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Accelerations in Transport-Airplane Crashes

Description: From Introduction: "A study of crash-impact survival in light airplanes is reported in references 1 and 2. A similar study for fighter airplanes is reported in reference 3. This report discusses crash-impact survival in transport airplanes."
Date: February 1958
Creator: Preston, G. Merritt & Pesman, Gerard J.
Partner: UNT Libraries Government Documents Department
open access

Aerodynamic Effects Caused by Icing of an Unswept NACA 65A004 Airfoil

Description: From Summary: "The effects of ice formations on the section lift, drag, and pitching-moment coefficients of an unswept NACA 65A004 airfoil section of 6-foot chord were studied.. The magnitude of the aerodynamic penalties was primarily a function of the shape and size of the ice formation near the leading edge of the airfoil. The exact size and shape of the ice formations were determined photographically and found to be complex functions of the operating and icing conditions."
Date: February 1958
Creator: Gray, Vernon H. & von Glahn, Uwe H.
Partner: UNT Libraries Government Documents Department
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An analysis of the turbulent boundary-layer characteristics on a flat plate with distributed light-gas injection

Description: From Introduction: "The present paper is concerned with a transpiration cooling system in which the coolant passes through the surface it is protecting before entering the surrounding boundary layer. Analyses and experiments have been performed to determine the effect of distributed air transportation through flat surfaces over which air flows in turbulent boundary layer (refs. 2, 3, and 4)."
Date: February 1958
Creator: Rubesin, Morris W. & Pappas, Constantine C.
Partner: UNT Libraries Government Documents Department
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Analysis of yttrium oxide exchange samples

Description: Report detailing the results of several yttrium oxide analyses. Four different institutions were given 50 grams of yttrium oxide to analyze following the Yttrium Analytical Conference on November 7th and 8th, 1956. This report details the results of those four different institutions.
Date: February 1958
Creator: Rodden, Clement J.
Partner: UNT Libraries Government Documents Department
open access

Application of a First-Production Evaluation System to Help Assure Material Compatibility and Functional Reliance

Description: The ultimate achievement of a research and development program at Sandia. Corporation, as at any other AFX or DOD project, is the physical design of a component or weapon system of high reliability. The design accomplishment is initially established when the basic drawings and specifications are released for production. These drawings and specifications are often based on engineering evaluations of bread- .board and early so-called & quot;gold plated prototypes. However, the design accomplishme… more
Date: February 1, 1958
Creator: Ballard, Douglas
Partner: UNT Libraries Government Documents Department
open access

Boundary-layer transition on an open-nose cone at Mach 3.1

Description: Report presenting comparison of transition locations for an open-nose cone, a conventional sharp cone, and a hollow cylinder showed that transition locations on the open-nose cone and hollow cylinder were identical but differed from the sharp cone. Bluntness effects on the open-nose cone were quite similar to those observed on the hollow cylinder.
Date: February 1958
Creator: Brinich, Paul F.
Partner: UNT Libraries Government Documents Department
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Charts Relating the Compressive and Shear Buckling Stresses of Longitudinally Supported Plates to the Effective Deflectional Stiffness

Description: "A stability analysis is made of long flat rectangular plates subjected to both shear and compressive loads. The edges of the plates are taken to be simply supported and the plates are supported along one or two intermediate longitudinal lines by lines of deflectional springs (elastic line supports). The results of the analysis are presented in the form of charts that are useful in the determination of the buckling load of plates stiffened by stringers or webs" (p. 1).
Date: February 1958
Creator: Johnson, Aldie E., Jr.
Partner: UNT Libraries Government Documents Department
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Comparison of hydrodynamic-impact acceleration and response for systems with single and with multiple elastic modes

Description: Report presenting hydrodynamic impact testing made with a multimode elastic model consisting of a rigid prismatic float and a flexible wing and a comparison with similar experimental results for a single-mode system and with theoretical solutions. Testing was conducted in smooth water at two fixed trims and two flight-path angles over a range of velocities. Results regarding accelerations, time histories, oscillatory accelerations, elastic-body acceleration data, and rigid-body acceleration dat… more
Date: February 1958
Creator: Miller, Robert W.
Partner: UNT Libraries Government Documents Department
open access

Compilation of information on the transonic attachment of flows at the leading edges of airfoils

Description: Schlieren photographs have been compiled of the two-dimensional flow at transonic speeds past 37 airfoils. These airfoils have variously shaped profiles, and some are related in thickness and camber. The data for these airfoils were analyzed to provide basic information on the flow changes involved and to determine factors affecting transonic-flow attachment, which is a transition from separated to unseparated flow at the leading edges of two-dimensional airfoils at fixed angles as the subsonic… more
Date: February 1958
Creator: Lindsey, Walter F. & Landrum, Emma Jean
Partner: UNT Libraries Government Documents Department
open access

Correlations Among Ice Measurements, Impingement Rates Icing Conditions, and Drag Coefficients for Unswept NACA 65A004 Airfoil

Description: "An empirical relation has been obtained by which the change in drag coefficient caused by ice formations on an unswept NACA 65A004 airfoil section can be determined from the following icing and operating conditions: icing time, airspeed, air total temperature, liquid-water content, cloud droplet impingement efficiencies, airfoil chord length, and angles of attack. The correlation was obtained by use of measured ice heights and ice angles. These measurements were obtained from a variety of ice … more
Date: February 1958
Creator: Gray, Vernon H.
Partner: UNT Libraries Government Documents Department
open access

Creep of Aluminum-Copper Alloys During Age Hardening

Description: Note presenting a study of the interrelation of aging during creep and of creep during aging in polycrystalline aluminum alloys containing 1 to 4 percent copper. Experimental procedures included interrupted creep tests, tensile tests of crept specimens, quantitative metallographic determination of the percent precipitation during creep, hardness measurements on unstressed and stressed aged alloys, X-ray studies of deformation in the crystalline lattice, and microscopic examination of the surfac… more
Date: February 1958
Creator: Underwood, E. E.; Marsh, L. L. & Manning, G. K.
Partner: UNT Libraries Government Documents Department
open access

Drag Minimization for Wings in Supersonic Flow, With Various Constraints

Description: Report presenting a study of the minimization of inviscid fluid drag for thin aerodynamic shapes subject to imposed constraints on lift, pitching moment, base area, or volume. The problem is transformed to one or determining a two-dimensional potential flow satisfying either Laplace's or Poisson's equations with boundary values fixed by the imposed conditions.
Date: February 1958
Creator: Heaslet, Max A. & Fuller, Franklyn B.
Partner: UNT Libraries Government Documents Department
open access

Effect of fiber orientation in races and balls under rolling-contact fatigue conditions

Description: Report presenting a study of the effect of fiber orientation on fatigue life for both races and balls in the fatigue spin rig. In both balls and races, a concentration of fatigue failures was observed in that portion of the specimens with the highest angle of intersection of fiber flow lines from the surface.
Date: February 1958
Creator: Carter, Thomas L.
Partner: UNT Libraries Government Documents Department
open access

Effect of lubricant base stock on rolling-contact fatigue life

Description: Report presenting five lubricants of different base stock tested using groups of 1/2-inch air-melt AISI M-1 tool-steel balls under rolling-contact fatigue conditions in the fatigue spin rig. A methyl silicone, mineral oil, glycol, sebacate, and adipate were used. All other test conditions were held constant at a test temperature of 100 degrees Fahrenheit and a maximum theoretical Hertz stress of 725,000 pounds per square inch in compression.
Date: February 1958
Creator: Carter, Thomas L.
Partner: UNT Libraries Government Documents Department
open access

Effectiveness of boundary-layer control, obtained by blowing over a plain rear flap in combination with a forward slotted flap, in deflecting a slipstream downward for vertical take-off

Description: The wing employed in this investigation had a 67-percent-chord slotted flap in combination with a 33-percent-chord plain rear flap equipped with a full-span blowing nozzle. The tests were conducted in a static-thrust facility at the Langley Aeronautical Laboratory. The investigation indicated that the plain rear flap alone with a low momentum coefficient for boundary-layer control provided larger turning angles than the combined slotted and plain flaps without boundary-layer control.
Date: February 1958
Creator: Spreemann, Kenneth P.
Partner: UNT Libraries Government Documents Department
open access

Evaporation, Heat Transfer, and Velocity Distribution in Two-Dimensional and Rotationally Symmetrical Laminar Boundary-Layer Flow

Description: The fundamental boundary layer equations for the flow, temperature and concentration fields are presented. Two dimensional symmetrical and unsymmetrical and rotationally symmetrical steady boundary layer flows are treated as well as the transfer boundary layer. Approximation methods for the calculation of the transfer layer are discussed and a brief survey of an investigation into the validity of the law that the Nusselt number is proportional to the cube root of the Prandtl number is presente… more
Date: February 1958
Creator: Frössling, Nils
Partner: UNT Libraries Government Documents Department
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Experimental Thermal Conductivities of the N2D4 Is in Equilibrium to 2NO2 System

Description: Report presenting an investigation of direct measurements of the thermal conductivity of reacting gas systems. The hot-wire measurement technique was used at a range of temperatures and pressures. A comparison of the theoretical and experimental results are provided.
Date: February 1958
Creator: Coffin, Kenneth P. & O'Neal, Cleveland, Jr.
Partner: UNT Libraries Government Documents Department
open access

The Fabrication of a Plutonium Helix for a Doppler Experiment. Work Completed: September 1956

Description: A helix constructed of plutonium was made to test the Doppler temperature effect in ZPR-III. The helix. 1 in. in diameter and 6 1/4 in. long. contained 240 g of deltaphase plutonium alloy encapsulated in titanium tubing. rour piutonium rods were extruded, joined together, and pushed into a titanium tube. This tube was swaged tightly over the piutonium rod. and the assembly was wound into a coil. Electrical leads to the coil were made by swaging copper tubing over the ends of the coil. The helix… more
Date: February 1, 1958
Creator: Dunworth, R. J.; Rhude, H. V. & Kelman, L. R.
Partner: UNT Libraries Government Documents Department
open access

Flight Investigation of Effects of Atmospheric Turbulence and Moderate Maneuvers on Bending and Torsional Moments Encountered by a Helicopter Rotor Blade

Description: Note presenting flight tests conducted with a medium-size single-rotor helicopter, of which one blade was equipped with strain gages, to determine the relative effects of atmospheric turbulence and moderate maneuvers on the periodic rotor blade moments. The results indicate no significant increase in the total blade moments due to atmospheric turbulence of moderate pull-up maneuvers which produced center-of-gravity acceleration increments of less than about 0.15g. Results regarding moment recor… more
Date: February 1958
Creator: Ludi, LeRoy H.
Partner: UNT Libraries Government Documents Department
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Friction Studies of Various Materials in Liquid Nitrogen

Description: Note presenting friction, wear, and surface-failure properties of various materials as determined in liquid nitrogen. Data were obtained at a sliding velocity of 2300 feet per minute and a load of 1000 grams with a hemisphere sliding on the flat surface of a rotating disk. Results regarding metals and metal compounds, nonmetals, and some miscellaneous observations are provided.
Date: February 1958
Creator: Wisander, D. W.; Hady, W. F. & Johnson, R. L.
Partner: UNT Libraries Government Documents Department
open access

HRE-3 PRESSURIZER DESIGN

Description: A conceptual design is presented for the HRE-3 core and blanket pressurization systems. In general, the systems are similar to the preliminary designs previously described. Flowsheets, conceptual sketches, and specification = for the major components are included. Estimation oi the D/sub 2/ concentration in the blanket is treated in detail. The design appears to be safe with regards to the d/sub 2/ explosion hazard. (auth)
Date: February 1, 1958
Creator: Bolger, J.C. & Maak, R.O.
Partner: UNT Libraries Government Documents Department
open access

Hydraulic Cyclones for Thorium Oxide Particle Size Classification

Description: Results are reported concerning studies of hydraulic cyclones (hydroclones) for application to particle size classification of ThO/sub 2/. Tests were run with a 0.50-in. diam. hydroclone. It was shown that a single pass through this hydroclone would reduce the material greater than 10 mu from 12 wt.% to less than 1% while the mean diameter was reduced from 1.7 to 0.9 mu . When the overflow (fine) fraction was again pumped through the hydroclone, the overflow solids from the second pass were 98 … more
Date: February 1, 1958
Creator: Bennett, L. L. & Thomas, D. G.
Partner: UNT Libraries Government Documents Department
open access

Impact on a Compressible Fluid

Description: "Upon impact of a solid body on the plane surface of a fluid, there occurs on the vetted surface of the body an abrupt pressure rise which propagates into both media with the speed of sound. Below, we assume the case where the speed of propagation of sound in the body which falls on the surface of the fluid may be regarded as infinitely large in comparison with the speed of propagation of sound in the fluid; that is, we shall assume that the falling body is absolutely rigid. IN this case, the e… more
Date: February 1958
Creator: Egorov, I. T.
Partner: UNT Libraries Government Documents Department
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