National Advisory Committee for Aeronautics (NACA) - 46 Matching Results

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Stresses in and general instability of monocoque cylinders with cutouts 5: calculation of the stresses in cylinders with side cutout

Description: "Stresses were calculated by a numerical method in three reinforced monocoque cylinders subjected to pure bending. The cylinders were of circular cross section and were reinforced with 8 rings and either 8 or 16 stringers. There was a cutout on one side of each cylinder located symmetrically to the neutral plane and extending over 45, 90, or 135 degrees" (p. 1).
Date: January 1948
Creator: Hoff, N. J. & Klein, Bertram
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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A method of cycle analysis for aircraft gas-turbine power plants driving propellers

Description: Report presenting an investigation to develop a convenient and accurate method for analyzing gas-turbine cycles to aid in predicting the performance of propeller-driving power plants and the state of the gas at various stations within the power plant. The method takes into account the effects of ram, altitude, variation of specific heats, increase in weight flow due to the addition of fuel, and thrusts from the exhaust jet.
Date: January 1948
Creator: English, Robert E. & Hauser, Cavour H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Charts for the Analysis of One-Dimensional Steady Compressible Flow

Description: Report presenting charts of dimensionless parameters to facilitate the computation involved in the solution of equations of one-dimensional steady flow of a compressible field. The charts can be used for analyses involving constant or variable specific heats in the subsonic and supersonic ranges.
Date: January 1948
Creator: Turner, L. Richard; Addie, Albert N. & Zimmerman, Richard H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Comparison of computed performance of composite power plants using 18-cylinder aircraft engines with 62 degrees and 40 degrees valve overlap

Description: Report presenting calculations based on experimental data for 18-cylinder, radial aircraft engines with different nominal valve overlaps to compare the performance of two composite power plants using the engines. The composite unit included a steady-flow turbine and an auxiliary supercharger mounted on a common shaft and geared to the engine crankshaft. Results regarding the reciprocating-engine component, composite engine, effect of turbine characteristics, and performance with afterburning ar… more
Date: January 1948
Creator: Kaufman, Samuel J. & Boman, David S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Sideslip Angles and Vertical-Tail Loads Developed by Periodic Control Deflections

Description: Note presenting a consideration of dynamic maneuvers consisting of periodic rudder and aileron control deflections with respect to the maximum sideslip angles developed and the position of the rudder at the time of maximum sideslip. A method is also given for computing the maximum sideslip angles when the forces and moments are nonlinear functions of the sideslip.
Date: January 1948
Creator: Lomax, Harvard
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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The use of source-sink and doublet distributions extended to the solution of boundary value problems in supersonic flow

Description: Report presenting a direct analogy between the use of source-sink and doublet distributions in the solution of arbitrary boundary value problems in subsonic wing theory and the corresponding problems in supersonic theory. The concept of the "finite part" of an integral is introduced and used in the calculation of the improper integrals associated with supersonic doublet distributions.
Date: January 1948
Creator: Heaslet, Max A. & Lomax, Harvard
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Cylinder-temperature and cooling-air-pressure instrumentation for air-cooled-engine cooling investigations

Description: "A description of the types and the locations of pressure tubes and thermocouples satisfactorily used by NACA in multicylinder-engine cooling investigations is presented. The advantages and disadvantages of the various types of pressure tube and thermocouple are discussed with regard to reliability, durability, and ease of installation" (p. 1).
Date: January 1948
Creator: Valerino, Michael F. & Kaufman, Samuel J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Flight measurements of the lateral and directional stability and control characteristics of an airplane having a 35 degree sweptback wing with 40-percent-span slots and a comparison with wind-tunnel data

Description: Report presenting flight tests conducted to determine the lateral and directional stability and control characteristics of an airplane on which the wing panels are swept back 35 degrees. The wings were equipped with slots extending from 40 to 80 percent of the span of the sweptback wing panels measured from the inboard end. Results regarding the steady sideslips, dynamic directional stability, rudder kicks, and aileron rolls are provided.
Date: January 1948
Creator: Sjoberg, S. A. & Reeder, J. P.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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A Graphical Method for Interpolation of Specific Flying Boats From Collapsed Results of General Tests of Flying-Boat-Hull Models

Description: Note presenting a simple and rapid method for interpolating the hydrodynamic characteristics of specific flying boats from a chart presenting test results in collapsed form. The method is graphical and will allow interpolation of the hydrodynamic characteristics for any combination of load or aerodynamic characteristics. The charts consider the effect of wing and flap setting, effect of hull size, effect of wing size, effect of weight, and some miscellaneous data.
Date: January 1948
Creator: Locke, F. W. S., Jr.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Dislocation Theory of the Fatigue of Metals

Description: Note presenting a dislocation theory of fatigue failure for annealed solid solutions. An equation giving the dependence of the number of cycles for failure on the stress, the temperature, the material parameters, and the frequency is derived for uniformly stressed specimens. The equation is found to be in quantitative agreement with the data.
Date: January 1948
Creator: Machlin, E. S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Performance tests of wire strain gages 6: effect of temperature on calibration factor and gage resistance

Description: Report presenting results of testing to determine the variation in calibration factor and gage resistance with temperature are presented for 15 types of single-element, multistrand wire strain gage. More than half of the gages tested were relatively insensitive to changes in temperature.
Date: January 1948
Creator: Campbell, William R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Development of cast aluminum alloys for elevated-temperature service

Description: Report presenting an experimental investigation to develop an aluminum alloy for service at elevated temperatures. The investigation was divided into three parts: (1) The effects of heat treatment and exposure to elevated temperatures on the tensile properties of alloys cooled to room temperature, (2) the effect of alloy additions on the room temperature and elevated-temperature properties of aluminum, 6-percent-magnesium alloys, and (3) the improvement in high-temperature creep properties of s… more
Date: January 1948
Creator: Hodge, Webster; Eastwood, L. W.; Lorig, C. H. & Cross, H. C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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An Improved Photoelastic Method for Determining Plane Stresses

Description: Note presenting an improved photoelastic method that has been developed for determining stress concentrations which occur in nonisotropic materials under load. Drucker's method has been extended by means of an additional oblique photograph, and simpler equations for relating fringe order to principal stresses were obtained. The conclusion indicates that the improved oblique method of photoelastic analysis yields reasonably accurate results over regions of the photoelastic model which are not su… more
Date: January 1948
Creator: Norris, C. B. & Voss, A. W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Indirect Methods for Obtaining Ram-Jet Exhaust-Gas Temperature Applied to Fuel-Metering Control

Description: Memorandum presenting an analytical method developed that gives two independent means of obtaining the total-temperature ratio across a ram jet or across a turbojet tail-pipe burner without direct measurement of the final gas temperature. Experimental verification of the analysis has been obtained with a 20-inch ram jet over a wide range of operating conditions.
Date: January 14, 1948
Creator: Perchonok, Eugene; Sterbentz, William H. & Moore, Stanley H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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High-Speed Aerodynamic Characteristics of a Model Tail Plane with Modified NACA 65-010 Sections and 0 Degree and 45 Degrees Sweepback

Description: Memorandum presenting wind-tunnel tests that have been made to determine the aerodynamic characteristics of a model tail plane with modified NACA 65-010 sections and a tapered plan form. Results were obtained with the model tail plane unswept and swept back. The data show the lift, drag, pitching-moment, and hinge-moment coefficient variation with angle of attack and flap deflection at various Mach numbers.
Date: January 12, 1948
Creator: Anderson, Joseph L. & Martin, Andrew
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Cyclic Engine Test of Cast Vitallium Turbine Buckets 2

Description: Memorandum presenting an investigation conducted to provide data that may be used to correlate the engine service performance of cast Vitallium turbine buckets with metallurgical properties. Data were obtained from four turbine wheels of Timken alloy with cast Vitallium buckets. Examination of 12 broken buckets indicated that 8 of the failures were probably caused by fatigue and 4 by impact with pieces of other broken buckets.
Date: January 12, 1948
Creator: Farmer, J. Elmo; Deutsch, George C. & Sikora, Paul F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Experimental investigation at supersonic speeds of twin-scoop duct inlets of equal area I : an inlet enclosing 61.5 percent of the maximum circumference of the forebody

Description: Report presenting tests at Mach numbers between 1.36 and 2.01 of a twin-scoop air intake enclosing 61.5 percent of the maximum circumference of a body of revolution and located five forebody diameters behind the apex, which showed that the total pressure recovered after diffusion was about 10 percent greater than that attained in previous tests with an annular entrance of the same area.
Date: January 21, 1948
Creator: Davis, Wallace F. & Goldstein, David L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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High-Speed Wind-Tunnel Tests of a Model Pursuit Airplane and Correlation With Flight-Test Results

Description: Report presenting the results of tests on a model of a jet-propelled airplane and a comparison of drag, maximum lift coefficient, and elevator angle required for level flight in the wind tunnel and in flight. Results regarding the aerodynamic characteristics, longitudinal control, wing pressure distribution, and dive-recovery flaps are provided.
Date: January 21, 1948
Creator: Cleary, Joseph W. & Gray, Lyle J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Tests of a triangular wing of aspect ratio 2 in the Ames 12-foot pressure wind tunnel. 1: the effect of Reynolds number and Mach number on the aerodynamic characteristics of the wing with flap undeflected

Description: Report presenting testing of a semispan model of a wing of triangular plan form and aspect ratio 2 in the 12-foot pressure tunnel to determine the aerodynamic characteristics of the wing as influenced by the independent effects of Reynolds number and Mach number up to Mach numbers approaching unity. Results regarding the effect of body and effect of wing-profile modification are also provided.
Date: January 22, 1948
Creator: Edwards, George G. & Stephenson, Jack D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Flight Investigation of a 20-Inch-Diameter Steady-Flow Ram Jet

Description: Memorandum presenting a flight investigation conducted on a 20-inch-diameter steady-flow ramjet at a range of altitudes and free-stream Mach numbers. Results regarding the variation of combustion efficiency with fuel-air ratio and pressure altitude, effects of combustion-chamber-inlet velocity, and altitude on the operating range of fuel-air ratio are provided. The ramjet unit operated smoothly over the entire range of velocities and altitudes with the exception of occasional rough operation at… more
Date: January 14, 1948
Creator: Disher, John H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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A Study of Skin Temperatures of Conical Bodies in Supersonic Flight

Description: Memorandum presenting a comparison between the time history of skin temperature measured on the nose of a V-2 and the temperature computed using Eber's experimental relation for heat-transfer coefficients for conical bodies under supersonic conditions. A general method developed for making skin-temperature calculations is used to compute the variation of skin temperature with time for a wide range of values of the pertinent parameters. Results regarding the validity of skin-temperature calculat… more
Date: January 29, 1948
Creator: Huston, Wilber B.; Warfield, Calvin N. & Stone, Anna Z.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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