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A flight investigation to increase the safety of a light airplane

Description: Report presenting information about a series of modifications incorporated into light airplanes to increase safety, including decreasing the wing incidence, increasing the wing washout, increasing the area and aspect ratio of the horizontal and vertical tails, moving the elevators out of propeller slipstreams, depressing the thrust axis, and limiting the rudder travel. The new inherent safety characteristics and effects on the airplane's performance are provided.
Date: March 1947
Creator: Hunter, P. A. & Vensel, J. R.
Partner: UNT Libraries Government Documents Department
open access

Data on Optimum Length, Shear Strength, and Tensile Strength of Age-Hardened 17S-T Machine-Countersunk Rivets in 75S-T Sheet

Description: Report presenting a series of tensile-strength and shear-strength tests made on age-hardened 17S-T rivets machine-countersunk in 75S-T sheets. The results of the tests indicated that the joints can be made satisfactorily with regard to both flushness and strength if the ratio of buck to diameter is kept to a certain value.
Date: March 1947
Creator: Schuette, Evan H. & Niles, Donald E.
Partner: UNT Libraries Government Documents Department
open access

The streamline pattern in the vicinity of an oblique airfoil

Description: "A method for determining the streamwise flow pattern of a nonviscous incompressible fluid about an oblique airfoil from the corresponding flow pattern about the airfoil in normal position is presented and illustrated in two examples. The method can be extended to account approximately for compressibility effects by applying the Prandtl-Glauert correction factor to the flow pattern that is normal to the leading edge of the airfoil. The method is expected to be useful in determining the shape of… more
Date: March 1947
Creator: Watkins, Charles E.
Partner: UNT Libraries Government Documents Department
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Experimental Investigation of the Stress Distribution Around Reinforced Circular Cut-Outs in Skin Stringer Panels Under Axial Loads

Description: Note presenting results of strain surveys around four reinforced circular cut-outs successively made in an axially loaded skin-stringer tension panel. Curves are presented which show the distribution of stringer and shear stresses in the panel and bending stresses in the reinforcing rings.
Date: March 1947
Creator: Farb, Daniel
Partner: UNT Libraries Government Documents Department
open access

Frequency-Response Method for Determination of Dynamic Stability Characteristics of Airplanes With Automatic Controls

Description: Note presenting a frequency-response method for determining the critical control-gearing and hunting oscillations of airplanes with automatic pilots. The method is graphical and has several advantages over the standard numerical procedure based on Routh's discriminant. Several examples are worked out to illustrate the application of the frequency-response method in determining the effect of automatic-pilot lag or lead on critical control gearing and in determining the amplitude and frequency of… more
Date: March 1947
Creator: Greenberg, Harry
Partner: UNT Libraries Government Documents Department
open access

Preliminary Analysis of NACA Measurements of Atmospheric Turbulence Within a Thunderstorm - U.S. Weather Bureau Thunderstorm Project

Description: "A general description of the field operations of the U.S. Weather Bureau thunderstorm project conducted in the vicinity of Orlando, Florida during the summer month of 1946 is given. The participation of NACA in this project is described and measurements of atmospheric turbulence taken by NACA are presented for one of the flights. The results indicate that some regions of thunderstorms may present no great hazard to flight, while exceptionally severe conditions of atmospheric turbulence may occ… more
Date: March 1947
Creator: Tolefson, Harold B.
Partner: UNT Libraries Government Documents Department
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Number of inoperative rods

Description: No Description Available.
Date: March 17, 1947
Creator: Wende, C. W. J.
Partner: UNT Libraries Government Documents Department
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Extraction of Uranium from Iron Box Sludge

Description: It was desired to establish the adaptability of iron box sludge, a residue recovered in the initial concentration of domestic ores, as a raw material from the production of high purity U{sub 3}O{sub 8}. This report summarizes the experimental work on the extraction of uranium from iron box sludge and that on the removal of V{sub 2}O{sub 5} and P{sub 2}O{sub 5} from the solutions.
Date: March 11, 1947
Creator: O'Connors, R. J.
Partner: UNT Libraries Government Documents Department
open access

Distribution of Boron in Processing of Carnotite Concentrate

Description: It was desired to determine the distribution of boron in the various steps of the processing of domestic ore concentrates containing high percentages of boron. The experiments described in this report were directed toward that end. Summary of this report are: (1) a black oxide containing 0.6 ppm of boron was prepared from material containing 350 ppm; (2) less than 0.02% of the boron in the original material appeared in the black oxide; (3) the iron step did not remove appreciable amounts of bor… more
Date: March 13, 1947
Creator: O'Connors, R. J.
Partner: UNT Libraries Government Documents Department
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Processing of Special Metal for Hanford

Description: The object of this project is to reduce the impurities and raise the density of rejected slugs and briquetted turnings from these slugs by recasting the material. Summary and conclusions are (1) slugs and briquettes made from turnings produced when these slugs were machined can be recast with great improvement in quality; (2) casting this material is quite hard on graphite crucibles, but a long-range program might point the way to better graphite usage; (3) this metal run alone gives fair yield… more
Date: March 10, 1947
Creator: Oppold, William A.
Partner: UNT Libraries Government Documents Department
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The Recovery of C14 From Irradiated Beryllium Nitride

Description: Both acid and alkaline dissolutions of Be/sub 3/N/sub 2/ were carried The recommended alkaline dissolution procedure is outlined. (M.H.R.)
Date: March 1, 1947
Creator: Fries, B. A.
Partner: UNT Libraries Government Documents Department
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Reclamation of Contaminated Kinney and Diffusion Pump Oils and Removal of Uranium Therefrom

Description: Abstract: Test distillations were made with Kinney and diffusion pump oils under vacuum in order to determine accurately the temperature range over which satisfactory distillate may be collected. Also recommendations are made as to the most advisable type of heating equipment necessary to produce the required heat and maintain the desired temperature. In addition, several important refinements in the distillation equipment were checked for operational characteristics and for their efficiency in… more
Date: March 10, 1947
Creator: Lee, J. E. Jr.; Aikin, L. M. & Susano, C. D.
Partner: UNT Libraries Government Documents Department
open access

Progress Report for the Month of March, 1947 : Contract No. W-38-094-eng-27

Description: This report for March, 1947 describes progress regarding chemical and spectrographic analysis, chemical work, physical methods of analysis, and ore dressing and pyrometallurgical studies,
Date: March 31, 1947
Creator: Center, E. J.; Nelson, H. R.; Pray, H. A.; Richardson, A. C. & Sullivan, J. D.
Partner: UNT Libraries Government Documents Department
open access

On subsonic compressible flows by a method of correspondence I - methods for obtaining subsonic circulatory compressible flows about two-dimensional bodies

Description: From Summary: "By means of the general solutions of the hodograph equations for compressible fluids, certain solutions corresponding to solutions of the hodograph equations of an incompressible fluid are used to find flow patterns of compressible fluids. When the adiabatic equation of state is used, only a general method is outlined. The method appears to lead to the solution of the problem of subsonic flows with circulation around arbitrary bodies, as the method of Theodorsen does for incompre… more
Date: March 1947
Creator: Gelbart, Abe
Partner: UNT Libraries Government Documents Department
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Comparative Tests on Extruded 14S-T and Extruded 24S-T Hat-Shape Stiffener Sections

Description: Note presenting an investigation to compare the 14S-T with 24S-T in extruded stiffeners for stiffened flat sheet panels. The tests were made with stiffened flat sheet panels with three hat-shape stiffeners. Data is provided on the strength of the two alloys as well as the effect of sheet thickness on relative stiffener strengths.
Date: March 1947
Creator: Holt, Marshall & Feil, G. W.
Partner: UNT Libraries Government Documents Department
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Summary of lateral-control research

Description: Report presenting a summary of the available information on lateral control. Some of the topics include the criterions used in lateral-control specifications, the factors involved in obtaining satisfactory lateral control, and the methods employed in making lateral-control investigations in flight and wind tunnels.
Date: March 1947
Creator: Toll, Thomas A.
Partner: UNT Libraries Government Documents Department
open access

Effect of Slipstream Rotation in Producing Asymmetric Forces on a Fuselage

Description: Note presenting an approximate theory of the effect of slipstream rotation on the forces on a fuselage without a wing, which represents the slipstream rotation by the flow about a vortex aligned with the longitudinal axis. A wind-tunnel investigation was made primarily to check the predictions for the lateral force on a fuselage shaped as a body of revolution.
Date: March 1947
Creator: Ribner, Herbert S. & MacLachlan, Robert
Partner: UNT Libraries Government Documents Department
open access

Effect of Reflex Camber on the Aerodynamic Characteristics of a Highly Tapered Moderately Swept-Back Wing at Reynolds Numbers Up to 8,000,000

Description: Report presenting testing at Reynolds numbers up to 8,000,000 to determine the effectiveness of a reflex-cambered mean line in shifting the low-drag range of a sweptback wing without affecting the longitudinal stability. Two models were tested, one with symmetrical airfoil sections and one with a reflex-cambered mean line. Results regarding the effect of camber, roughness, and variation of aerodynamic characteristics with Reynolds number are provided.
Date: March 1947
Creator: Conner, D. William
Partner: UNT Libraries Government Documents Department
open access

A collection of the collapsed results of general tank tests of miscellaneous flying-boat-hull models

Description: Presented here are the summary charts of the collapsed results of general tank tests of about 100 flying boat hull models. These summary charts are intended to be used as an engineering tool to enable a flying boat designer to grasp more quickly the significance of various hull form parameters as they influence his particular airplane. The form in which the charts are prepared is discussed in some detail in order to make them clearer to the designer. This is a data report, and no attempt has be… more
Date: March 1947
Creator: Locke, F. W. S., Jr.
Partner: UNT Libraries Government Documents Department
open access

Performance of a Radial-Inlet Impeller Designed on the Basis of Two-Dimensional-Flow Theory for an Infinite Number of Blades

Description: Note presenting an investigation of a radial-inlet impeller based on two-dimensional-flow theory to establish correlation between flow theory and impeller performance. The simplifying assumptions of an infinite number of blades and an incompressible fluid were made for the impeller design. Results regarding performance characteristics based on standard overall measurements, performance characteristics based on static-pressure measurements, and hydraulic-efficiency characteristics are provided.
Date: March 1947
Creator: Johnsen, I. A.; Ritter, W. K. & Anderson, R. J.
Partner: UNT Libraries Government Documents Department
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Tank investigation of a powered dynamic model of a large long-range flying boat - Langley tank model 180

Description: Report presenting an investigation of the principles for designing the optimum hull for a large long-range flying boat to meet the requirements of seaworthiness, minimum drag, and ability to take off and land at all operational gross loads. The aerodynamic and hydrodynamic qualities of the model were investigated in Langley tank no. 1.
Date: March 1947
Creator: Parkinson, John B.; Olson, Roland E. & Haar, Marvin I.
Partner: UNT Libraries Government Documents Department
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The flow and force characteristics of supersonic airfoils at high subsonic speeds

Description: Report presenting an investigation at subsonic Mach numbers in the rectangular high-speed tunnel on five supersonic airfoils and, for comparison, on two subsonic airfoils. Two-dimensional data were obtained by pressure measurements and schileren photographs at angles of attack from 0 to 4 degrees for a range of Mach numbers between 0.30 and 0.90. Results regarding pressure distributions, normal-force coefficients, pitching-moment of normal-force about the quarter-chord point, drag coefficient, … more
Date: March 1947
Creator: Lindsey, W. F.; Daley, Bernard N. & Humphreys, Milton D.
Partner: UNT Libraries Government Documents Department
open access

The Formation and Stability of Normal Shock Waves in Channel Flows

Description: Note presenting an analysis of nonviscous unsteady channel flow in order to gain some insight into instability resulting from shock-free deceleration in order to provide more information on the factors determining the minimum shock intensity for a stable flow and to study in general the formation and motion of shocks in channel flows.
Date: March 1947
Creator: Kantrowitz, Arthur
Partner: UNT Libraries Government Documents Department
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