National Advisory Committee for Aeronautics (NACA) - 819 Matching Results

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Achievement of Continuous Wall Curvature in Design of Two-Dimensional Symmetrical Supersonic Nozzles

Description: "Auxiliary boundary conditions are derived to assure continuity of wall curvature in applying the method of characteristics to the design of two-dimensional symmetrical supersonic nozzles. An illustrative example is included" (p. 1).
Date: January 1952
Creator: Evvard, J. C. & Marcus, Lawrence R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Airfoil profiles for minimum pressure drag at supersonic velocities -- general analysis with application to linearized supersonic flow

Description: From Summary: "A theoretical investigation is made of the airfoil profile for minimum pressure drag at zero lift in supersonic flow. In the first part of the report a general method is developed for calculating the profile having the least pressure drag for a given auxiliary condition, such as a given structural requirement or a given thickness ratio. To illustrate the general method, the optimum airfoil, defined as the airfoil having minimum pressure drag for a given auxiliary condition, is ca… more
Date: 1952
Creator: Chapman, Dean R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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An Approximate Method of Calculating the Deformations of Wings Having Swept, M or W, A, and Swept-Tip Plan Forms

Description: "An approximate method of calculating the deformations of wings of uniform thickness having swept, M or W, Delta, and swept-tip plan forms is presented. The method employs an adjustment to the elementary beam theory to account for the effect of the triangular root portion of a swept wing on the deformation of the outboard section of the wing. To demonstrate the general applicability of the method, the modified elementary theory is applied to the more complex M or W, Delta, and swept-tip plan fo… more
Date: 1952
Creator: Zender, George W. & Brooks, William A., Jr.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Axisymmetric Supersonic Flow in Rotating Impellers

Description: "General equations are developed for isentropic, frictionless, axisymmetric flow in rotating impellers with blade thickness taken into account and with blade forces eliminated in favor of the blade-surface function. It is shown that the total energy of the gas relative to the rotating coordinate system is dependent on the stream function only, and that if the flow upstream of the impeller is vortex-free, a velocity potential exists which is a function of only the radial and axial distances in t… more
Date: 1952
Creator: Goldstein, Arthur W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Behavior of vortex system behind cruciform wings - motions of fully rolled-up vortices

Description: An investigation and analysis of the motions of four fully rolled-up vortices representing the vortex system trailing behind cruciform wings by theoretical and visual-flow methods. Equations are developed for the three-dimensional paths traced by the vortices behind a cruciform wing banked 45 degrees, and calculations are made of the distance behind the wing at which the upper two vortices pass through the lower two.
Date: January 1952
Creator: Sacks, Alvin H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Buckling of rectangular sandwich plates subjected to edgewise compression with loaded edges simply supported and unloaded edges clamped

Description: Report presenting the compressive stress for buckling for a rectangular flat sandwich plate with loaded edges simply supported and unloaded edges rigidly clamped. The true values of the buckling stress are estimated as the arithmetic means of these bounds and are presented in a diagram which covers the entire practical range of the geometric and mechanical quantities involved.
Date: January 1952
Creator: Yen, Kuo Tai; Salerno, V. L. & Hoff, N. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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The Calculated and Measured Performance Characteristics of a Heated-Wire Liquid-Water-Content Meter for Measuring Icing Severity

Description: "Ground tests have been made of an instrument which, when assembled in a more compact form for flight installation, could be used to obtain statistical flight data on the liquid-water content of icing clouds and to provide an indication of icing severity. The sensing element of the instrument consists of an electrically heated wire which is mounted in the air stream. The degree of cooling of the wire resulting from evaporation of the impinging water droplets is a measure of the liquid-water con… more
Date: January 1952
Creator: Neel, Carr B. & Steinmetz, Charles P.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Calculation of aerodynamic forces on a propeller in pitch or yaw

Description: An analysis was made to determine the applicability of existing propeller theory and the theory of oscillating airfoils to the problem of determining the magnitude of the forces on propellers in pitch or yaw. Strip calculations using compressible airfoil characteristics were first made as though steady-state conditions existed successively at several blade positions of the propeller blades during one revolution. A theory of oscillating airfoils in pulsating incompressible potential flow was the… more
Date: January 1952
Creator: Crigler, John L. & Gilman, Jean, Jr.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Calculations on the forces and moments for an oscillating wing-aileron combination in two-dimensional potential flow at sonic speed

Description: Report presenting the use of linearized theory for compressible unsteady flow to obtain the velocity potential and lift and moment for a thin, harmonically oscillating, two-dimensional wing-aileron combination moving at sonic speed.
Date: January 1952
Creator: Nelson, Herbert C. & Berman, Julian H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Comparison of High-Speed Operating Characteristics of Size 215 Cylindrical-Roller Bearings as Determined in Turbojet Engine and in Laboratory Test Rig

Description: A comparison of the operating characteristics of 75-millimeter-bore (size 215) cylindrical-roller one-piece inner-race-riding cage-type bearings was made by means of a laboratory test rig and a turbojet engine. Cooling correlation parameters were determined by means of dimensional analysis, and the generalized results for both the inner- and the outer-race bearing operating temperatures are computed for the laboratory test rig and the turbojet engine. A method is given that enables the designer… more
Date: 1952
Creator: Macks, E. Fred & Nemeth, Zolton N.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Compressive buckling of simply supported curved plates and cylinders of sandwich construction

Description: From Summary: "Theoretical solutions are presented for the buckling in uniform axial compression of two types of simply supported curved sandwich plates: the corrugated-core type and the isotropic-core type. The solutions are obtained from a theory for orthotropic curved plates in which deflections due to shear are taken into account. Results are given in the form of equations and curves."
Date: January 1952
Creator: Stein, Manuel & Mayers, J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Concerning the Flow About Ring-Shaped Cowlings of Finite Thickness: Part 1

Description: "It is shown how one may obtain, in a simple manner, the forms of ring-shaped bodies from existing tables of functions according to the customary method of superposition of flow due to singularities and parallel flow. A number of examples of the forms and pressure distributions of annular source bodies with and without hub body are given, and the inlet conditions of such ring-shaped cowlings are investigated. Furthermore, the annular bodies of finite length are indicated that correspond to Jouk… more
Date: January 1952
Creator: Küchemann, Dietrich
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Design of two-dimensional channels with prescribed velocity distribution along the channel walls 1: relaxation solutions

Description: Report presenting a general method of design is developed for two-dimensional unbranched channels with prescribed velocities as a function of arc length along the channel walls. The method is developed for both incompressible and compressible, irrational, nonviscous flow. Five numerical examples are given including three elbow designs with the same prescribed velocity as a function of arc length along the channel walls but with incompressible, linearized compressible, and compressible flow.
Date: January 1952
Creator: Stanitz, John D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Detailed Computational Procedure for Design of Cascade Blades With Prescribed Velocity Distributions in Compressible Potential Flows

Description: "A detailed step-by-step computational outline is presented for the design of two-dimensional cascade blades having a prescribed velocity distribution on the blade in a potential flow of the usual compressible fluid. The outline is based on the assumption that the magnitude of the velocity in the flow of the usual compressible nonviscous fluid is proportional to the magnitude of the velocity in the flow of a compressible nonviscous fluid with linear pressure-volume relation" (p. 1).
Date: 1952
Creator: Costello, George R.; Cummings, Robert L. & Sinnette, John T., Jr.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Direct Measurements of Skin Friction

Description: Note presenting a device developed to measure local skin friction on a flat plate by measuring the force exerted upon a very small movable part of the surface of a flat plate. The device is applied to both low-speed and high-speed measurements. The paper describes the design and construction of the device and the results of the measurements.
Date: January 1952
Creator: Dhawan, Satish
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Ditching Investigation of a 1/12-Scale Model of the Douglas F3D-2 Airplane, TED No. NACA DE 381

Description: "An investigation of a 1/12- scale dynamically similar model of the Douglas F3D-2 airplane was made in calm water to observe the ditching behavior and to determine the safest procedure for making an emergency water landing. Various conditions of damage were simulated to determine the behavior which probably would occur in a full-scale ditching. The behavior of the model was determined from motion-picture records, time- history acceleration records, and visual observations" (p. 1).
Date: 1952
Creator: Fisher, Lloyd J. & Thompson, William C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Effects of compressibility on the performance of two full-scale helicopter rotors

Description: Report presents the results of an investigation conducted on the Langley helicopter test tower to determine experimentally the effects of compressibility on the performance and blade pitching moments of two full-scale helicopter rotors. Two sets of rotor blades were tested which differed only in that the blades of one set incorporated -8 degrees of linear twist, whereas the blades of the other set were untwisted. The tests covered a range of tip speeds from 350 to 770 feet per second and a rang… more
Date: 1952
Creator: Carpenter, Paul J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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The effects of Reynolds number on the application of NACA 16-series airfoil characteristics to propeller design

Description: Report presenting an analysis of airfoil data from several NACA 16-series propeller airfoils from tests of 5-inch chord models in the 24-inch high-speed tunnel and 12-inch-chord models in the 8-foot high-speed tunnel. Results indicated that differences of less than 1 percent in propeller efficiency at or near the design condition will be involved in applying data from 5-inch-chord and 12-inch-chord airfoil tests to full-scale propeller design.
Date: January 1952
Creator: Cleary, Harold E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Electrical Pressure Integrator

Description: Note presenting the design of an instrument utilizing Wheatstone bridge type of pressure sensing units that is capable of integration of airfoil pressures into a quantity representative of the normal force and pitching moment acting on the airfoil. Flight and wind-tunnel versions of the instrument are briefly described along with samples of test data obtained from them.
Date: January 1952
Creator: Helfer, Arleigh P.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Equal-Strength Design of Tension-Field Webs and Uprights

Description: Note presenting a method for proportioning thin-web beams to attain equal strength of web and uprights which may in turn be employed toward optimum design of these components. Improved empirical formulas for this purpose are developed the results checked by experimental loading of six beams.
Date: January 1952
Creator: Upson, Ralph H.; Phelps, George M. & Liu, Tung-Sheng
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Estimate of Slip Effect on Compressible Laminar-Boundary-Layer Skin Friction

Description: Note presenting a consideration of Rayleigh's problem for a compressible viscous gas, subject to slip at the wall. Expressions for slip velocity and skin friction are derived with the gas temperature at the wall and the product of viscosity times density assumed constant, or nearly so. The results of the solution are interpreted to define the border region between continuum and slip flow and to estimate the effect of slip.
Date: January 1952
Creator: Mirels, Harold
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Experimental Aerodynamic Derivatives of a Sinusoidally Oscillating Airfoil in Two-Dimensional Flow

Description: "Experimental measurements of the aerodynamic reactions on a symmetrical airfoil oscillating harmonically in a two-dimensional flow are presented and analyzed. Harmonic motions include pure pitch and pure translation, for several amplitudes and superimposed on an initial angle of attack, as well as combined pitch and translation. The apparatus and testing program are described briefly and the necessary theoretical background is presented" (p. 1).
Date: 1952
Creator: Halfman, Robert L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Experimental Determination of the Effect of Horizontal-Tail Size, Tail Length, and Vertical Location on Low-Speed Static Longitudinal Stability and Damping Pitch of a Model Having 45 Degree Sweptback Wing and Tail Surfaces

Description: Report presents the results of an investigation conducted in the Langley stability tunnel to determine the effects of horizontal tails of various sizes and at various tail lengths (when loaded on the fuselage center line) and also the effects of vertical location of the horizontal tail relative to the wing on the low-speed static longitudinal stability and on the steady-state rotary damping in pitch for a complete-model configuration. The wing and tail surfaces had the quarter-chord lines swept… more
Date: 1952
Creator: Lichtenstein, Jacob H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Experimental Determination of Time Constants and Nusselt Numbers for Bare-Wire Thermocouples in High-Velocity Air Streams and Analytic Approximation of Conduction and Radiation Errors

Description: Report presenting the results of experiments conducted to determine time constants of several bare-wire thermocouples mounted in cross flow to an air stream. Four pairs of common thermocouple materials with three different wire diameters were used. Results regarding the time constants, Nusselt numbers, effective gas temperature, and some numerical calculations are provided.
Date: January 1952
Creator: Scadron, Marvin D. & Warshawsky, Isidore
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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