Latest content added for UNT Digital Library Partner: UNT Libraries Government Documents Departmenthttps://digital.library.unt.edu/explore/partners/UNTGD/browse/?fq=str_title_serial:NACA+Technical+Reports&sort=creator&fq=untl_collection:TRAIL&start=14002014-03-30T18:00:15-05:00UNT LibrariesThis is a custom feed for browsing UNT Digital Library Partner: UNT Libraries Government Documents DepartmentCorrelation of Exhaust-Valve Temperatures With Engine Operating Conditions and Valve Design in an Air-Cooled Cylinder2011-11-17T17:13:32-06:00https://digital.library.unt.edu/ark:/67531/metadc60093/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc60093/"><img alt="Correlation of Exhaust-Valve Temperatures With Engine Operating Conditions and Valve Design in an Air-Cooled Cylinder" title="Correlation of Exhaust-Valve Temperatures With Engine Operating Conditions and Valve Design in an Air-Cooled Cylinder" src="https://digital.library.unt.edu/ark:/67531/metadc60093/small/"/></a></p><p>"A semiempirical equation correlating exhaust-valve temperatures with engine operating conditions and exhaust-valve design has been developed. The correlation is based on the theory correlating engine and cooling variables developed in a previous NACA report. In addition to the parameters ordinarily used in the correlating equation, a term is included in the equation that is a measure of the resistance of the complex heat-flow paths between the crown of the exhaust valve and a point on the outside surface of the cylinder head" (p. 103).</p>The General Theory of Blade Screws Including Propellers, Fans, Helicopter Screws, Helicoidal Pumps, Turbo-Motors, and Different Kinds of Helicoidal Blades2011-11-17T22:13:23-06:00https://digital.library.unt.edu/ark:/67531/metadc65648/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc65648/"><img alt="The General Theory of Blade Screws Including Propellers, Fans, Helicopter Screws, Helicoidal Pumps, Turbo-Motors, and Different Kinds of Helicoidal Blades" title="The General Theory of Blade Screws Including Propellers, Fans, Helicopter Screws, Helicoidal Pumps, Turbo-Motors, and Different Kinds of Helicoidal Blades" src="https://digital.library.unt.edu/ark:/67531/metadc65648/small/"/></a></p><p>Report presents a theory which gives a complete picture and an exact quantitative analysis of the whole phenomenon of the working of blade screws, but also unites in a continuous whole the entire scale of states of work conceivable for a blade screw. Chapter 1 is devoted to the establishment of the system of fundamental equations relating to the blade screw. Chapter 2 contains the general discussion of the 16 states of work which may establish themselves for a blade screw. Chapter 3 is devoted to the study of the propulsive screw or propeller.</p>General Theory of the Steady Motion of an Airplane2011-11-17T22:13:23-06:00https://digital.library.unt.edu/ark:/67531/metadc65747/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc65747/"><img alt="General Theory of the Steady Motion of an Airplane" title="General Theory of the Steady Motion of an Airplane" src="https://digital.library.unt.edu/ark:/67531/metadc65747/small/"/></a></p><p>The writer points out briefly the history of the method proposed for the study of steady motion of an airplane, which is different from other methods now used. M. Paul Painleve has shown how convenient the drag-lift curve was for the study of airplane steady motion. The author later added to the drift-lift curve the curve called the "speed curve" which permits a direct checking of the speed of the airplane under all flying conditions. But the speed curve was plotted in the same quadrant as the drag-lift curve.</p>An Introduction to the Laws of Air Resistance of Aerofoils2014-03-22T10:27:53-05:00https://digital.library.unt.edu/ark:/67531/metadc277411/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc277411/"><img alt="An Introduction to the Laws of Air Resistance of Aerofoils" title="An Introduction to the Laws of Air Resistance of Aerofoils" src="https://digital.library.unt.edu/ark:/67531/metadc277411/small/"/></a></p><p>Report presents methods of calculating air resistance of airfoils under certain conditions of flow phenomena around the airfoil.</p>A low-speed experimental investigation of the effect of a sandpaper type of roughness on boundary-layer transition2011-11-17T17:13:32-06:00https://digital.library.unt.edu/ark:/67531/metadc60764/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc60764/"><img alt="A low-speed experimental investigation of the effect of a sandpaper type of roughness on boundary-layer transition" title="A low-speed experimental investigation of the effect of a sandpaper type of roughness on boundary-layer transition" src="https://digital.library.unt.edu/ark:/67531/metadc60764/small/"/></a></p><p>From Summary: "An investigation was made in the Langley low-turbulence pressure tunnel to determine the effect of size and location of a sandpaper type of roughness on the Reynolds number for transition. Transition was observed by means of a hot-wire anemometer located at various chordwise stations for each position of the roughness. These observations indicated that when the roughness is sufficiently submerged in the boundary layer to provide a substantially linear variation of boundary-layer velocity with distance from the surface up to the top of the roughness, turbulent "spots" begin to appear immediately behind the roughness when the Reynolds number based on the velocity at the top of the roughness height exceeds a value of approximately 600. At Reynolds numbers even slightly below the critical value (value for transition), the sandpaper type of roughness introduced no measurable disturbances into the laminar layer downstream of the roughness. The extent of the roughness area does not appear to have an important effect on the critical value of the roughness Reynolds number."</p>Determination of general relations for the behavior of turbulent boundary layers2011-11-17T17:13:32-06:00https://digital.library.unt.edu/ark:/67531/metadc60040/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc60040/"><img alt="Determination of general relations for the behavior of turbulent boundary layers" title="Determination of general relations for the behavior of turbulent boundary layers" src="https://digital.library.unt.edu/ark:/67531/metadc60040/small/"/></a></p><p>From Summary: "An analysis has been made of a considerable amount of data for turbulent boundary layers along wings and bodies of various shapes in order to determine the fundamental variables that control the development of turbulent boundary layers. It was found that the type of velocity distribution in the boundary layer could be expressed in terms of a single parameter. This parameter was chosen as the ratio of the displacement thickness to the momentum thickness of the boundary layer. The variables that control the development of the turbulent boundary layer apparently are: (1) the ratio of the nondimensional pressure gradient, expressed in terms of the local dynamic pressure outside the boundary layer and boundary-layer thickness, to the local skin-friction coefficient and (2) the shape of the boundary layer. An empirical equation has been developed in terms of these variables that, when used with the momentum equation and the skin-friction relation, makes it possible to trace the development of the turbulent boundary layer to the separation point."</p>On the Theory of Laminar Boundary Layers Involving Separation2011-11-17T22:13:23-06:00https://digital.library.unt.edu/ark:/67531/metadc65686/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc65686/"><img alt="On the Theory of Laminar Boundary Layers Involving Separation" title="On the Theory of Laminar Boundary Layers Involving Separation" src="https://digital.library.unt.edu/ark:/67531/metadc65686/small/"/></a></p><p>"This paper presents a mathematical discussion of the laminar boundary layer, which was developed with a view of facilitating the investigation of those boundary layers in particular for which the phenomenon of separation occurs. The treatment starts with a slight modification of the form of the boundary layer equation first published by Von Mises. Two approximate solutions of this equation are found, one of which is exact at the outer edge of the boundary layer while the other is exact at the wall" (p. 541).</p>Aerodynamic Characteristics of Aerofoils2011-11-17T22:13:23-06:00https://digital.library.unt.edu/ark:/67531/metadc65743/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc65743/"><img alt="Aerodynamic Characteristics of Aerofoils" title="Aerodynamic Characteristics of Aerofoils" src="https://digital.library.unt.edu/ark:/67531/metadc65743/small/"/></a></p><p>The object of this report is to bring together the investigations of the various aerodynamic laboratories in this country and Europe upon the subject of aerofoils suitable for use as lifting or control surfaces on aircraft. The data have been so arranged as to be of most use to designing engineers and for the purposes of general reference. The absolute system of coefficients has been used, since it is thought by the National Advisory Committee for Aeronautics that this system is the one most suited for international use, and yet is one for which a desired transformation can be easily made. For this purpose a set of transformation constants is included in this report.</p>Aerodynamic Characteristics of Aerofoils 2: Continuation of Report No. 932011-11-17T22:13:23-06:00https://digital.library.unt.edu/ark:/67531/metadc65774/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc65774/"><img alt="Aerodynamic Characteristics of Aerofoils 2: Continuation of Report No. 93" title="Aerodynamic Characteristics of Aerofoils 2: Continuation of Report No. 93" src="https://digital.library.unt.edu/ark:/67531/metadc65774/small/"/></a></p><p>"This collection of data on aerofoils has been made from the published reports of a number of the leading aerodynamic laboratories of this country and Europe. The information which was originally expressed according to the different customs of the several laboratories is here presented in a uniform series of charts and tables suitable for the use of designing engineers and for purposes of general reference. The absolute system of coefficients has been used, since it is thought by the National Advisory Committee for Aeronautics that this system is the one most suited for international use, and yet is one for which a desired transformation can be easily made" (p. 423).</p>Aerodynamic Characteristics of Airfoils 3: Continuation of Reports Nos. 93 and 1242011-11-17T22:13:23-06:00https://digital.library.unt.edu/ark:/67531/metadc65832/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc65832/"><img alt="Aerodynamic Characteristics of Airfoils 3: Continuation of Reports Nos. 93 and 124" title="Aerodynamic Characteristics of Airfoils 3: Continuation of Reports Nos. 93 and 124" src="https://digital.library.unt.edu/ark:/67531/metadc65832/small/"/></a></p><p>"This collection of data on airfoils has been made from the published reports of a number of the leading aerodynamic laboratories of this country and Europe. The information which was originally expressed according to the different customs of the several laboratories is here presented in a uniform series of charts and tables suitable for the use of designing engineers and for purposes of general reference. The absolute system of coefficients has been used, since it is thought by the National Advisory Committee for Aeronautics that this is the one most suited for international use and yet is one for which a desired transformation can be easily made" (p. 397).</p>Aerodynamic Characteristics of Airfoils 4: Continuation of Reports Nos. 93, 124, and 1822011-11-17T22:13:23-06:00https://digital.library.unt.edu/ark:/67531/metadc65896/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc65896/"><img alt="Aerodynamic Characteristics of Airfoils 4: Continuation of Reports Nos. 93, 124, and 182" title="Aerodynamic Characteristics of Airfoils 4: Continuation of Reports Nos. 93, 124, and 182" src="https://digital.library.unt.edu/ark:/67531/metadc65896/small/"/></a></p><p>This collection of data on airfoils has been made from the published reports of a number of the leading Aerodynamic Laboratories of this country and Europe. The information which was originally expressed according to the different customs of the several laboratories is here presented in a uniform series of charts and tables suitable for the use of designing engineers and for purposes of general reference. The authority for the results here presented is given as the name of the laboratory at which the experiments were conducted, with the size of the model, wind velocity, and year of test.</p>Aerodynamic Characteristics of Airfoils 5: Continuation of Reports Nos. 93, 124, 182, and 2442011-11-17T22:13:23-06:00https://digital.library.unt.edu/ark:/67531/metadc65940/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc65940/"><img alt="Aerodynamic Characteristics of Airfoils 5: Continuation of Reports Nos. 93, 124, 182, and 244" title="Aerodynamic Characteristics of Airfoils 5: Continuation of Reports Nos. 93, 124, 182, and 244" src="https://digital.library.unt.edu/ark:/67531/metadc65940/small/"/></a></p><p>"This collection of data on airfoils has been made from published reports of a number of the leading aerodynamic laboratories of this country and Europe. The information which was originally expressed according to the different customs of the several laboratories is here presented in a uniform series of charts and tables suitable for the use of designing engineers and for purposes of general reference. The authority for the results here presented is given as the name of the laboratory at which the experiments were conducted, with the size of the model, wind velocity, and year of tests" (p. 139).</p>Aerodynamic Characteristics of Airfoils 6: Continuation of Reports Nos. 93, 124, 182, 244, and 2862011-11-17T22:13:23-06:00https://digital.library.unt.edu/ark:/67531/metadc65970/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc65970/"><img alt="Aerodynamic Characteristics of Airfoils 6: Continuation of Reports Nos. 93, 124, 182, 244, and 286" title="Aerodynamic Characteristics of Airfoils 6: Continuation of Reports Nos. 93, 124, 182, 244, and 286" src="https://digital.library.unt.edu/ark:/67531/metadc65970/small/"/></a></p><p>"This collection of data on airfoils has been made from the published reports of a number of the leading aerodynamic laboratories of this country and Europe. The information which was originally expressed according to the different customs of the several laboratories is here presented in a uniform series of charts and tables suitable for use of designing engineers and for purposes of general reference. The authority for the results here presented is given as the name of the laboratory at which the experiments were conducted, with the size of the model, wind velocity, and year of test" (p. 213).</p>General Specifications Covering Requirements of Aeronautic Instruments2011-11-17T22:13:23-06:00https://digital.library.unt.edu/ark:/67531/metadc65626/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc65626/"><img alt="General Specifications Covering Requirements of Aeronautic Instruments" title="General Specifications Covering Requirements of Aeronautic Instruments" src="https://digital.library.unt.edu/ark:/67531/metadc65626/small/"/></a></p><p>Report includes specifications for the use and production of instruments used in the navigation and operation of aircraft. Specifications are included for the following instruments: barometer or altimeter, compass, air speed meter, inclinometer, drift meter, tachometer, oil gauge, oil pressure gauge, gasoline gauge, gasoline flow indicator, distance indicator, barograph, angle of attack indicator, radiator temperature indicator, gasoline feed system pressure indicator, sextant, airplane director.</p>Nomenclature for Aeronautics2014-03-30T18:00:15-05:00https://digital.library.unt.edu/ark:/67531/metadc279570/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc279570/"><img alt="Nomenclature for Aeronautics" title="Nomenclature for Aeronautics" src="https://digital.library.unt.edu/ark:/67531/metadc279570/small/"/></a></p><p>The nomenclature for aeronautics presented in this Report No. 474 is a revision of the last previous report on this subject (i.e., Report no. 240.) This report is published for the purpose of encouraging greater uniformity and precision in the use of terms relating to aeronautics, both in official documents of the Government and in commercial publications. Terms in general use in other branches of engineering have been included only where they have some special significance in aeronautics, or form an integral part of its terminology.</p>Nomenclature for Aeronautics2011-11-17T22:13:23-06:00https://digital.library.unt.edu/ark:/67531/metadc66122/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc66122/"><img alt="Nomenclature for Aeronautics" title="Nomenclature for Aeronautics" src="https://digital.library.unt.edu/ark:/67531/metadc66122/small/"/></a></p><p>"This nomenclature for aeronautics was prepared by a special conference on aeronautical nomenclature by the Executive Committee of the National Advisory Committee for Aeronautics at a meeting held August 11, 1933. This publication supersedes all previous publications of the committee on this subject. The purpose of the committee in the preparation and publication of this report is to secure uniformity in the official documents of the government and, as far as possible, in technical and other commercial publications" (p. 603).</p>Nomenclature for Aeronautics2011-11-17T22:13:23-06:00https://digital.library.unt.edu/ark:/67531/metadc65627/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc65627/"><img alt="Nomenclature for Aeronautics" title="Nomenclature for Aeronautics" src="https://digital.library.unt.edu/ark:/67531/metadc65627/small/"/></a></p><p>Report defines the principal terms which have come into use in the development of aeronautics.</p>Nomenclature for Aeronautics2011-11-17T22:13:23-06:00https://digital.library.unt.edu/ark:/67531/metadc65634/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc65634/"><img alt="Nomenclature for Aeronautics" title="Nomenclature for Aeronautics" src="https://digital.library.unt.edu/ark:/67531/metadc65634/small/"/></a></p><p>Report defines the principal terms which have come into use in the development of aeronautics.</p>Nomenclature for Aeronautics2011-11-17T22:13:23-06:00https://digital.library.unt.edu/ark:/67531/metadc65893/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc65893/"><img alt="Nomenclature for Aeronautics" title="Nomenclature for Aeronautics" src="https://digital.library.unt.edu/ark:/67531/metadc65893/small/"/></a></p><p>"This nomenclature for aeronautics was prepared by a Special Conference on Aeronautical Nomenclature by the executive committee of the National Advisory Committee for Aeronautics at a meeting held on August 19, 1924, at which meeting Dr. Joseph S. Ames was appointed chairman of the conference. The conference was composed of representatives of the National Advisory Committee for Aeronautics and specially appointed representatives officially designated by the Army Air Service, the Bureau of Aeronautics of the Navy Department, the Bureau of Standards, the American Society of Mechanical Engineers, the Society of Automotive Engineers, and the Aeronautical Chamber of Commerce. The purpose of the committee in the preparation and publication of this report is to secure uniformity in the official documents of the government and, as far as possible, in technical and other commercial publications" (p. 193).</p>Nomenclature for Aeronautics2011-11-17T22:13:23-06:00https://digital.library.unt.edu/ark:/67531/metadc65645/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc65645/"><img alt="Nomenclature for Aeronautics" title="Nomenclature for Aeronautics" src="https://digital.library.unt.edu/ark:/67531/metadc65645/small/"/></a></p><p>Report defines the principal terms which have come into use in the development of aeronautics. It was prepared in cooperation with a committee engaged upon a similar undertaking in Great Britain. As a result this nomenclature is in substantial agreement with the one which has been adopted by the aeronautical authorities of Great Britain.</p>Nomenclature for Aeronautics2011-11-17T22:13:23-06:00https://digital.library.unt.edu/ark:/67531/metadc65808/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc65808/"><img alt="Nomenclature for Aeronautics" title="Nomenclature for Aeronautics" src="https://digital.library.unt.edu/ark:/67531/metadc65808/small/"/></a></p><p>"This nomenclature for aeronautics was prepared by a special conference on aeronautical nomenclature, composed of representatives of the Army and Navy Air Services, the Air Mail Service, the Bureau of Standards, the National Advisory Committee for Aeronautics, and private life. This report supersedes all previous publications of the committee on this subject. It is published with the intention of securing greater uniformity and accuracy in official documents of the government, and, as far as possible, in technical and other commercial publications" (p. 619).</p>Standard Atmosphere - Tables and Data for Altitudes to 65,800 Feet2011-11-17T22:13:23-06:00https://digital.library.unt.edu/ark:/67531/metadc65571/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc65571/"><img alt="Standard Atmosphere - Tables and Data for Altitudes to 65,800 Feet" title="Standard Atmosphere - Tables and Data for Altitudes to 65,800 Feet" src="https://digital.library.unt.edu/ark:/67531/metadc65571/small/"/></a></p><p>Report includes calculated detailed tables of pressures and densities of a standard atmosphere in both metric and english units for altitudes from -5,000 meters to 20,000 meters and from -16,500 feet to 65,800 feet. Tables, figures, physical constants, and basic equations are based upon the text, reproduced herein, of the manual of the ICAO standard atmosphere, International Civil Aviation Organization (ICAO) draft of December 1952.</p>Thirty-Seventh Annual Report of the National Advisory Committee for Aeronautics: Administrative Report Including Technical Report Nos. 1003 to 10582011-11-17T17:13:32-06:00https://digital.library.unt.edu/ark:/67531/metadc64171/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc64171/"><img alt="Thirty-Seventh Annual Report of the National Advisory Committee for Aeronautics: Administrative Report Including Technical Report Nos. 1003 to 1058" title="Thirty-Seventh Annual Report of the National Advisory Committee for Aeronautics: Administrative Report Including Technical Report Nos. 1003 to 1058" src="https://digital.library.unt.edu/ark:/67531/metadc64171/small/"/></a></p><p>"In accordance with the act of Congress, approved March 3,1915 (U.S. C. title 50, sec. 151), which established the National Advisory Committee for Aeronautics the Committee submits its thirty-seventh annual report for the fiscal year 1951. The United States is engaged in expanding military aviation to levels never before reached except in the midst of a major war. In Korea, our military aircraft are engaged in combat with airplanes of an unfriendly nation evidently able to build military aircraft of increasing capabilities. In this environment, the NACA is responsible for conducting an adequate program of scientific research to open the way for the design of aircraft and missile of superior performance" (p. VII).</p>