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The inward bulge type buckling of monocoque cylinders 4: experimental investigation of cylinders subjected to pure bending

Description: Eighteen 24S-T alclad cylinders of 20-inch diameter, with skin thickness varying between 0.012 inch and 0.025 inch and length varying between 40.5 inches and 64 inches, were tested in pure bending. They were reinforced with either 16 or 28 stringers and either 5 or 6 rings. One of the purposes of the investigation was to establish the critical value above which failure would occur by general instability and below which panel instability would take place. This value was found to be between 20 an… more
Date: September 1948
Creator: Hoff, N. J.; Boley, Bruno A. & Nardo, S. V.
Partner: UNT Libraries Government Documents Department
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Effect of Reynolds Number in Turbulent-Flow Range on Flame Speeds of Bunsen-Burner Flames

Description: Note presenting an investigation of the effect of flow conditions on the geometry of the turbulent Bunsen flame. Data are presented showing the effect of Reynolds number of flow in the range of 3000 to 35,000 on flame speed for burner diameters from 1/8 to 1 1/8 inches and three fuels - acetylene, ethylene, and propane. Results regarding the geometry of the turbulent Bunsen flames, turbulent flame speeds, nature of turbulence in pipe flow, theories of turbulent flame speed, and the nature of va… more
Date: September 1948
Creator: Bollinger, Lowell M. & Williams, David T.
Partner: UNT Libraries Government Documents Department
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Theoretical characteristics in supersonic flow of constant-chord partial-span control surfaces on rectangular wings having finite thickness

Description: Report exploring the use of the Busemann third-order approximation for two-dimensional isentropic flow used in suitable conjunction with three-dimensional solutions found by the linearized theory to determine analytically, for small angles of attack and control deflections, the control-surface characteristics of partial-span constant-chord flaps on rectangular wings having finite thickness. Equations are provided for lift coefficient, rolling-moment coefficient, and hinge-moment coefficient due… more
Date: September 1948
Creator: Tucker, Warren A. & Nelson, Robert L.
Partner: UNT Libraries Government Documents Department
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Minimum-Weight Design of Simply Supported Transversely Stiffened Plates Under Compression

Description: Note presenting an investigation of the weight of a simply supported transversely stiffened compression panel subjected to a given buckling load as a function of the stiffener spacing, plate thickness, and the geometry of the stiffener cross section. Results indicate that there are particular combinations of stiffener spacing and plate thickness, dependent on the geometrical properties of the stiffener cross section, for which the panel weight is a minimum.
Date: September 1948
Creator: Gomza, Alexander & Seide, Paul
Partner: UNT Libraries Government Documents Department
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Analytical Method of Determining Transmission of Particles and Radiation Through Great Thickness of Matter

Description: "A matrix method of determining transmission, scattering, and absorption of radiation, such as gamma rays and neutrons, in large thickness of matter is presented. Experimental data as yet unavailable are required for complete utilization of the method. Material radioactivity whose intensity may be considered to be independent of time is also treated" (p. 1).
Date: September 1948
Creator: Bobrowsky, A. R.
Partner: UNT Libraries Government Documents Department
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Analysis of Performance of a Jet Engine From Characteristics of Components 2: Interaction of Components as Determined From Engine Operation

Description: Report presenting an investigation of a method to analyze and to estimate performance of jet engines, which was applied to the study of the characteristics of a research turbojet engine built for the investigation. Results regarding the compressor performance, turbine performance, combustion chamber, and interaction of jet engine components are provided.
Date: September 1948
Creator: Goldstein, Arthur W.; Alpert, Sumner; Beede, William & Kovach, Karl
Partner: UNT Libraries Government Documents Department
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Analytical and experimental performance of an explosion-cycle combustion chamber for a jet-propulsion engine

Description: From Introduction: "The results of analytical and experimental investigations conducted at the NACA Cleveland laboratory to determine the performance of an explosion-cycle combustion chamber with a timed inlet valve and several fixed-area exhaust nozzles are presented herein. These values are compared with theoretical values obtained from an analysis of an ideal constant-volume cycle and an approximate constant-volume cycle, which is presented."
Date: September 1948
Creator: Zipkin, Morris A. & Lewis, George W., Jr.
Partner: UNT Libraries Government Documents Department
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Experimental investigation of the effects of plastic flow in a tension panel with a circular hole

Description: Report presenting seven uniformly dimensioned 24S-T tension panels with a central circular hole subjected to various loads in order to study the effects of plastic flow at the point of maximum stress concentration. Results regarding the elastic behavior and plastic behavior are provided.
Date: September 1948
Creator: Griffith, George E.
Partner: UNT Libraries Government Documents Department
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A linearized solution for time-dependent velocity potentials near three-dimensional wings at supersonic speeds

Description: Report presenting a source-distribution method for deriving a solution for the time-dependent surface velocity potential of thin finite wings at supersonic speeds. It is illustrated by evaluating the upwash over the tip of an arbitrary-plan-boundary wing with a supersonic and subsonic leading edge.
Date: September 1948
Creator: Evvard, John C.
Partner: UNT Libraries Government Documents Department
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Mollier diagrams for air saturated with water vapor at low temperatures

Description: Report presenting two Mollier diagrams relating the thermodynamic properties of air saturated with water vapor in equilibrium with water and with ice at low temperatures. The range of the charts created includes temperatures of 400 to 540 degrees R and a pressure range of 2 to 28 pounds per square inch absolute in order to provide the greatest utility concerning icing of aircraft.
Date: September 1948
Creator: Hensley, Reece V.
Partner: UNT Libraries Government Documents Department
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A metallurgical investigation of two contour forged gas-turbine discs of 19-9DL 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. 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: Freeman, J. W.; Reynolds, E. E. & White, A. E.
Partner: UNT Libraries Government Documents Department
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Bearing strengths of some aluminum-alloy rolled and extruded sections

Description: Report presenting testing to determine bearing yield and ultimate strengths for several sizes of rolled and extruded 14S sections and of rolled 24S-T and 75S-T bar. Results regarding the yield strengths, bearing failures, strength values, and ratios of bearing to tensile properties are provided.
Date: September 1948
Creator: Moore, R. L.
Partner: UNT Libraries Government Documents Department
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The Stability Derivatives of Low-Aspect-Ratio Triangular Wings at Subsonic and Supersonic SPeeds

Description: "Low-aspect-ratio wings having triangular plan forms are treated on the assumption that the flow potentials in planes at right angles to the long axis of the airfoils are similar to the corresponding two-dimensional potentials. Pressure distributions caused by downward acceleration, pitching, rolling, sideslipping, and yawing are obtained for wings with and without dihedral. The stability derivatives calculated from these distributions are expected to apply at both subsonic and supersonic speed… more
Date: September 1948
Creator: Ribner, Herbert S.
Partner: UNT Libraries Government Documents Department
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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.
Partner: UNT Libraries Government Documents Department
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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.
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.
Partner: UNT Libraries Government Documents Department
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Experimental and calculated characteristics of several high-aspect-ratio tapered wings incorporating NACA 44-series, 230-series, and low-drag 64- series airfoil sections

Description: Report presenting the lift, drag, and pitching-moment characteristics of several unswept wings as determined by wind-tunnel testing and calculations. The aerodynamic characteristics of the wings were determined experimentally for the smooth and rough model conditions with flaps neutral and partial-span and full-span split flaps deflected 60 degrees.
Date: September 1948
Creator: Bollech, Thomas V.
Partner: UNT Libraries Government Documents Department
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A preliminary evaluation of the use of ground radar for the avoidance of turbulent clouds

Description: Report presenting a preliminary analysis of data obtained from 1946 operations of the US Weather Bureau thunderstorm project in Florida, which indicate that considerable differences exist between the magnitude and frequency of gusts encountered within areas of ground-radar echo and those encountered in surrounding areas. An appreciable reduction in gust experience can be achieved by circumnavigation of areas of radar echo caused by air-mass convective storms.
Date: September 1948
Creator: Press, H. & Binckley, E. T.
Partner: UNT Libraries Government Documents Department
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Theoretical and Experimental Wing-Tip Accelerations of a Small Flying Boat During Landing Impacts

Description: Note presenting a simplified analytical method for predicting the time history of the accelerations along the wing of an airplane during landing impact and a comparison with wing-tip-acceleration data obtained from full-scale landing tests of a small seaplane. A sine curve is used as an approximation for the force-time variation of the measured impact force and agrees fairly closely with the experimental impact-force time histories up to and somewhat beyond the time of maximum impact load.
Date: September 1948
Creator: Savitsky, Daniel
Partner: UNT Libraries Government Documents Department
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Determination of Bending Moments in Pressure-Loaded Rings of Arbitrary Shape When Deflections Are Considered

Description: Note presenting an analytical method derived for determining bending-moment distribution in rings of arbitrary shape under internal pressure loads, with the change of geometric shapes caused by the load being considered. Charts have been provided for two specific families of rings of various proportions and flexibilities. The results obtained with the method showed good agreement with test data and proved that results obtained when change of geometric shape was not considered are inadequate for… more
Date: September 1948
Creator: Steinbacher, F. R. & Lo, Hsu
Partner: UNT Libraries Government Documents Department
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An analysis of the airspeeds and normal accelerations of Martin M-130 airplanes in commercial transport operation

Description: From Introduction: "Acceleration and airspeed data obtained from V-G records collected during commercial transport operations (references 1 and 2) are being analyzed in some detail to determine the flight loads and operating speeds as functions of airplane, route, season, and prewar and wartime operations."
Date: September 1948
Creator: Walker, Walter G.
Partner: UNT Libraries Government Documents Department
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Effect of pressure recovery on the performance of a jet-propelled airplane

Description: Report presenting a study made to evaluate the effect of pressure recovery on the performance of a typical jet engine and a typical jet-propelled fighter airplane. Results regarding the efficiency parameters for air-induction systems, effect of ram-recovery ratio on the performance of a turbojet engine, and the effect of ram-recovery ratio on the performance of a turbojet airplane are provided.
Date: September 1948
Creator: Hanson, Frederick H., Jr. & Mossman, Emmet A.
Partner: UNT Libraries Government Documents Department
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The inward bulge type buckling of monocoque cylinders 5: revised strain energy theory which assumes a more general deflected shape at buckling

Description: Report presenting a strain energy theory developed for the calculation of the critical load for the inward bulge type of general instability of reinforced monocoque cylinders subjected to pure bending. The theory is applied to two representative cylinders of the GALCIT test series and to two of the PIBAL series.
Date: September 1948
Creator: Hoff, N. J.; Klein, Bertram & Boley, Bruno A.
Partner: UNT Libraries Government Documents Department
open access

An experimental investigation at supersonic speeds of annular duct inlets situated in a region of appreciable boundary layer

Description: Report presenting annular air inlets situated several diameters behind the apex of various bodies of revolution tested over the range of Mach numbers between 1.36 and 2.01 to determine the effects of relatively thick boundary layers on the characteristics of duct entrances in supersonic flight. Results regarding the presentation of data, precision, and general flow characteristics are provided.
Date: September 1948
Creator: Davis, Wallace F.; Brajnikoff, George B.; Goldstein, David L. & Speigel, Joseph M.
Partner: UNT Libraries Government Documents Department
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