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Technical Report Archive and Image Library
87
National Advisory Committee for Aeronautics Collection
60
Office of Scientific & Technical Information Technical Reports
30
Texas Attorney General Opinions
26
TRAIL Microcard Collection
16
Government Documents A to Z Digitization Project
4
Texas State Publications
1
USDA Farmers' Bulletins
1
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NACA Research Memorandums
29
NACA Technical Notes
26
Atomic Energy Commission Reports
15
United States Bureau of Mines Reports
4
HW (Series)
3
Hanford Works Reports
3
NACA Technical Reports
3
ORNL (Series)
3
Oak Ridge National Laboratory Reports
3
Report of investigations (United States. Bureau of Mines)
3
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Control of the Garden Webworm in Alfalfa.
Describes the characteristics of the garden webworm, the damage it causes to alfalfa crops, and methods of control.
Date:
July 1951
Creator:
Poos, F. W.
Object Type:
Book
System:
The UNT Digital Library
How to choose and use oranges.
A brief guide to selecting and serving oranges and orange juice.
Date:
July 1951
Creator:
United States. Extension Service.
Object Type:
Book
System:
The UNT Digital Library
How to choose and use Apples.
Describes how to select an apple, what it is used for, and the proper way to store it.
Date:
July 1951
Creator:
United States. Extension Service.
Object Type:
Pamphlet
System:
The UNT Digital Library
Cutting for profit in Southern pine woodlands.
A guide to managing farm woodlands as a source of income, with a focus on loblolly and shortleaf pine and hardwoods.
Date:
July 1951
Creator:
Bond, W. E. (Walter Edwin), 1891-
Object Type:
Book
System:
The UNT Digital Library
A Simplified Instrument for Recording and Indicating Frequency and Intensity of Icing Conditions Encountered in Flight
Memorandum presenting an instrument for recording and indicating the frequency and intensity of aircraft icing conditions to obtain statistical icing data over worldwide air routes during routine airline operations. Data of this type is needed to provide pertinent meteorological information necessary for the optimum design of ice-protection systems. The features that make this particular instrument desirable include the simplicity of operation, freedom from maintenance and operating problems, automatic operation upon encountering an icing condition, visual indications of icing intensity available to the pilot, total weight of 18 pounds, and continuous recorded data.
Date:
July 3, 1951
Creator:
Perkins, Porter J.; McCullough, Stuart & Lewis, Ralph D.
Object Type:
Report
System:
The UNT Digital Library
Analysis of Meteorological Data Obtained During Flight in a Supercooled Stratiform Cloud of High Liquid-Water Content
"Flight icing-rate data obtained in a dense and abnormally deep supercooled stratiform cloud system indicated the existence of liquid-water contents generally exceeding values in amount and extent previously reported over the midwestern sections of the United States. Additional information obtained during descent through a part of the cloud system indicated liquid-water contents that significantly exceeded theoretical values, especially near the middle of the cloud layer. The growth of cloud droplets to sizes that resulted in sedimentation from the upper portions of the cloud is considered to be a possible cause of the high water contents near the center of the cloud layer" (p. 1).
Date:
July 11, 1951
Creator:
Perkins, Porter J. & Kline, Dwight B.
Object Type:
Report
System:
The UNT Digital Library
Study of Chromium-Frit-Type Coatings for High-Temperature Protection of Molybdenum
"The achievement of more compact and efficient power plants for aircraft is dependent, among other factors, on the perfection of heat-resisting materials that are superior to those in current use. Molybdenum is one of the high-melting metals (melting point, 4750 F). It is fairly abundant and also can be worked into many of the shapes required in modern power plants. To permit its widespread use at elevated temperatures, however, some means must first be found to prevent its rapid oxidation" (p. 1).
Date:
July 1951
Creator:
Moore, D. G.; Bolz, L. H.; Pitts, J. W. & Harrison, W. N.
Object Type:
Report
System:
The UNT Digital Library
A rapid approximate method for determining velocity distribution on impeller blades of centrifugal compressors
Report presenting the development of a rapid approximate method of analysis for both compressible and incompressible, nonviscous flow through radial- or mixed-flow centrifugal compressors with arbitrary hub and shroud contours and arbitrary blade shape. The method is used with eight numerical examples for two-dimensional flow, covering a wide range of flow rate, impeller-tip speed, number of blades, and blade curvature.
Date:
July 1951
Creator:
Stanitz, John D. & Prian, Vasily D.
Object Type:
Report
System:
The UNT Digital Library
Theoretical aerodynamic characteristics of bodies in a free-molecule-flow field
Report presenting an investigation of the aerodynamic coefficients of various bodies located in a free-molecule-flow field. The bodies include a flat plate, a cylinder, a sphere, and a cone.
Date:
July 1951
Creator:
Stalder, Jackson R. & Zurick, Vernon J.
Object Type:
Report
System:
The UNT Digital Library
Flight investigation of the effect of transient wing response on wing strains of a twin-engine transport airplane in rough air
Report presenting a flight investigation on a twin-engine transport airplane to determine the strains associated with the dynamic behavior of the wing during flights through rough air. Flights were made in clear-air turbulence for different wing fuel loads and for two speed conditions at a range of altitudes. Results indicated that the bending strains per unit normal acceleration in gusts were approximately 20 percent higher than those in slow pull-ups for all measuring positions and flight conditions of the tests.
Date:
July 1951
Creator:
Mickleboro, Harry C. & Shufflebarger, Charles C.
Object Type:
Report
System:
The UNT Digital Library
Bench-Test Investigation of the Transient-Response Characteristics of Several Simulated Airplanes Incorporating an Autopilot Sensitive to Yawing Accelerations
Note presenting testing of an autopilot sensitive to yawing acceleration, which was used to control four simulated airplane (mass-spring) configurations, and a series of bench tests to determine the response characteristics of the combinations.
Date:
July 1951
Creator:
Howard, Donald A.
Object Type:
Report
System:
The UNT Digital Library
Temperature distribution in internally heated walls of heat exchangers with noncircular flow passages using coolants with very low Prandtl number
Report presenting a prediction of the magnitude of temperature variation in order to detect the places of highest temperature and to determine the operating temperatures admissible for the material of which the heat exchanger is composed. Results regarding the temperature distribution in triangular passages, temperature distribution in rectangular passages, influence of velocity field on temperature field, and a comparison of Prandtl number 1 solution are provided.
Date:
July 1951
Creator:
Eckert, E. R. G. & Low, George M.
Object Type:
Report
System:
The UNT Digital Library
Investigation of NACA 64,2-432 and 64,3-440 airfoil sections with boundary-layer control and an analytical study of their possible applications
Report presenting testing of NACA 64-series airfoil sections to determine the effect of boundary-layer control by means of suction through an airfoil chord on the pressure distribution, lift, and drag characteristics of two different types of airfoil sections. Substantial reductions in wake drag were obtained through a wide range of lift coefficients with relatively moderate flow coefficients and pressure-loss coefficients. Results regarding airfoil-section data and effect of boundary-layer control on lift-drag ratio are provided.
Date:
July 1951
Creator:
Horton, Elmer A.; Racisz, Stanley Frank & Paradiso, Nicholas J.
Object Type:
Report
System:
The UNT Digital Library
Method of Analysis for Compressible Flow Arbitrary Turbomachine Blades on General Surface of Revolution
Note presenting a method of obtaining the flow of a nonviscous compressible fluid past arbitrary compressor or turbine blades between two neighboring surfaces of revolution. Satisfactory results were obtained by the method described in the investigation of the detailed flow variation of a compressible fluid past typical high-solidity, highly cambered thick turbine blades on a cylindrical surface.
Date:
July 1951
Creator:
Wu, Chung-Hua & Brown, Curtis A.
Object Type:
Report
System:
The UNT Digital Library
Approximate design method for high-solidity blade elements in compressors and turbines
Note presenting an approximate blade-element design method for compressible or incompressible nonviscous flow in high-solidity stators or rotors of axial-, radial-, or mixed-flow compressors, turbines, or two-dimensional cascades. The method is based upon channel-type flow between blade elements on a specified surface of revolution that lies between the hub and shroud and is concentric with the axis of the compressor turbine.
Date:
July 1951
Creator:
Stanitz, John D.
Object Type:
Report
System:
The UNT Digital Library
Construction and Use of Charts in Design Studies of Gas Turbines
"A method is presented for the computation and graphic representation of a series of possible turbine designs for any specific application. The use of a preliminary design chart is suggested for determining the number of stages and the effects of exit whirl and annular-area divergence on possible configurations. A specific design chart can then be made to aid in the study of the relations between turbine radius ratio, diameter, and significant design parameters such as Mach numbers, turning angles, and blade root stresses" (p. 1).
Date:
July 1951
Creator:
Alpert, Sumner & Litrenta, Rose M.
Object Type:
Report
System:
The UNT Digital Library
The Indicial Lift and Pitching Moment for a Sinking or Pitching Two-Dimensional Wing Flying at Subsonic or Supersonic Speeds
Report presenting solutions for the lift and pitching moment on a two-dimensional flat plate undergoing a step variation in pitch or vertical displacement. The results are subject to the restrictions of linearized, compressible-flow theory.
Date:
July 1951
Creator:
Lomax, Harvard; Heaslet, Max A. & Sluder, Loma
Object Type:
Report
System:
The UNT Digital Library
Axial-Momentum Theory for Propellers in Compressible Flow
Note presenting the development of the axial-momentum theory for compressible flow as a step in the formulation of a rational propeller theory for compressible flow. The simple theory neglects some properties but predicts flow conditions through a propeller that are significantly different from the conditions predicted by the incompressible-flow theory.
Date:
July 1951
Creator:
Vogeley, Arthur William
Object Type:
Report
System:
The UNT Digital Library
Method of determining initial tangents of contours of flow variables behind a curved, axially symmetric shock wave
Report presenting a method for calculating the initial tangents of contours of constant destiny, pressure, and Mach number behind a curved, axially symmetric shock wave has been desired. Initial tangents of density contours are obtained that fair well into contours determined from interferograms for the flow about a sphere at Mach number 1.62. the flow field obtianed from the shock wave by the method of characteristics is compared with that obtained by interferometry.
Date:
July 1951
Creator:
Wood, George P. & Gooderum, Paul B.
Object Type:
Report
System:
The UNT Digital Library
An Experimental Determination of the Critical Bending Moment of a Box Beam Stiffened by Posts
"An experimental determination of the critical bending moment of a box beam stiffened by posts is described and discussed. The experimental buckling load is in good agreement with that given by theory. Since appreciable distortion of the beam cross section occurred before the buckling load was reached, modification of post construction by the use of several ribs may be necessary for maintenance of the rectangular shape of the cross section" (p. 1).
Date:
July 1951
Creator:
Barrett, Paul F. & Seide, Paul
Object Type:
Report
System:
The UNT Digital Library
Experimental study of an angle-of-attack vane mounted ahead of the nose of an airplane for use as a sensing device for an acceleration alleviator
Report presenting an investigation to determine the ability of a vane mounted ahead of the nose of an airplane to give an indication of the average angle of attack over the entire wing span during flight through rough air. The main purpose was to determine the suitability of such a vane as a sensing device for an acceleration alleviator. The vane gives a sufficiently accurate measure of average angle of attack over the wing span to be used that way, but rapid fluctuations in angle of attack caused by turbulence would have to be filtered from the output.
Date:
July 1951
Creator:
Kraft, Christopher C., Jr. & Assadourian, Arthur
Object Type:
Report
System:
The UNT Digital Library
Flow Separation Ahead of Blunt Bodies at Supersonic Speeds
Note presenting a discussion of supersonic flow against blunt bodies placed in boundary layers or wakes, which concludes that wedge-shaped or conical dead-air regions should form ahead of the body if part of the upstream velocity profile is subsonic and if the body is fairly thick relative to the initial boundary layer or wake thickness. For the intermediate range of body thicknesses, an analysis of the two-dimensional flow against blunt bodies mounted on a flat plate agreed quantitatively with experimental results in a range of Mach numbers.
Date:
July 1951
Creator:
Moeckel, W. E.
Object Type:
Report
System:
The UNT Digital Library
Effects of Design Details on the Fatigue Strength of 355-T6 Sand-Cast Aluminum Alloy
Note presenting static and fatigue tests made on 355-T6 sand-cast plate-type aluminum-alloy specimens incorporating holes, bosses, and ribs. In the static tests, the tensile strength of the plain plate-type specimen agreed within 3 percent with the strength of separately cast test bars. Of the design details studied, the unreinforced hole was the most effective stress-raiser for fatigue lives from 10,000 to 25,000,000 cycles.
Date:
July 1951
Creator:
Holt, M. & Eaton, I. D.
Object Type:
Report
System:
The UNT Digital Library
Apparatus for obtaining a supersonic flow of very short duration and some drag measurements obtained with its use
From Introduction: "The auxiliary apparatus described in this paper was constructed to meet this need and has been developed to a point where satisfactory measurements of relative drag can be obtained. In this paper, the apparatus is described and some comparisons are made between the results obtained with this apparatus and the measurements of free-fall, rocket, and supersonic-tunnel techniques."
Date:
July 23, 1951
Creator:
Yeates, John E., Jr.; Bailey, F. J., Jr. & Voglewede, T. J.
Object Type:
Report
System:
The UNT Digital Library