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

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The Accuracy of the Substitute-Stringer Approach for Determining the Bending Frequencies of Multistringer Box Beams

Description: "The accuracy of the substitute-stringer approach for including the effects of shear lag in the calculation of the transverse modes and frequencies of multistringer box beams is investigated. Box beams, the covers of which consist of normal-stress-carrying stringers on sheets which carry not only shear but also normal stress, are analyzed exactly. Frequencies of beams with various numbers of stringers, obtained by means of this exact analysis, serve to determine the possible accuracy of the fre… more
Date: April 1956
Creator: Davenport, William W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Aerodynamic characteristics and flying qualities of a tailless triangular-wing airplane configuration as obtained from flights of rocket-propelled models at transonic and supersonic speeds

Description: Report discussing a flight investigation of rocket-powered models of a tailless triangular-wing airplane configuration was made through the transonic and low supersonic speed range at the Langley Pilotless Aircraft Research Station at Wallops Island, Va. An analysis of the aerodynamic coefficients, stability derivatives, and flying qualities based on the results obtained from the successful flight tests of three models is presented.
Date: November 1956
Creator: Mitcham, Grady L.; Stevens, Joseph E. & Norris, Harry P.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Aerodynamic investigation of a parabolic body of revolution at Mach number of 1.92 and some effects of an annular supersonic jet exhausting from the base

Description: Report discussing an aerodynamic investigation of a slender pointed parabolic body of revolution was conducted at Mach number of 1.92 with and without the effects of an annular supersonic jet exhausting from the base.
Date: September 1956
Creator: Love, Eugene S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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An air-flow-direction pickup suitable for telemetering use on pilotless aircraft

Description: From Summary: "A free-swiveling vane-type pickup for measuring air flow direction in both the angle-of-attack and angle-of-sideslip directions is described. Test results are presented which indicate that the pickup is aerodynamically stable and has an accuracy, obtained from a bench calibration, of better than 0.3^o under conditions including acceleration up to 20g in any direction, Mach numbers from 0.5 to 2.8, dynamic pressures up to at least 65 psi. Equations and curves which can be used to … more
Date: October 1956
Creator: Ikard, Wallace L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Analysis and comparison with theory of flow-field measurements near a lifting rotor in the Langley full-scale tunnel

Description: From Introduction: "The time-averaged flows are considerably simpler to deal with theoretically than are the instantaneous flows, and the results of several theoretical analyses are available (refs. 2 to 6, for example). Several previous experimental investigations (see ref. 7 for a bibliography) have provided some qualitative information on the subject by the use of smoke in flight and in wind tunnels. However, quantitative measurements (refs. 8 to 10) are extremely scarce and, in general, are… more
Date: April 1956
Creator: Heyson, Harry H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Analysis of a spin and recovery from time histories of attitudes and velocities as determined for a dynamic model of a contemporary fighter airplane in the free-spinning tunnel

Description: From Introduction: "In this paper are presented descriptions of the camera setups and associated equipment, the equations and methods used in determining the model attitudes and motions from the film, and time-history curves of the variables of the spin and recovery investigated. Discussions of the nature of the spin and recovery obtained and of factors ostensibly affecting these motions are included."
Date: April 1956
Creator: Scher, Stanley H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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An analysis of airspeed, altitude, and acceleration data obtained from a twin-engine transport airplane operated over a feeder-line route in the Rocky Mountains

Description: "Time-history data of airspeed, altitude, and acceleration obtained with the NACA VGH recorder from a twin-engine airplane operated by a regional feeder airline in the Rocky Mountains are evaluated to determine the magnitude and frequency of occurrence of gusts and gust accelerations and the operating airspeeds and altitudes. The results obtained are compared with the results previously obtained from a representative short-haul and long-haul operation" (p. 1).
Date: October 1956
Creator: Copp, Martin R. & Fetner, Mary W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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An analysis of buzzing in supersonic ram jets by a modified one-dimensional nonstationary wave theory

Description: From Introduction: "The buzz or pulsation of axially symmetric supersonic inlets having central bodies has been the subject of investigations since Oswatitsch first observed the phenomenon in 1944 (ref.1). This buzzing is essentially an oscillation of the normal shock along the spike of certain diffusers operating at mass flows below design, and this buzz decreases the performance of the propulsion units appreciably (ref.2). This paper continues the analysis of the buzzing cycle by means of a m… more
Date: July 1956
Creator: Trimpi, Robert L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Analysis of elastic thermal stresses in thin plate with spanwise and chordwise variations of temperature and thickness

Description: From Introduction: "The object of the present paper is to present an approximate method for calculating accurately the thermal stresses in a thin plate with both chordwise and spanwise variations in temperature and chordwise but restricted spanwise variations in thickness."
Date: November 1956
Creator: Mendelson, Alexander & Hirschberg, Marvin
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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An analysis of estimated and experimental transonic downwash characteristics as affected by plan form and thickness for wing and wing-fuselage configurations

Description: From Introduction: "The purpose of the present paper is to present summary of the information gleaned from various transonic-bump investigations of wing and wing-fuselage configurations at two representative tail heights and to compare these results with theoretical estimations made in subsonic and supersonic Mach number range."
Date: April 1956
Creator: Weil, Joseph; Campbell, George S. & Diederich, Margaret S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Analysis of laminar incompressible flow on semiporous channels

Description: From Introduction: "Experimental results for flow in a rectangular channel with injection through a porous wall are given in reference 1. As part of the study to guide future experiments, laminar flow in a semiporous channel is investigated herein. In the present investigation, a third-order perturbation solution for laminar incompressible flow in a semiporous channel is presented."
Date: August 1956
Creator: Donoughe, Patrick L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Analysis of particle motions for a class of three-dimensional incompressible laminar boundary layers

Description: From Introduction: "Results obtained in the experimental investigations of secondary flows in turbomachines (refs. 1 to 3) indicate that information concerning three-dimensional laminar boundary-layer behavior can be of practical value in interpreting and correlating measurements of losses in the turbo-machines for design purposes. Reference 4 gives a theoretical analysis of the overturning (more than mainstream turning) of the three-dimensional laminar boundary layer developed on flat or nearl… more
Date: November 1956
Creator: Hansen, Arthur G. & Herzig, Howard Z.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Analysis of Wind-Tunnel Tests to a Mach Number of 0.90 of a Four-Engine Propeller-Driven Airplane Configuration Having a Wing With 40 Degrees of Sweepback and an Aspect Ratio of 10

Description: Report presenting an investigation at speeds of up to Mach number 0.90 to determine the effects of operating propellers on the longitudinal characteristics of a four-engine tractor airplane configuration with a 40 degree swept wing with an aspect ratio of 10. Results regarding low-speed conditions, high-speed conditions, components of lift, effect of configuration changes, longitudinal stability, and the reduction of adverse effects of propellers on stability are provided.
Date: September 1956
Creator: Edwards, George G.; Buell, Donald A.; Demele, Fred A. & Sutton, Fred B.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Analytical determination of the natural coupled frequencies and mode shapes and the response to oscillating forcing functions of tandem helicopters

Description: Report presenting a method for the analytical determination of the natural coupled frequencies and mode shapes of vibrations in the vertical plane of tandem helicopters. That information is then used to calculate the response of the helicopter to applied oscillation forces. Calculated response curves show how the vibrations of the cockpit vary with frequency and method of application of oscillating forces applied at the hubs.
Date: December 1956
Creator: Brooks, George W. & Houbolt, John C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Analytical study of modifications to the autopilot of a fighter airplane in order to reduce the response to side gusts

Description: From Introduction: "This study was the basis for the present paper which deals with means for compensating the roll and yaw response to side gusts of a fighter airplane in combination with an autopilot. Results are presented which compare the response to side gusts of the original and compensating autopilots; the responses to commands are presented also."
Date: March 1956
Creator: Mathews, Charles W. & Adams, James J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Application of Scattering Theory to the Measurement of Turbulent Density Fluctuations by an Optical Method

Description: "An analysis shows that the scattering of unpolarized plane light waves which penetrate turbulent, transparent gases provides a measure of the average integral scale and intensity of the turbulent density fluctuations. The analysis is based upon the scattering coefficient deduced by Booker and Gordon and, thus, assumes isotropic fluctuations having an exponentially decaying (Markoffian) correlation function. Photometric data taken through turbulent boundary layers in air are found to conform fu… more
Date: June 1956
Creator: Stine, Howard A. & Winovich, Warren
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Approximate indicial lift functions for several wings of finite span in incompressible flow as obtained from oscillatory lift coefficients

Description: Report presenting the unsteady-lift functions for a wing undergoing a sudden change in sinking speed for delta wings with three aspect ratios and rectangular and elliptical wings with three aspect ratios. Results regarding the delta-plan-form K1 function, indical spanwise loading distributions, effect of plan-form shape on the K1 function, and effect of aspect ratio on the K1 and K2 functions are provided.
Date: May 1956
Creator: Drischler, Joseph A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Attenuation in a Shock Tube Due to Unsteady-Boundary-Layer Action

Description: "A method is presented for obtaining the attenuation of a shock wave in a shock tube due to the unsteady boundary layer along the shock-tube walls. It is assumed that the boundary layer is thin relative to the tube diameter and induces one-dimensional longitudinal pressure waves whose strength is proportional to the vertical velocity at the edge of the boundary layer. The contributions of the various regions in a shock tube to shock attenuation are indicated" (p. 1).
Date: August 1956
Creator: Mirels, Harold
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Average Properties of Compressible Laminar Boundary Layer on Flat Plate With Unsteady Flight Velocity

Description: Note presenting a determination of the time-average characteristics of boundary layers over a flat plate in nearly quasi-steady flow. The time averages were found without specifying the plate velocity explicitly except that it is positive and has an average value. Some remarks on the heat-transfer problem are also provided.
Date: December 1956
Creator: Moore, Franklin K. & Ostrach, Simon
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Band-Pass Shock and Vibration Absorbers for Application to Aircraft Landing Gear

Description: Note presenting a description of a new class of frequency-selective shock absorbers called band-pass shock absorbers, which were conceived as a means of overcoming some of the limitations of conventional shock absorbers. The shock absorbers may be designed to isolate two bodies from each other over certain ranges of exciting frequencies or rates of load application while coupling them over the remainder of the frequency spectrum.
Date: October 1956
Creator: Schnitzer, Emanuel
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Bending Tests of Ring-Stiffened Circular Cylinders

Description: Twenty-five ring-stiffened circular cylinders were loaded to failure in bending. The results are presented in the form of design curves which are applicable to cylinders with heavy rings that fail as a result of local buckling.
Date: July 1956
Creator: Peterson, James P.
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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