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A Summary of Meteorological Conditions Associated With Aircraft Icing and a Proposed Method of Selecting Design Criterions for Ice-Protection Equipment

Description: Note presenting data from various sources on the observed values of meteorological variables, liquid-water content, mean-effective droplet size, and temperature, which are pertinent to aircraft icing. A method is proposed for the selection of design criterions for ice-protection equipment. The data are divided into two broad cloud types, stratiform and cumuliform clouds, because the icing conditions are very different for the two types.
Date: November 1951
Creator: Hacker, Paul T. & Dorsch, Robert G.
Partner: UNT Libraries Government Documents Department
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Analysis of the Liquid-Metal Turbojet Cycle for Propulsion of Nuclear Powered Aircraft

Description: From Introduction: "The present report gives an analysis of the design point performance of nuclear powered liquid-metal turbojet engines. The effect of varying the assumptions necessary to calculate gross weight and reactor heat release from engine data is presented."
Date: November 19, 1951
Creator: Wachtl, W. W. & Rom, F. E.
Partner: UNT Libraries Government Documents Department
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Analysis of the Liquid-metal Turbojet Cycle for Propulsion of Nuclear Powered Aircraft

Description: Report presenting an analysis of the nuclear powered liquid-metal turbojet cycle for a wide range of engine operating conditions at a range of flight Mach numbers and altitudes. The method of analysis and working charts are presented to facilitate investigations beyond the scope of this report.
Date: November 19, 1951
Creator: Rom, F. E. & Wachtl, W. W.
Partner: UNT Libraries Government Documents Department
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Effect of taper ratio on the low-speed rolling stability derivatives of swept and unswept wings of aspect ratio 2.61

Description: Results of tests conducted in the 6-foot-diameter rolling-flow test section of the Langley stability tunnel to determine the effects of varying taper ratio on the rolling and static stability characteristics of a swept wing are presented; results are also given for the effects of varying taper ratio on an unswept wing and for the effects of sweep on a tapered wing. All the models were of aspect ratio 2.61 and had NACA 0012 sections normal to the quarter-chord line. Taper ratios of 1.00, 0.50, a… more
Date: November 1951
Creator: Brewer, Jack D. & Fisher, Lewis R.
Partner: UNT Libraries Government Documents Department
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Rotogenerative Detection of Corrosion Currents

Description: Note presenting a new technique for studying corrosion phenomena. The method permits the detection of the presence of currents produced by local cells on the surface of a corroding metal specimen. The method can be applied to the study of stress corrosion; in this case a hollow specimen if subjected to sufficient hydraulic pressure to produce the desired stress level.
Date: November 1951
Creator: McAndrew, Joseph B.; Colner, William H. & Francis, Howard T.
Partner: UNT Libraries Government Documents Department
open access

An investigation of aircraft heaters 38: determination of thermal performance of rectangular- and trapezoidal-shaped inner-skin passages for anti-icing systems

Description: Report presenting the results of an experimental determination of the thermal and hydrodynamic behavior of air in the downstream portion of two types of double-skin passages used in heated-air leading-edge anti-icing systems. Results regarding heat transfer and pressure drop are provided.
Date: November 1951
Creator: Boelter, L. M. K.; Sanders, V. D. & Romie, F. E.
Partner: UNT Libraries Government Documents Department
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The Hydrodynamic Lubrication of Cyclically Loaded Bearings

Description: Note presenting an investigation of the hydrodynamic lubrication of cyclically loaded bearings in order to check the validity of the analytical studies of loading and lubrication studies.
Date: November 1951
Creator: Dayton, R. W. & Simons, E. M.
Partner: UNT Libraries Government Documents Department
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Flexural Fatigue Strengths of Riveted Box Beams - Alclad 14S-T6, Alclad 75S-T6, and Various Tempers of Alclad 24S

Description: Note presenting flexural fatigue tests made on riveted box beams of 14S-T6, 75S-T6, and various tempers of 24S alclad aluminum-alloy sheet in order to gain new knowledge of the fatigue strength of built-up structures. Of the five alloy-temper combinations studied in riveted box-beam sections, the flexural fatigue strengths were found to lie in a rather narrow band and no one combination was found to have higher strength values than all others for the entire range of fatigue life covered in thes… more
Date: November 1951
Creator: Eaton, I. D. & Holt, Marshall
Partner: UNT Libraries Government Documents Department
open access

Discrepancies Between Theoretical and Observed Behavior of Cyclically Loaded Bearings

Description: Note presenting an analysis of discrepancies between theory and the experimental behavior of a cyclically loaded shaft rotating in a sleeve bearing. For constant loads rotating at one-half the frequency of shaft rotation, eccentricity ratios were found to be unity when kerosene was used to lubricate the test bearing.
Date: November 1951
Creator: Dayton, R. W.; Simons, E. M. & Fend, F. A.
Partner: UNT Libraries Government Documents Department
open access

Viscosities of Air and Nitrogen at Low Pressures

Description: Note presenting information from the results of an investigation to measure the true viscosities of nitrogen and air at a range of pressures and temperatures. Results regarding the region of slip and region of free-molecule viscosity are provided.
Date: November 1951
Creator: Johnston, Herrick L.; Mattox, Robert W. & Powers, Robert W.
Partner: UNT Libraries Government Documents Department
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An Investigation by the Hodograph Method of Flow Through a Symmetrical Nozzle With Locally Supersonic Regions

Description: Note presenting a study of the flow of a compressible fluid through a channel with locally supersonic regions by using the Tricomi equation in the hodograph variables as an approximation in the sonic region to the equation of flow of an irrotational, inviscid gas. It is shown that this is equivalent to studying the flow of a gas with a pressure-density relation matching the isentropic relation to the third derivative at the sonic point. As specific examples, flows are computed with Mach number … more
Date: November 1951
Creator: Ehlers, F. Edward & Cohen, Hirsh G.
Partner: UNT Libraries Government Documents Department
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A Graphical Method for Plotting Amplitude and Phase Angle of Transfer Functions of Dynamic Systems Without Factoring Polynomials

Description: "A method is presented for obtaining amplitude and single plots for rational algebraic functions of an imaginary variable. Application of the method is illustrated by an example in which the frequency response of an automatically controlled aircraft is plotted. The method involves the use of templets but does not require the factoring of polynomials" (p. 1).
Date: November 1951
Creator: Smith, Earl F.
Partner: UNT Libraries Government Documents Department
open access

Theoretical aerodynamic characteristics of a family of slender wing-tail-body combinations

Description: The aerodynamic characteristics of an airplane configuration composed of a swept-back, nearly constant chord wing and a triangular tail mounted on a cylindrical body are presented. The analysis is based on the assumption that the free-stream Mach number is near unity or that the configuration is slender. The calculations for the tail are made on the assumption that the vortex system trailing back from the wing is either a sheet lying entirely in the plane of the flat tail surface or has complet… more
Date: November 1951
Creator: Lomax, Harvard & Byrd, Paul F.
Partner: UNT Libraries Government Documents Department
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Infrared Spectra of 59 Dicyclic Hydrocarbons

Description: "The infrared spectra are presented for 59 dicyclic hydrocarbons consisting of some diphenylalkanes, dicyclohexyalkanes, alkylbiphenyls and alkylbicyclohexyls ranging from C(sub 12) through C(sub 18). The physical properties of these compounds, which were available in a high state of purity, are tabulated for reference purposes" (p. 1).
Date: November 1951
Creator: Serijan, K. T.; Goodman, I. A. & Yankauskas, W. J.
Partner: UNT Libraries Government Documents Department
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Theoretical and Experimental Investigation of Condensation of Air in Hypersonic Wind Tunnels

Description: Note presenting a theoretical and experimental investigation of the condensation of air in hypersonic wind tunnels. The condensation was detected and measured by condensation-fog light scattering, static-pressure measurements, and changes in wedge shock angles at degrees of supersaturation lower than those predicted by existing condensation theory.
Date: November 1951
Creator: Stever, H. Guyford & Rathbun, Kenneth C.
Partner: UNT Libraries Government Documents Department
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A Survey of Creep in Metals

Description: "This report summarizes numerous theories relating to creep phenomena and the extent of current knowledge on the subject. Various possible mechanisms by which creep occurs both in single crystals and in polycrystals are described. An extensive bibliography of published works in this field is also included" (p. 1).
Date: November 1951
Creator: Schwope, A. D. & Jackson, L. R.
Partner: UNT Libraries Government Documents Department
open access

On the Spectrum of Isotropic Turbulence

Description: Note presenting measurements of the spectrum and correlation functions at large Reynolds number as well as a series of accurate spectrum measurements at lower Reynolds number. Results regarding decay, spectrum and correlation measurements in the GALCIT 10-foot tunnel, spectrum measurements in the 20-inch tunnel, moments of the spectrum, behavior of the spectrum at high frequencies, the spectrum at very large distances from the grid, and the spectrum of derivative are provided.
Date: November 1951
Creator: Liepmann, H. W.; Laufer, J. & Liepmann, Kate
Partner: UNT Libraries Government Documents Department
open access

A velocity-correction formula for the calculation of transonic Mach number distributions over diamond-shaped airfoils

Description: Report presenting a velocity-correction formula for the purpose of calculating, from the known Mach number distribution for a diamond-shaped airfoil at a stream Mach number of 1.0, Mach number distributions on the same airfoil at speeds from a Mach number of about 0.8 to shock-attachment Mach number. An expression for the rate of change of local Mach number with stream Mach number is derived and an explicit equation for the drag coefficient as a function of stream Mach number and thickness rat… more
Date: November 1951
Creator: Ivey, H. Reese & Harder, Keith C.
Partner: UNT Libraries Government Documents Department
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Heat Capacity Lag in Gases

Description: Note presenting a review of the literature on the sonic studies of the problem of the excitation of molecular vibrations by collision. The theory on which the interpretation of almost all the sonic work has been based is discussed rather qualitatively in some detail. Results concerning techniques, principal experimental programs, and an interpretation of the results are provided.
Date: November 1951
Creator: Walker, Richard
Partner: UNT Libraries Government Documents Department
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Studies on Von Kármán's Similarity Theory and Its Extension to Compressible Flows: A Critical Examination of Similarity Theory for Incompressible Flows

Description: Note presenting an investigation of three theories: the momentum transfer theory of Prandtl, the vorticity transfer theory of Taylor, and the similarity theory of Von Kármán. The primary focus is to examine Von Kármán's theory using modern concepts.
Date: November 1951
Creator: Lin, C. C. & Shen, S. F.
Partner: UNT Libraries Government Documents Department
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Studies of Von Kármán's Similarity Theory and Its Extension to Compressible Flows: A Similarity Theory for Turbulent Boundary Layer Over a Flat Plate in Compressible Flow

Description: Note presenting a treatment of the problem of turbulent boundary layer over a flat plate in compressible flow. The dissipation term in the energy equation, often neglected, is first carefully studied and found to be of importance. The four main approximations include the turbulence pattern, the boundary-layer growth, the two choices of the length scale, and the effect of pressure gradient.
Date: November 1951
Creator: Lin, C. C. & Shen, S. F.
Partner: UNT Libraries Government Documents Department
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Studies of Von Kármán's Similarity Theory and Its Extension to Compressible Flow: Investigation of Turbulent Boundary Layer Over a Flat Plate in Compressible Flow by the Similarity Theory

Description: Note presenting an investigation of the turbulent-boundary-layer flow over a flat plate in compressible flow. The report shows how the influence of the Mach number can be predicted from the theory after the constant coefficients in the theory are determined by one set of experimental measurements. By averaging the Navier-Stokes equations, differential equations for the mean flow are obtained.
Date: November 1951
Creator: Shen, S. F.
Partner: UNT Libraries Government Documents Department
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Application of Variational Methods to Transonic Flows With Shock Waves

Description: Note presenting a modification of certain variational methods for the approximate solution of subsonic and transonic flows to compensate for the fact that those methods fail as soon as shock waves occur. By applying a variational principle to the regions of flow behind shock waves and Bateman's original principle to the other regions in the fluid, shock equations can be directly obtained.
Date: November 1951
Creator: Wang, Chi-Teh & Chou, Pei-Chi
Partner: UNT Libraries Government Documents Department
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Hydrodynamic Investigation of a Series of Hull Models Suitable for Small Flying Boats and Amphibians

Description: Note presenting the results of an investigation to obtain hydrodynamic information on a series of hull models suitable for small flying boats or amphibians of from 2000 to 5000 pounds gross weight. The series of hulls consisted of a basic hull with simple lines, and of plus and minus variations to the design in which the beam, stern-post angle, and afterbody length were altered. The results show that it is possible to design a hull with simple lines that will be suitable for small flying boats … more
Date: November 1951
Creator: Hugli, W. C., Jr. & Axt, W. C.
Partner: UNT Libraries Government Documents Department
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