National Advisory Committee for Aeronautics (NACA) - 295 Matching Results

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Cloud-droplet ingestion in engine inlets with inlet velocity ratios of 1.0 and 0.7

Description: Report presenting the paths of cloud droplets into two engine inlets for a wide range of meteorological and flight conditions. The amount of water in droplet form ingested by the inlets and the amount and distribution of water impinging on the inlet walls is obtained from droplet-trajectory configurations. Results regarding an inlet with velocity ratio of 1.0 and a ratio of 0.7 are provided.
Date: January 1956
Creator: Brun, Rinaldo J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Compressive Crippling of Structural Sections

Description: "A method is presented for calculating crippling stresses of structural sections as a function of material properties and the proportions of the section. The presence of formed or anisotropic material is accounted for by the use of an effective stress-strain curve. The method of analysis applies to many sections for which a procedure for calculating crippling was not previously available" (p. 1).
Date: January 1956
Creator: Anderson, Melvin S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Correlation of Crippling Strength of Plate Structures With Material Properties

Description: "A correlation approach to the crippling-strength analysis of plate structures in new materials and at elevated temperatures is presented. Appropriately defined crippling-strength moduli and correlation procedures are given for predicting the effect of a change in material properties on the strength of a structure. The strength moduli are readily calculated from the effective compressive stress-strain curve for the structural material" (p. 1).
Date: January 1956
Creator: Anderson, Roger A. & Anderson, Melvin S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Design Criteria for Axisymmetric and Two-Dimensional Supersonic Inlets and Exits

Description: Report presenting design charts for single- and double-oblique-shock inlets and isentropic axisymmetric and two-dimensional surfaces with theoretically focused Mach lines for Mach numbers up to 4.0. The requirement of internally and externally attached shocks at the cowl lip is also considered.
Date: January 1956
Creator: Connors, James F. & Meyer, Rudolph C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Effect of climb technique on jet-transport noise

Description: From Summary: "A theoretical investigation of jet-transport climb technique was made to determine the effect of variations in engine thrust and airspeed on sound-pressure levels heard by a ground observer. Reducing either thrust or climb airspeed results in reduced sound-pressure levels. Reducing thrust decreases the sound power radiated; decreasing climb airspeed permits the initiation of climb sooner and hence results in increasing the source to observer distance."
Date: January 1956
Creator: North, Warren J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Experimental and calculated temperature and mass histories of vaporizing fuel drops

Description: Report presenting a comparison of experimental and calculated mass and temperature histories of drops vaporizing with a constant velocity relative to the air. The results indicate that the unsteady state or time required for the drop to reach the wet-bulb temperature is an appreciable portion of the total vaporization time. Results regarding the measurement of surface and center temperature of drops, internal circulation in drops, heat transfer from thermocouple to drop, experimental temperatur… more
Date: January 1956
Creator: El Wakil, M. M.; Priem, R. J.; Brikowski, H. J.; Myers, P. S. & Uyehara, O. A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Experimental investigation of air-flow uniformity and pressure level on wire cloth for transpiration-cooling applications

Description: Report presenting an investigation of the problem of producing uniform air flow through a calendered or cold-rolled sheet of brazed stainless-steel corduroy wire cloth on 20x250 mesh cloth in regions of low permeability. The effect of exit level was determined at several exit level pressures on three different types of mesh wire cloth. Results regarding airflow uniformity for calendered wire cloth, effect of exit pressure or pressure level on air flow, and permeability and strength of 20x200 me… more
Date: January 1956
Creator: Donoughe, Patrick L. & McKinnon, Roy A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Hydrodynamic Impact Loads in Smooth Water for a Prismatic Float Having an Angle of Dead Rise of 10 Degrees

Description: Note presenting a prismatic float with an angle of dead rise of 10 degrees, which was subjected to smooth-water impacts in the impact basin. The investigation consisted of a series of impacts at fixed angles of trim of 3 degrees, 12 degrees, 20 degrees, and 30 degrees and at flight-path angles from 2 to 23 degrees. Results regarding the effect of dead-rise function and aspect-ratio factor on hydrodynamic load and chine immersion are provided.
Date: January 1956
Creator: Edge, Philip M., Jr.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Influence of Temperature on Creep, Stress-Rupture and Static Properties of Melamine-Resin and Silicone-Resin Glass-Fabric Laminates

Description: Note presenting results of the following tests of melamine-resin glass-fabric laminates and silicone-resin glass-fabric laminates at temperatures up to 400 and 600 degrees Fahrenheit: static-tension, static-compression, tension-creep, and time-to-fracture tests. The mechanical properties of both laminates weakened with increase in temperature, as a rule.
Date: January 1956
Creator: Findley, William N.; Peithman, Harlan W. & Worley, Will J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Instrumentation for Measurements of Free-Space Sound Pressures in the Immediate Vicinity of a Propeller in Flight

Description: Note presenting a description of instrumentation suitable for making in-flight measurements of the free-space sound pressures in the immediate vicinity of a propeller in forward flight. A description of the system, which consists of a microphone, probe, telemeter, and analyzer is provided.
Date: January 1956
Creator: Mace, William D.; Haney, Francis J. & Brummer, Edmund A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Investigation of Far Noise Field of Jets 1: Effect of Nozzle Shape

Description: Note presenting an investigation of the effect of nozzle shape on the noise generation of air jets, which was conducted on convergent, convergent-divergent, and several plug-type nozzles. The nozzle areas were approximately equal to the area of a 3- or 4-inch-diameter circular nozzle. Results regarding total acoustic power, sound spectra, and directional effects are provided.
Date: January 1956
Creator: Callaghan, Edmund E. & Coles, Willard D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Investigation of Far Noise Field of Jets 2: Comparison of Air Jets and Jet Engines

Description: Report presenting a comparison of the noise generation of air jets and turbojet engines under similar free-flight conditions. Results regarding a comparison of the sound power, afterburner data, spectrum measurements, noise data for engine thrust, and frequency distribution for the two engines are provided.
Date: January 1956
Creator: Coles, Willard D. & Callaghan, Edmund E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Investigation of the compressive strength and creep lifetime of 2024-T3 aluminum-alloy plates at elevated temperatures

Description: Report presenting the results of elevated-temperature compressive strength and creep tests of 2024-T3 aluminum-alloy plates supported in V-grooves. Strength test and creep lifetime results are presented for the plates and a method that uses time-dependent stress-strain curves for predicting plate-creep failure stresses is investigated.
Date: January 1956
Creator: Mathauser, Eldon E. & Deveikis, William D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Investigation of the effect of short fixed diffusers on starting blowdown jets in the Mach number range from 2.7 to 4.5

Description: Report presenting an investigation at several Mach numbers to determine the effect of short fixed convergent-divergent wedge diffusers on the starting characteristics of blowdown jets exhausting to the atmosphere. Results regarding the boundary-layer separation on nozzle contour, results of the testing, and analysis of flow during the starting process are provided.
Date: January 1956
Creator: Moore, John A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Investigation of the propulsive characteristics of a helicopter-type pulse-jet engine over a range of Mach numbers and angle of yaw

Description: Report presenting a determination of the nonwhirling propulsive characteristics of a helicopter-type pulse-jet engine mounted on a simulated helicopter rotor blade in the 16-foot transonic tunnel. Propulsive characteristics as a function of fuel-flow rate at a variety of Mach numbers and angles of yaw. Results regarding engine propulsive characteristics, comparison of whirling and nonwhirling data, and effect of engine operation on airfoil surface pressures are provided.
Date: January 1956
Creator: Carpenter, Paul J.; Shivers, James P. & Lee, Edwin E., Jr.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Method and tables for determining the time response to a unit impulse from frequency-response data and for determining the fourier transform of a function of time

Description: From Summary: "A simple and rapid method is presented for the determination of the time response to a unit impulse from a frequency-response data and for evaluating the Fourier transform of a function of time. Both methods are applicable to linear functions for which Fourier transforms exist. Tables are presented which greatly reduce the time required to perform the computations. Procedures for performing the calculations by use of the tables are illustrated and outlined step by step."
Date: January 1956
Creator: Huss, Carl R. & Donegan, James J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

An Oil-Stream Photomicrographic Aeroscope for Obtaining Cloud Liquid-Water Content and Droplet Size Distributions in Flight

Description: "An airborne cloud aeroscope by which droplet size, size distribution, and liquid-water content of clouds can be determined has been developed and tested in flight and in wind tunnels with water sprays. In this aeroscope the cloud droplets are continuously captured in a stream of oil, which Is then photographed by a photomicrographic camera. The droplet size and size distribution can be determined directly from the photographs" (p. 1).
Date: January 1956
Creator: Hacker, Paul T.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

On the permeability of porous materials

Description: Report presenting an investigation of the effects of porous-material permeability characteristics of the absolute pressure level, choking of the flow, bending the material, and other factors. Samples of rolled 30-by-250-mesh Dutch weave Monel metal cloth and 1/16-inch-thick sintered bronze were calibrated with constant upstream and downstream pressures. Results regarding the effect of Mach and Reynolds number on permeability, effect of rolling the material, and effect of bending the material ar… more
Date: January 1956
Creator: Yates, E. Carson, Jr.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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On the Permeability of Porous Materials

Description: Note presenting an investigation of the effects on porous-material permeability characteristics of the absolute pressure level, choking of the flow, bending the material, and other factors. Experiments showed permeability characteristics to be appreciably affected by absolute pressure level, flow choking, and thickness of the material. Results regarding testing with wire cloth and sintered metal are provided.
Date: January 1956
Creator: Yates, E. Carson, Jr.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

A preliminary investigation of the effects of frequency and amplitude on the rolling derivatives of an unswept-wing model oscillating in roll

Description: Report presenting a model with separable wing and tail assembly oscillated in roll through a range of frequencies and amplitudes of oscillation for an angle of attack of 0 degrees and at one frequency and amplitude for two higher angles of attack in order to determine the effects of unsteady motion on the rolling stability derivatives of the model and its components. Results regarding yawing due to rolling, damping in roll, quality of data, and comparison of results obtained by different techni… more
Date: January 1956
Creator: Fisher, Lewis R.; Lichtenstein, Jacob H. & Williams, Katherine D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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A Second-Order Shock-Expansion Method Applicable to Bodies of Revolution Near Zero Lift

Description: Report presenting the development of a second-order shock-expansion method applicable to bodies of revolution. Results regarding nonlifting bodies, lifting bodies, and approximations of the present method are provided.
Date: January 1956
Creator: Syvertson, Clarence A. & Dennis, David H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Bodies of revolution having minimum drag at high supersonic airspeeds

Description: Report presenting calculations of approximate shapes of nonlifting bodies having minimum pressure foredrag at higher supersonic airspeeds. The investigation is carried out for various combinations of the conditions of given body length, base diameter, surface area, and volume.
Date: February 1956
Creator: Eggers, A. J., Jr.; Resnikoff, Meyer M. & Dennis, David H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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