National Advisory Committee for Aeronautics (NACA) - 2,223 Matching Results

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Analysis of harmonic forces produced at hub by imbalances in helicopter rotor blades

Description: From Introduction: "First, an analysis of loads transmitted to the hub by balanced blades will be given. In the second section, the additional loads transmitted to the hub in a direction normal to the plane of rotation of the blades by imbalances in a rotor are derived. In the entire analysis, the results are given in terms of the forces transmitted to the hub by a single rotating helicopter blade in flight, and these are regarded as known or given."
Date: April 1958
Creator: Morduchow, M. & Muzyka, A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Analysis of heat addition in a convergent-divergent nozzle

Description: From Introduction: "The purpose of this report is to treat analytically heat addition heat addition to a divergent stream with initially sonic flow and to employ the results thus obtained in evaluating the effect of delayed combustion on convergent-divergent nozzle performance."
Date: April 1953
Creator: Hearth, Donald P. & Perchonok, Eugene
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Analysis of horizontal-tail loads in pitching maneuvers on a flexible swept-wing jet bomber

Description: From Introduction: "The analysis of flight data in the present report is, to a large extent, based on analyses and information contained in references 1 and 2 for wing deflections, reference 3 for horizontal-tail parameters, reference 4 for airplane lift-curve slopes and angles of zero lift, and reference 5 for wing centers of pressure."
Date: December 1957
Creator: Aiken, William S., Jr.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Analysis of Laminar Forced-Convection Heat Transfer in Entrance Region of Flat Rectangular Ducts

Description: From Introduction: "Beyond the position where the boundary layer treatment can no longer be used, curves have been faired to connect the Nusselt number results of the present analysis with those of reference 3, in which a parabolic velocity profile is assumed throughout the entire duct length. So that a comparison could be made with the results of reference 3, the boundary layer analysis was used to study the development of the temperature profile associated with a parabolic velocity profile th… more
Date: January 1955
Creator: Sparrow, E. M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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An Analysis of Laminar Free-Convection Flow and Heat Transfer About a Flat Plate Parallel to the Direction of the Generating Body Force

Description: From Introduction: "The problem of free-convection flow as produced by a body force about a flat plate in the direction of the body force was studied at the NACA Lewis laboratory and is treated in a formal and more general manner herein. The method used is somewhat similar to that used in reference 4 wherein consideration was given to the free-convection flow at high Grashof numbers in a horizontal cylinder which had a variable surface-temperature distribution. In addition, the numerical soluti… more
Date: February 1952
Creator: Ostrach, Simon
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 Landing-Gear Behavior

Description: Note presenting an analytical study of the behavior of the conventional type of oleo-pneumatic landing gear during the process of landing impact. The basic analysis is presented in a general form and treats the motions of the landing gear prior to and subsequent to the beginning of shock-strut deflection.
Date: August 1952
Creator: Milwitzky, Benjamin & Cook, Francis E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Analysis of Multicell Delta Wings on Cal-Tech Analog Computer

Description: "The main purpose of this paper is to present the results of measurements made on the Cal-Tech computer. The diagrams present only a small portion of the data which were obtained from the computer and which are given in complete form in the tables" (p. 1-2).
Date: December 1953
Creator: MacNeal, Richard H. & Benscoter, Stanley U.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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An analysis of normal-acceleration and airspeed data from a four-engine type of transport airplane in commercial operation on an eastern united states route from November 1947 to February 1950

Description: Report presenting an analysis of 48,187 hours of normal-acceleration and airspeed data obtained on a four-engine type of transport airplane in commercial operation on an eastern United States route from November 1947 to February 1950 to determine gusts and gust loads for operations. Results regarding the presentation of data, effect of changes in operating conditions, effect of seasons, comparison with other results, reliability, acceleration, gusts, and airspeeds are provided.
Date: August 1953
Creator: Coleman, Thomas L. & Schumacher, Paul W. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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An Analysis of Normal Accelerations and Airspeeds of One Type of Twin-Engine Transport Airplane in Commercial Operations Over a Northern Transcontinental Route

Description: Note presenting normal-acceleration and airspeed data obtained for one type of twin-engine transport airplane in commercial operations in order to determine the gust and gust-load experiences of the airplane. Results regarding acceleration experience, gust experience, seasonal effects, and effect of special operating restriction are provided.
Date: November 1952
Creator: Steiner, Roy
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Analysis of operational airline data to show the effects of airborne weather radar on the gust loads and operating practices of twin-engine short-haul transport airplanes

Description: From Introduction: "The data for operations both with and without radar installed have been analyzed and the results are presented in this paper. Although these results are of limited extent, they provide a basis for early examination of any trends in the gust loads and associated operating practices which might be attributed to the use of radar."
Date: November 1957
Creator: Copp, Martin R. & Walker, Walter G.
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 Pure-Bending Flutter of a Cantilever Swept Wing and Its Relation to Bending-Torsion Flutter

Description: From Introduction: "The present paper is intended to give some features of flutter in bending alone and contains results of analyses made to determine some effects of wing mass-density ratio, angle of sweepback, length-semichord ratio, and Mach number. Some relations of pure-blending flutter to the conventional bending-torsion flutter are also given."
Date: September 1951
Creator: Cunningham, H. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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An Analysis of Ramjet Engines Using Supersonic Combustion

Description: From Introduction: "The concept of supersonic combustion is by no means new, although little work appears to have been published on the subject. For example, an analysis of supersonic combustion to provide lift under a wing is given in reference 1. Reference 2 discusses applications to hypersonic ramjets being studied at the University of Michigan."
Date: September 1958
Creator: Weber, Richard J. & MacKay, John S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Analysis of shear strength of honeycomb cores for sandwich constructions

Description: From Introduction: "In the present report an analysis was undertaken to arrive at a mathematical formula by which the shear strengths of honeycomb core materials could be calculated. Experimental verification of the formula of the present paper was obtained by tests of honeycomb-type sheets of resin-impregated paper; two groups of specimens were tested, each of which represented a different resin-impregation treatment of the basic paper."
Date: October 1950
Creator: Werren, Fred & Norris, Charles Brazer
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Analysis of shock motion in ducts during disturbances in downstream pressure

Description: From Summary: "The effect of small downstream pressure distributions on the position of a normal shock in a duct with area variation is analyzed. For the analysis, the gas flow is treated as quasi-one-dimensional, and boundary layer is neglected. The analysis shows that there is a first-order lag relation between shock position and small downstream disturbances in pressure which occur at frequencies below a given limit."
Date: September 1957
Creator: Hurrell, Herbert G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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An analysis of shock-wave cancellation and reflection for porous walls which obey an exponential mass-flow pressure-difference relation

Description: From Introduction: "In the present report a generalized exponential relation between pressure difference and normal flow is assumed which adequately describes porous-wall calibrations obtained experimentally at the Ames Laboratory and those presented in references 1 and 3."
Date: August 1954
Creator: Spiegel, Joseph M. & Tunnell, Phillips J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Analysis of Static Aeroelastic Behavior of Low-Aspect-Ratio Rectangular Wings

Description: "Slender-body theory is used in conjunction with late theory to analyze the static aeroelastic-divergence behavior of low-aspect-ratio rectangular wings of constant thickness when chordwise deformations are considered. In the analysis, the spanwise variation of the deflection is restricted to a parabola but the chordwise variation is allowed complete freedom. Results show the variation of the divergence speed and mode shape with the aspect ratio" (p. 1).
Date: April 1957
Creator: Hedgepeth, John M. & Waner, Paul G., Jr.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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An Analysis of Statically Indeterminate Trusses Having Members Stressed Beyond the Proportional Limit

Description: "A procedure for analyzing statically indeterminate trusses in the plastic stress range is presented which is applicable to trusses having any number of redundant members. A numerical example is used to illustrate the procedure" (p. 1).
Date: February 1953
Creator: Wilder, Thomas W., III
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Analysis of Straight Multicell Wings on Cal-Tech Analog Computer

Description: Note presenting structural analyses made for four straight multicell wings. Wings with aspect ratios of 2 and 4 with rectangular and biconvex cross sections have been considered. The results indicated that under bending loads, all of the wings show fairly good agreement with beam theory.
Date: January 1954
Creator: Benscoter, Stanley U. & MacNeal, Richard H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Analysis of stresses in the plastic range around a circular hole in a plate subjected to uniaxial tension

Description: From Introduction: "The present paper considers the problem of finding the stresses in the plastic range around a circular hole in an infinite plate subjected to uniaxial tension at infinity (fig.1)."
Date: October 1955
Creator: Budiansky, Bernard & Vidensek, Robert J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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An Analysis of Supersonic Flow in the Region of the Leading Edge of Curved Airfoils, Including Charts for Determining Surface-Pressure Gradient and Shock-Wave Curvature

Description: Note presenting an investigation of the inviscid flow in the region of the leading edge of curved airfoils with attached shock waves. Tables and charts are presented for determining the surface-pressure gradient and the shock-wave curvature in supersonic flow of an ideal diatomic gas. An approximate procedure for determining the flow field a short distance downstream of the leading edge is also presented.
Date: June 1952
Creator: Kraus, Samuel
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Analysis of Sweptback Wings on Cal-Tech Analog Computer

Description: Note presenting structural analyses made of two 45 degree swept wings of aspect ratio 3. One has a constant depth and the other had a constant biconvex cross section in planes parallel to the air stream. Deflections, all internal forces, and vibration modes have been calculated for concentrated static loads.
Date: January 1954
Creator: MacNeal, Richard H. & Benscoter, Stanley U.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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