator: Falkovich, S. V.
Partner: UNT Libraries Government Documents Department
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Critical Shear Stress of a Curved Rectangular Panel With a Central Stiffener

Description: "A theoretical solution is given for the critical shear stress of a simply supported curved rectangular plate stiffened by a central stiffener offering no torsional restraint which lies in either the axial or circumferential direction. Results are obtained by means of the Galerkin method and are presented in the form of computed curves and tables" (p. 1).
Date: October 1949
Creator: Stein, Manuel & Yaeger, David J.
Partner: UNT Libraries Government Documents Department
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Elastic Buckling of Outstanding Flanges Clamped at One Edge and Reinforced by Bulbs at Other Edge

Description: Note presenting the compressive buckling stress of outstanding flanges reinforced by bulbs, which was computed by the strain-energy method for flanges with 10 shapes and a range of lengths. The results were checked for some cases by computations based on a differential-equation method. The results were analyzed to determine which shape of flange gave the greatest support to the structure to which it was attached.
Date: October 1949
Creator: Goodman, Stanley
Partner: UNT Libraries Government Documents Department
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Investigations Relating to the Extension of Laminar Flow by Means of Boundary-Layer Suction Through Slots

Description: Note presenting experimental investigations of boundary-layer suction through slots as a means of increasing the extent of laminar flow on airfoil sections. The results show that, with the use of suitable slots, substantial increases in the extent of laminar flow can be achieved by boundary-layer control with only a small expenditure of power. Results regarding slot geometry and arrangement, suction slots in an unfavorable pressure gradient, suction slots in a favorable pressure gradient, and d… more
Date: October 1949
Creator: Loftin, Laurence K., Jr. & Burrows, Dale L.
Partner: UNT Libraries Government Documents Department
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Investigations relating to the extension of laminar flow by means of boundary-layer suction through slots

Description: Report presenting an experimental investigation of boundary-layer suction through slots as a means of increasing the extent of laminar flow on airfoil sections. Results regarding slot geometry and arrangement, suction slots in an unfavorable pressure gradients, suction slots in a favorable pressure gradient, and a determination of the relations controlling the distribution of suction slots are provided.
Date: October 1949
Creator: Loftin, Laurence K., Jr. & Burrows, Dale L.
Partner: UNT Libraries Government Documents Department
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Lift Force of an Arrow-Shaped Wing

Description: "The flow about a conical body of an ideal compressible fluid is considered. Assume that the velocity of the oncoming flow at infinity W is directed along the z-axis. The system of Cartesian coordinates x, y, z with origin at the vertex of the cone O is shown" (p. 1).
Date: October 1949
Creator: Gurevich, M. I.
Partner: UNT Libraries Government Documents Department
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Machining & installation of graphite for 105 DR & H

Description: This report describes the basic design, intermediate and final stacking procedures, and graphite behavior of nuclear reactors DR and H during construction. Included in the report are test records to substantiate basic design assumptions and data and the actual performance of the graphite during preliminary and final stacking.
Date: October 1, 1949
Creator: MoKenna, W. R.
Partner: UNT Libraries Government Documents Department
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Method of designing cascade blades with prescribed velocity distributions in compressible potential flows

Description: By use of the assumption that the pressure-volume relation is linear, a solution to the problem of designing a cascade for a given turning and with a prescribed velocity distribution along the blade in a potential flow of a compressible perfect fluid was obtained by a method of correspondence between potential flows of compressible and incompressible fluids. The designing of an isolated airfoil with a prescribed velocity distribution along the airfoil is considered as a special case of cascade.… more
Date: October 1, 1949
Creator: Costello, George R.
Partner: UNT Libraries Government Documents Department
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Plastic buckling of extruded composite sections in compression

Description: From Summary: "The theory of plastic buckling, originally derived for individual plates, has been extended to apply to combinations of plates such as H- and Z-sections. The theory has been applied specifically to extruded H-sections of 75S-T6 aluminum alloy; the calculated buckling stresses agree satisfactorily with the stresses obtained experimentally."
Date: October 1949
Creator: Stowell, Elbridge Z. & Pride, Richard A.
Partner: UNT Libraries Government Documents Department
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PUREX PROCESS FOR PLUTONIUM AND URANIUM RECOVERY

Description: Labcratory data which indicate that the recovery of Pu and U and decontamination from fission products are feasible in a solvent extraction process using tributyl phosphate are given. The procedure consists of extracting Pu(IV) and U with 15% TBP--85% Varsol using 5.0 N HNO/sub 3/ as a salting agent. (J.R.D.)
Date: October 1, 1949
Creator: Lanham, W. B. & Runion, T. C.
Partner: UNT Libraries Government Documents Department
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Stresses in and general instability of monocoque cylinders with cutouts 8: calculation of the buckling load of cylinders with long symmetric cutout subjected to pure bending

Description: Report presenting a strain-energy theory established for the calculation of the buckling load in pure bending of reinforced monocoque cylinders which have a symmetric cutout on the compression side and buckle according to general-instability patterns. The difference between this theory and other theories is the use of the axial wave length as an additional parameter whose value was determined from a minimum condition.
Date: October 1949
Creator: Hoff, N. J.; Boley, Bruno A. & Mandel, Merven W.
Partner: UNT Libraries Government Documents Department
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Summary of the theoretical lift, damping-in-roll, and center-of-pressure characteristics of various wing plan forms at supersonic speeds

Description: Report presenting information for the determination of the theoretical lift, damping-in-roll, and center-of-pressure characteristics for a group of plan forms at supersonic speeds. The information is presented in three forms: equations, figures presenting generalized curves, and figures presenting curves for representative groups of configurations. Several observations are made in regards to the effect of taper ratio, angle of sweep, and aspect ratio on the values of the derivatives.
Date: October 1949
Creator: Piland, Robert O.
Partner: UNT Libraries Government Documents Department
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Theoretical spanwise lift distributions of low-aspect-ratio wings at speeds below and above the speed of sound

Description: From Summary: "The spanwise lift distributions of wings of low aspect ratio but of arbitrary plan form and angle-of-attack distribution have been analyzed by two well-established concepts: the virtual-mass concept and the Weissinger method. Both concepts have been found to yield the same simple integral expression for the spanwise lift distribution in terms of the spanwise angle-of-attack distribution. Tables and figures of lit distributions of low-aspect-ratio wings have been presented."
Date: October 1949
Creator: Diederich, Franklin W. & Zlotnick, Martin
Partner: UNT Libraries Government Documents Department
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Two-Dimensional Motion of a Gas at Large Supersonic Velocities

Description: "A large number of papers have been devoted to the problem of integration of equations of two-dimensional steady nonvertical adiabatic motion of a gas. Most of these papers are based on the application of the hodograph method of S. A. Chaplygin in which the plane of the hodograph of the velocity is taken as the region of variation of the independent variables in the equations of motion; the equations become linear in this plane. The exact integration of these equations is, however, obtained in … more
Date: October 1949
Creator: Falkovich, S. V.
Partner: UNT Libraries Government Documents Department
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Two matrix methods for calculating forcing functions from known responses

Description: Report presenting an analysis of two matrix methods for calculating responses of linear systems for given forcing functions and indicial responses in order to find a method suitable for solving the inverse problem of calculating forcing functions from known responses. The results of both methods are compared with exact solutions for both the direct and the inverse problems.
Date: October 1949
Creator: Mazelsky, Bernard & Diederich, Franklin W.
Partner: UNT Libraries Government Documents Department
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Vibrational modes of several hollow turbine blades and of solid turbine blade of similar aerodynamic design

Description: Experimental study to determine the vibrational modes of several hollow turbine blades and a solid turbine blade of similar aerodynamic design. Results regarding the significance of nodal patterns, vibrational modes of six blade types, and the probability of excitation in some of the blades are provided.
Date: October 3, 1949
Creator: Kemp, R. H. & Shifman, J.
Partner: UNT Libraries Government Documents Department
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Shorter Contributions to Alaskan Trace Elements Studies: 1946: Part 1: Trace Elements Investigations in the Grant Creek Area, Yukon Region, Alaska

Description: Report discussing field search of the U.S. Geological Survey. From abstract: "Field search in August 1946 failed to locate a reported occurrence of float from pitchblende veins in the Grand Creek area north of the Yukon River about 30 miles west of Tanana in central Alaska."
Date: October 4, 1949
Creator: Killeen, P. L. & White, M. G.
Partner: UNT Libraries Government Documents Department
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Control Effectiveness and Hinge-Moment Characteristics of a Tip Control Surface on a Low-Aspect-Ratio Pointed Wing at a Mach Number of 1.9

Description: Report presenting a wind-tunnel investigation of a semispan pointed wing of aspect ratio 1.7 with 60 degree leading-edge sweepback and 30 degree trailing-edge sweepforward with a control surface. The purpose of the investigation was to determine the effectiveness of flap-type controls at transonic and supersonic speeds. Results regarding the wing characteristics and control-surface characteristics are provided.
Date: October 5, 1949
Creator: Conner, D. William & May, Ellery B., Jr.
Partner: UNT Libraries Government Documents Department
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The Preparation of Aluminium Nitrate from Hydrated Aluminum Oxides

Description: This report discusses methods of producing aluminum nitrate for the Redox process. Large amounts of aluminum nitrate are consumed during the Redox process, so this report explores preparation of this material through the dissolution of hydrated aluminum oxide in nitric acid.
Date: October 5, 1949
Creator: Harmon, M. K.
Partner: UNT Libraries Government Documents Department
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An Analysis of Airspeeds Attained by a Douglas DC-4 Airplane in Commercial Operations During the Early Months of 1947

Description: Report presenting airspeed and altitude data for nonscheduled cargo operations of a Douglas DC-4 airplane between Seattle, Washington and Alaska during February and March of 1947 to determine the probability of reaching or exceeding given values of airspeed and Mach number. The total probability of exceeding a placard never-exceed speed of 266 mph depends primarily on exceeding the speed in descent. The probability was found to be about once in 100 hours of descent or once in 1000 hours of gene… more
Date: October 6, 1949
Creator: Steiner, Roy
Partner: UNT Libraries Government Documents Department
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An Empirical Method for Estimating Trailing-Edge Loads at Transonic Speeds

Description: Memorandum presenting an analysis of selected experimental pressure-distribution data at transonic speeds for the purpose of deriving an empirical method which may be used for estimating the trailing-edge loads and bending moments at the design stage. The trailing-edge normal-force and bending-moment coefficients calculated by the derived method follow the general trend of the experimental data and appear to be a guide where specifically applicable chordwise pressure-distribution data at transo… more
Date: October 6, 1949
Creator: Skopinski, T. H.
Partner: UNT Libraries Government Documents Department
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