UNT Libraries Government Documents Department - 65 Matching Results

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Determination of Rate, Area, and Distribution of Impingement of Waterdrops on Various Airfoils From Trajectories Obtained on the Differential Analyzer

Description: "The trajectories of waterdrops in air flowing over airfoils are determined for three airfoil - angle-of-attack combinations using the differential analyzer to solve the differential equations of motion of the waterdrops. From these trajectories the rate of water impingement, the area of impingement, and the distribution of impingement are determined as functions of two dimensionless moduli. Comparisons are made of the rate of water impingement on these airfoils and the rate of water impingemen… more
Date: February 16, 1949
Creator: Guibert, A. G.; Janssen, E. & Robbins, W. M.
Item Type: Refine your search to only Report
open access

Investigation of Icing Characteristics of Typical Light Airplane Engine Induction Systems

Description: "The icing characteristics of two typical light-airplane engine induction systems were investigated using the carburetors and manifolds of engines in the horsepower ranges from 65 to 85 and 165 to 185. The smaller system consisted of a float-type carburetor with an unheated manifold and the larger system consisted of a single-barrel pressure-type carburetor with an oil-jacketed manifold. Carburetor-air temperature and humidity limits of visible and serious Icing were determined for various engi… more
Date: February 1949
Creator: Coles, Willard D.
Item Type: Refine your search to only Report
open access

Determination of rate, area, and distribution of impingement of of waterdrops on various airfoils from trajectories obtained on the differential analyzer

Description: From Summary: "The trajectories of waterdrops in air flowing over airfoils are determined for three airfoil-angle-of-attack combinations using the differential analyzer to solve the differential equations of motion of the waterdrops. From these trajectories the rate of water impingement, the area of impingement, and the distribution of impingement are determined as functions of two dimensionless moduli. Comparisons are made of the rate of water impingement on these airfoils and the rate of wate… more
Date: February 16, 1949
Creator: Guibert, A. G.; Janssen, E. & Robbins, W. M.
Item Type: Refine your search to only Report
open access

The Buckling of Parallel Simply Supported Tension and Compression Members Connected by Elastic Deflectional Springs

Description: Note presenting an investigation of the problem of the buckling of parallel simply supported tension and compression members connected by equally stiff and equally spaced elastic deflection springs as an approximation to the problem of the effect of finite stiffness of ribs and tension surface on the buckling load of the compression surface of a wing. Charts relating compressive buckling load, deflectional spring stiffness, and the ratio of the flexural stiffness of the members are given for te… more
Date: February 1949
Creator: Seide, Paul & Eppler, John F.
Item Type: Refine your search to only Report
open access

Effects of Partial Admission on Performance of a Gas Turbine

Description: Report presenting an investigation of the effect of partial admission of the driving fluid on the performance of a representative full-admission, production-type gas turbine. Results regarding losses, full-admission performance, partial-admission performance, partial admission as a means of power control, and a comparison of partial admission with other methods of power control are provided.
Date: February 1949
Creator: Kohl, Robert C.; Herzig, Howard Z. & Whitney, Warren J.
Item Type: Refine your search to only Report
open access

Method for Evaluating From Shadow or Schlieren Photographs the Pressure Drag in Two-Dimensional or Axially Symmetrical Flow Phenomena With Detached Shock

Description: "A method has been developed for evaluating from shadow or schileren photographs the pressure drag of axially symmetrical bodies at zero angle of attack or of two-dimensional bodies producing detached shock. The method consists in the determination of the flow properties along a characteristic line and the application of the momentum theorem to a stream tube around the body. The method can be applied to the determination of external drag of supersonic inlets with subsonic flow at the entrance o… more
Date: February 1949
Creator: Ferri, Antonio
Item Type: Refine your search to only Report
open access

The application of airfoil studies to helicopter rotor design

Description: From Summary: "In order to facilitate the application of miscellaneous airfoil data to the problems of the helicopter designer, a discussion of a number of the problems most frequently arising is presented. A reference list of published papers on airfoil section characteristics (or their application) which experience has shown to be useful in connection with these helicopter problems is included."
Date: February 1949
Creator: Gustafson, F. B.
Item Type: Refine your search to only Report
open access

A study of flow changes associated with airfoil section drag rise at supercritical speeds

Description: Report presenting a study of experimental pressure distributions and section characteristics for several moderately thick airfoil sections were made. The pressure distributions and section force characteristics of several moderately thick airfoil sections at Mach numbers above the drag-divergence Mach numbers were analyzed.
Date: February 1949
Creator: Nitzberg, Gerald E. & Crandall, Stewart
Item Type: Refine your search to only Report
open access

Effects of Several Design Variables on Turbine-Wheel Weight

Description: Report presenting an analysis showing the effect of several design variables on turbine-wheel flight. Equations are developed for the calculations of weights of the disk, the rim, and the blades, and use the following variables: the blading aspect ratio and solidity, the ratio of the centrifugal stress at the blade roots to that in the disk, and the ratio of wheel diameter at the blade root to wheel diameter at the blade tip.
Date: February 1949
Creator: LaValle, Vincent L. & Huppert, Merle C.
Item Type: Refine your search to only Report
open access

On Compressibility Corrections for Subsonic Flow Over Bodies of Revolution

Description: "A study of the subsonic flow past an infinitely long corrugated circular cylinder is presented to show the relation between two-dimensional and axisymmetrical flow. In fact, a solution is obtained which contains as limiting cases both the Prandtl-Glauert correction for two-dimensional flow and the Göthert correction for flow past slender bodies of revolution. Included in the paper are velocity-correction formulas for a cylinder with a single bump and for a corrugated cylinder in the presence o… more
Date: February 1949
Creator: Reissner, Eric
Item Type: Refine your search to only Report
open access

Triangular wings cambered and twisted to support specified distributions of lift at supersonic speeds

Description: Report presenting an application of the linearized supersonic flow theory to the calculation of the camber and twist required for various lift distributions on a triangular wing with leading edges behind the Mach cone. Several specific examples are used and plots of the cambered surfaces, corresponding lift distributions, and values of the theoretical drag coefficients are presented.
Date: February 1949
Creator: Baldwin, Barrett S., Jr.
Item Type: Refine your search to only Report
open access

The Response of Pressure Measuring Systems to Oscillating Pressures

Description: Note presenting a method for calculating the response and lag in pressure measuring systems subjected to steady-state sinusoidally varying pressures. The pressure system is assumed to consist of an inlet restriction, tubing length, and connected instrument volume. Results of the phase-shift determination are provided.
Date: February 1949
Creator: Taback, Israel
Item Type: Refine your search to only Report
open access

Determination of plate compressive strengths at elevated temperatures

Description: From Summary: "The results of local-instability tests of H-section plate assemblies and compressive stress-strain tests of extruded 75S-T6 aluminum alloy, obtained to determine flat-plate compressive strengths under stabilized elevated-temperature conditions, are given for temperatures up to 600 degrees Fahrenheit. The results show that methods available for calculating the critical compressive stress at room temperature can also be used at elevated temperatures if the applicable compressive st… more
Date: February 1949
Creator: Heimerl, George J. & Roberts, William M.
Item Type: Refine your search to only Report
open access

Elastic and plastic buckling of simply supported metalite type sandwich plates in compression

Description: Report presenting a solution for the problem of the compressive buckling of simply supported, flat, rectangular, Metalite type sandwich plates stressed either in the elastic or plastic range. Charts for the analysis of long sandwich plates are provided for plates with face materials of 24S-T3 aluminum alloy, 75S-T6 Alclad aluminum alloy, and stainless steel.
Date: February 1949
Creator: Seide, Paul & Stowell, Elbridge Z.
Item Type: Refine your search to only Report
open access

The Longitudinal Stability of Elastic Swept Wings at Supersonic Speed

Description: Report presenting calculations of the longitudinal stability characteristics of elastic swept wings of high aspect ratio experiencing bending and torsional deformations by applying the linearized lifting-surface theory. Results of numerical calculations for a wing of aspect ratio 3.2 and 60 degrees of sweepback at Mach number 1.414 are provided. A discussion of the supersonic lifting-surface theory, comparison of aeroelastic effects at supersonic speed with incompressible flow solutions, and st… more
Date: February 1949
Creator: Frick, C. W. & Chubb, R. S.
Item Type: Refine your search to only Report
open access

The Method of Characteristics for the Determination of Supersonic Flow Over Bodies of Revolution at Small Angles of Attack

Description: Note presenting the use of the method of characteristics for the determination of the supersonic-flow properties around bodies of revolution at a small angle of attack. The system developed considers the effect of the variation of entropy due to the curved shock and determines a flow that exactly satisfies the boundary conditions in the limits of the simplifications assumed.
Date: February 1949
Creator: Ferri, Antonio
Item Type: Refine your search to only Report
open access

Laminar mixing of a compressible fluid

Description: From Summary: "A theoretical investigation of the velocity profiles for laminar mixing of a high-velocity stream with a region of fluid at rest has been made assuming that the Prandtl number is unity. A method which involves only quadratures is presented for calculating the velocity profile in the mixing layer for an arbitrary value of the free-stream Mach number. Detailed velocity profiles have been calculated for free-stream Mach numbers of 0, 1, 2, 3, and 5."
Date: February 1949
Creator: Chapman, Dean R.
Item Type: Refine your search to only Report
open access

Office of Naval Research and NACA Metallurgical Investigation of a Large Forged Disc of S-816 Alloy

Description: "This report is one of a series in a cooperative research investigation undertaken to ascertain the properties of the better wrought heat-resisting alloys in the form of large discs required for gas-turbine rotors. The properties of large discs of S-816 alloy have been determined for both the as-forged and aged condition (disc NR-76B-F) and the heat-treated and aged condition (disc NR-76B-Q) at room temperature and, by means of stress-rupture and creep tests for time periods up to about 2000 ho… more
Date: February 1949
Creator: Cross, Howard C. & Freeman, J. W.
Item Type: Refine your search to only Report
open access

NACA and Office of Naval Research Metallurgical Investigation of Two Large Forged Discs of S-590 Alloy

Description: Note presenting the properties of large forged discs of S-590 alloy at room temperature, 1200, 1350, and 1500 degrees Fahrenheit in order to determine the level of properties obtainable in forgings of the type required for the rotor discs of gas turbines. The high physical properties of the forged and aged disc at temperatures up to 130 degrees Fahrenheit were its outstanding characteristics. Results regarding the hardness survey, short-time tensile properties, Charpy impact resistance, rupture… more
Date: February 1949
Creator: Freeman, J. W. & Cross, Howard C.
Item Type: Refine your search to only Report
open access

Observations on the Maximum Average Stress of Flat Plates Buckled in Edge Compression

Description: Note presenting compressive-strength data on flat plates for a number of aircraft structural materials subjected to graphical study. Results indicated that the maximum average stress, in the region where it differs appreciably from the critical stress, could be expressed as a constant times the one-fourth power of the critical stress times the three-fourths power of the compressive yield stresses.
Date: February 1949
Creator: Schuette, E. H.
Item Type: Refine your search to only Report
open access

Overbalancing in residual-liquidation computations

Description: Report presenting some methods for the systematic design of group displacements which expedite the liquidation of residuals in certain classes of problem, and the application of these methods is illustrated by numerical examples. Tables of functions are available to use with this method, which leads to much faster and easier computation.
Date: February 1949
Creator: Niles, Alfred S.
Item Type: Refine your search to only Report
open access

Determination of rate, area, and distribution of impingement of water drops on various airfoils from trajectories obtained on the differential analyzer

Description: From Summary: "The trajectories of waterdrops in air flowing over airfoils are determined for three airfoil-angle-of-attack combinations using the differential analyzer to solve the differential equations of motion of the waterdrops. From these trajectories the rate of water impingement, the area of impingement, and the distribution of impingement are determined as functions of two dimensionless moduli. Comparisons are made of the rate of water impingement on these airfoils and the rate of wate… more
Date: February 16, 1949
Creator: Guibert, A. G.; Janssen, E. & Robbins, W. M.
Item Type: Refine your search to only Report
open access

Flight Investigation of Flutter Models With 1/10-Scale Douglas D-558-2 Wing Panels

Description: Report presenting testing of three rocket-powered models with Douglas D-558-2 wings as horizontal fins with scaled structural parameters to determine whether the possibility of wing flutter due to torsion and bending exists in full-scale airplanes at transonic speeds. No wing flutter was present in the models tested, but pitching oscillation developed as it passed into the transonic range.
Date: February 16, 1949
Creator: Teitelbaum, Jerome M.
Item Type: Refine your search to only Report
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