National Advisory Committee for Aeronautics (NACA) - 4,160 Matching Results

Search Results

prev Results: 3937 - 3960 next
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
Partner: UNT Libraries Government Documents Department
open access

A Study of Ceramic Coatings for High-Temperature Protection of Molybdenum

Description: Note presenting some results that have been obtained so far on ceramic coatings for molybdenum. The results indicated that the oxidation of the molybdenum was greatly retarded by the best of the ceramic coatings tried. Protection is possible in oxidizing atmospheres at gas temperatures up to 3500 degrees Fahrenheit.
Date: July 1948
Creator: Moore, D. G.; Bolz, L. H. & Harrison, W. N.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Effect of Strength and Ductility on Burst Characteristics of Rotating Disks

Description: Report presenting an investigation to determine the influence of strength and ductility on the room-temperature burst characteristics of solid disks, disks with large-diameter central holes, and disks with small-diameter central holes. Results regarding the stress concentrations causing fracture, ratio of disk strength to tensile strength, effect of small holes, and evaluation of most ductile materials are provided.
Date: July 1948
Creator: Holms, Arthur G. & Jenkins, Joseph E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Effect of steady rolling on longitudinal and directional stability

Description: Report presenting a theoretical investigation of the effects of steady rolling on the longitudinal and directional stability of aircraft. Simplifying assumptions have been made with regard to the longitudinal and lateral motions of the airplane in order to obtain a solution which shows the principal effects of rolling motion.
Date: June 1948
Creator: Phillips, William H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Investigation of effects of geometric dihedral on low-speed static stability and yawing characteristics of an untapered 45 degree sweptback-wing model of aspect ratio 2.61

Description: Report presenting an investigation to determine the effects of geometric dihedral on the low-speed static stability and yawing characteristics of an untapered 45 degree sweptback wing model of aspect ratio 2.61. Dihedral was found to have an effect on the rolling moment due to sideslip, lift-curve slope, and variation of lateral force with sideslip, but did not have an effect on the yawing moment due to sideslip.
Date: September 1948
Creator: Queijo, M. J. & Jaquet, Byron M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Investigation at Low Speeds of the Effect of Aspect Ratio and Sweep on Static and Yawing Stability Derivatives of Untapered Wings

Description: Report presenting a low-scale wind-tunnel investigation in both straight and yawing flow to determine the effects of aspect ratio and sweep on the static and yawing stability derivatives for a series of untapered wings. The effects of sweep on the static stability characteristics, including lift-curve slope, drag, and effective-dihedral parameter, generally became smaller as the aspect ratio decreased.
Date: August 1948
Creator: Goodman, Alex & Brewer, Jack D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Stress and Distortion Measurements in a 45 Degree Swept Box Beam Subjected to Bending and to Torsion

Description: Note presenting an untapered aluminum-alloy box beam, representing the main structural component of a full-span, two-spar, 45 degree swept wing with a carry-through bay, was subjected to tip bending and twisting loads and its stresses and distortions were measured. The investigation revealed that for bending, the important effect of sweep was to cause a considerable build-up of normal stress and vertical shear stress in the rear spar near the fuselage.
Date: March 1948
Creator: Zender, George & Libove, Charles
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Tests of a 45 degree sweptback-wing model in the Langley gust tunnel

Description: Report presenting a series of tests of a 45 degree sweptback-wing model with and without fuselage and an equivalent straight-wing model in the gust tunnel to provide information on some of the problems encountered in the prediction of gust loads for airplanes incorporating swept wings.
Date: February 1948
Creator: Pierce, Harold B.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

An Investigation of Mechanical Properties of Honeycomb Structures Made of Resin-Impregnated Paper

Description: Note presenting an investigation to determine the order of magnitude of the important mechanical properties of honeycomb-like structures. Some of the characteristics improved by the structure include the rigidity, shear stress at proportional limit, and shear strength as compared to balsa wood. Some of the negative characteristics include the modulus of electricity, compressive stress at proportional limit, compressive strength, and tensile strength.
Date: May 1948
Creator: Norris, C. B. & Mackin, G. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

A metallurgical investigation of five forged gas-turbine discs of Timken alloy

Description: The properties of five discs of Timken alloy at room temperature and 1200 degrees Fahrenheit. Testing occurred short-time tensile, stress-rupture, creep, and hardness along with a metallographic examination of the materials before and after testing. The Timken alloy discs appear to have similar properties to other types of discs.
Date: June 1948
Creator: Freeman, J. W.; Reynolds, E. E. & White, A. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

A metallurgical investigation of two large discs of CSA alloy

Description: Report describing a research program to ascertain the properties of better alloys in the form of large forgings due to the impact of conditions of fabrication. The properties of two discs of CSA alloy were tested at several temperatures. Results regarding hardness surveys, short-time tensile properties, rupture test characteristics, time-deformation characteristics, creep strengths, stability characteristics, and data from tests in other laboratories are provided.
Date: September 1948
Creator: Reynolds, E. E.; Freeman, J. W. & White, A. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

A metallurgical investigation of a contour-forged disc of EME alloy

Description: Report presenting a study of the properties of EME alloy in the form of contour-forged discs for the rotors of gas turbines. The investigation was undertaken because the properties of promising alloys are dependent to a considerable extent on the conditions of fabrication and the size and shape of the rotor discs introduced fabrication procedures for which information was not available. Results regarding hardness surveys, short-time tensile properties, rupture test characteristics, time-deforma… more
Date: November 1948
Creator: Reynolds, E. E.; Freeman, J. W. & White, A. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

A metallurgical investigation of two turbosupercharger discs of 19-9DL alloy

Description: Report presenting testing of two turbosupercharger discs of 19-9DL alloy to determine the properties of the material in forgings of the size actually used in service. The two discs were given hot-cold-working treatments at 1300 to 1350 degrees Fahrenheit and one was treated with a solution. Results regarding the rupture tests, time-deformation characteristics, creep strengths, stability characteristics, and data from another laboratory are provided.
Date: November 1948
Creator: Reynolds, E. E.; Freeman, J. W. & White, A. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

The Stability of the Laminar Boundary Layer in a Compressible Fluid

Description: Note presenting a continuation of a theoretical investigation of the stability of the laminar boundary layer in a compressible fluid. A series of equations are given that provide information related to Reynolds number effects and the physical significance of the stability analysis.
Date: July 1947
Creator: Lees, Lester
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Wind-tunnel investigation of seven thin NACA airfoil sections to determine optimum double-slotted-flap configurations

Description: Report presenting an investigation to determine optimum double-slotted-flap configurations for seven thin NACA airfoil sections. Lift characteristics, pitching moment, and optimum positioning are explored.
Date: April 1948
Creator: Cahill, Jones F. & Racisz, Stanley F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Stresses in and general instability of monocoque cylinders with cutouts 6: calculation of the buckling load of cylinders with side cutout subjected to pure bending

Description: Report presenting a strain-energy theory for the calculation of the buckling load in general instability of circular reinforced monocoque cylinders with a side cutout and subjected to pure bending.
Date: March 1948
Creator: Hoff, N. J.; Klein, Bertram & Boley, Bruno A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Aerodynamics characteristics of 24 NACA 16-series airfoils at Mach numbers between 0.3 and 0.8

Description: Report presenting an investigation to determine the aerodynamic characteristics of a group of NACA 16-series airfoils related in camber and thickness over a range of Mach numbers. All of the currently available force-test data for NACA 16-series airfoils obtained under the same test conditions in the 24-inch high-speed tunnel are presented.
Date: September 1948
Creator: Lindsey, W. F.; Stevenson, D. B. & Daley, Bernard N.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

The damping due to roll of triangular, trapezoidal, and related plan forms in supersonic flow

Description: Report presenting solutions obtained for the damping in roll of triangular, trapezoidal, rectangular, and two swept-back plan forms. The results indicate that as the aspect ratio is increased, the limiting value of the damping in roll for trapezoidal and rectangular plan forms is equal to the value for two-dimensional flow which is twice the limiting value for triangular plan forms.
Date: March 1948
Creator: Jones, Arthur L. & Alksne, Alberta
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Effect of Yaw at Supersonic Speeds on Theoretical Aerodynamic Coefficients of Thin Pointed Wings With Several Types of Trailing Edge

Description: Note presenting expressions for the aerodynamic coefficients of thin pointed wings with three types of trailing edge. The derivation is based on an equation previously derived for the pressure distribution on a thin yawed delta wing at supersonic speeds.
Date: March 1948
Creator: Moeckel, W. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Tensile and Compressive Properties of Laminated Plastics at High and Low Temperatures

Description: Note presenting a determination of the tensile and compressive properties of several types of plastic laminates, which are either in use or have potential application in aircraft structures and parts, at -70, 77, and 200 degrees Fahrenheit. The materials investigated were an unsaturated-polyester laminate with glass fabric as reinforcement and several phenolic laminates with asbestos fabric, high-strength paper, rayon fabric, and cotton fabric as reinforcements. Results regarding tensile proper… more
Date: July 1948
Creator: Lamb, J. J.; Boswell, Isabelle & Axilrod, B. M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Fracture Strength of 75S-T Aluminum Alloy Under Combined Stress

Description: Note presenting a determination of the effect of combined stresses on the fracture strength of 75S-T aluminum alloy by applying axial loads and internal pressure to thin-wall drawn tubes. Tubular extrusions of 75S-T aluminum alloy rupture in substantial agreement with the critical shear stress law for fracture.
Date: July 1948
Creator: Thomsen, E. G.; Lotze, I. & Dorn, J. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Direct-reading design charts for 75S-T aluminum-alloy flat compression panels having longitudinal straight-web Y-section stiffeners

Description: "Direct-reading design charts are presented for 75S-T aluminum-alloy flat compression panels having longitudinal straight-web Y-section stiffeners. These charts make possible the direct determination of the stress and all panel proportions required to carry a given intensity of loading with a given skin thickness and effective length of panel" (p. 1).
Date: August 1948
Creator: Dow, Norris F. & Hickman, William A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Temperature Gradients in the Wing of a High-Speed Airplane During Dives From High Altitudes

Description: Report presenting flight testing to investigate the temperature gradients in the wing structure of a typical high-speed fighter airplane caused by rapid changes in surface temperatures. Reports were carried out using dive testing and measured at multiple points on the airplane.
Date: July 1948
Creator: Tendeland, Thorval & Schlaff, Bernard A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Graphical method of obtaining theoretical lift distributions on thin wings at supersonic speeds

Description: Report presenting a graphical method for calculating the linearized lift distribution on thin wings at supersonic speeds. It can be applied to all wing regions except those influenced by interacting flow fields off the wing-plan boundaries.
Date: August 1948
Creator: Cohen, Clarence B. & Evvard, John C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
Back to Top of Screen