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Aerodynamic characteristics at subsonic and supersonic Mach numbers of a thin triangular wing of aspect ratio 2 2: maximum thickness at midchord

Description: "The lift, drag, and pitching-moment characteristics of a triangular wing, having an aspect ratio of 2 and a symmetrical double-wedge profile of 5-percent-chord maximum thickness at midchord, have been evaluated from wind-tunnel tests at Mach numbers from 0.50 to 0.975 and from 1.09 to 1.49 and at Reynolds numbers ranging from 0.67 to 0.85 million. The lift, drag, and pitching-moment coefficients of the triangular wing with a leading-edge sweepback of approximately 63 degrees did not exhibit th… more
Date: December 3, 1948
Creator: Walker, Harold J. & Berggren, Robert E.
Item Type: Refine your search to only Report
open access

Altitude-Wind-Tunnel Investigation of a 3000-Pound-Thrust Axial-Flow Turbojet Engine, 7, Pressure and Temperature Distributions

Description: Temperature and pressure distributions for an original and modified 3000 pound thrust axial flow turbojet engine were investigated. Data are included for a range of simulated altitudes from 5000 to 45000 feet, Mach numbers from 0.24 to 1.08, and corrected engine speeds from 10,550 to 13,359 rpm.
Date: December 10, 1948
Creator: Saari, Martin J. & Prince, William R.
Item Type: Refine your search to only Report
open access

Altitude-wind-tunnel investigation of tail-pipe burning with a Westinghouse X24C-4B axial-flow turbojet engine

Description: From Summary: "Thrust augmentation of an axial-flow type turbojet engine by burning fuel in the tail pipe has been investigated in the NACA Cleveland altitude wind tunnel. The performance was determined over a range of simulated flight conditions and tail-pipe fuel flows. The engine tail pipe was modified for the investigation to reduce the gas velocity at the inlet of the tail-pipe combustion chamber and to provide an adequate seat for the flame; four such modifications were investigated."
Date: December 13, 1948
Creator: Fleming, William A. & Wallner, Lewis E.
Item Type: Refine your search to only Report
open access

An Analysis of Project Data on the Corrosion of Uranium in Various Media

Description: This is a summarizing and reviewing report in which almost all the experimental data representing Project work done prior to 1949 on the corrosion of pure uranium are brought together and analyzed. New data obtained in this laboratory on corrosion rates in laboratory atmosphere and on the identification of corrosion products by electron diffraction are included. The data for corrosion in each of several different media have been plotted according to logarithm-of-the-rate versus reciprocal-tempe… more
Date: December 22, 1948
Creator: Waber, James T. (James Thomas), 1920-
Item Type: Refine your search to only Report
open access

An analysis of the airspeeds and normal accelerations of Boeing B-247 and B-247D airplanes in commercial transport operation

Description: From Introduction: "The results of analyses of V-G data given in references 1 to 5 have shown that the flight loads of airplanes operated in commercial transport service are influenced by operating speeds and by forecasting and dispatching practices as reflected in differences between operations during the prewar and wartime periods. The available data are summarized and the flight results are compared with the results of analyses made in references 1 to 5."
Date: December 1948
Creator: Walker, Walter G. & Hadlock, Ivan K.
Item Type: Refine your search to only Report
open access

The application of Green's theorem to the solution of boundary-value problems in linearized supersonic wing theory

Description: From Introduction: "The present paper is restricted to a discussion of wing theory subject to the assumptions of linearized compressible flow. It therefore employs solutions of Laplace's equation and the wave equation for cases where the boundary condition are specified in the plane of the wing."
Date: December 22, 1948
Creator: Heaslet, Max A. & Lomax, Harvard
Item Type: Refine your search to only Report
open access

Calculated Performance of a Compression-Ignition Engine-Compressor-Turbine Combination Based on Experimental Data

Description: Note presenting calculations based on test data taken on a single-cylinder compression-ignition engine with a compression ratio of 13.1 and an engine speed of 2200 rpm to determine the performance at sea-level conditions of a compression-ignition engine geared together with a compressor and a turbine. The net specific power output increased with decreasing compression ratio and with increasing fuel-air ratio and engine speed.
Date: December 1948
Creator: Mendelson, Alexander
Item Type: Refine your search to only Report
open access

Calculation of the Aerodynamic Loading of Flexible Wings of Arbitrary Plan Form and Stiffness

Description: "A method is presented for calculating the aerodynamic loading, the divergence speed, and certain stability derivatives of wings and tail surfaces of arbitrary plan form and stiffness. Provision is made for using either stiffness curves and root-rotation constants or influence coefficients in the analysis. Computing forms, tables of numerical constants required in the analysis, and an illustrative example are included to facilitate calculations by means of the method" (p. 1).
Date: December 24, 1948
Creator: Diederich, Franklin W.
Item Type: Refine your search to only Report
open access

Calculation of the aerodynamic loading of swept and unswept flexible wings of arbitrary stiffness

Description: A method is presented for calculating the aerodynamic loading, the divergence speed, and certain stability derivatives of swept and unswept wings and tail surfaces of arbitrary stiffness. Provision is made for using either stiffness curves and root rotation constants or structural influence coefficients in the analysis. Computing forms, tables of numerical constants required in the analysis, and an illustrative example are included to facilitate calculations by means of the method.
Date: December 24, 1948
Creator: Diederich, Franklin W.
Item Type: Refine your search to only Report
open access

Calorimetry research progress report, March 1--31,, 1948

Description: Sixty-eight samples were assayed. The 5 calorimeters of type 30 were finished. Calorimeter 36, whose construction has been started, is an improved version of 30. A system of switches has been devised. A simple, fast, insensitive calorimeter for measuring high activity samples is being tested. The calculations on the half-life of postum were checked.
Date: December 31, 1948
Creator: Eichelberger, J.F.
Item Type: Refine your search to only Report
open access

The changes in the blood of humans chronically exposed to low level gamma radiation

Description: Ten individuals received an average of 0.211 roentgens of gamma radiation per week for a 77 period week (December 1946-June 1948) for a total average dose of 16.21 roentgens. During this period these 10 men carried out an experiment involving materials which emit gamma radiation and were monitored by daily film badges. The radiation delivered during a week was received in a five day work week and usually they received approximately one-half of their weekly dosage during one of the five days. A … more
Date: December 31, 1948
Creator: Knowlton, N.P. Jr.
Item Type: Refine your search to only Report
open access

Charts for the conical part of the downwash field of swept wings at supersonic speeds

Description: Report presenting analytical expressions derived from the downwash throughout the entire induced flow field of lifting triangles of infinite chord with the leading edges forward or behind the Mach cone. Results regarding the downwash charts, variation of downwash distribution with leading-edge sweep angle, and additional factors affecting the downwash are provided.
Date: December 1948
Creator: Nielsen, Jack N. & Perkins, Edward W.
Item Type: Refine your search to only Report
open access

Child's self-help overall.

Description: This document contains recommendations for the construction of a child's self-help overall, designed for freedom of movement and easy dressing.
Date: December 1948
Creator: Scott, Clarice L. (Clarice Louisba), b. 1899
Item Type: Refine your search to only Book
open access

Comparison of National Bureau of Standards ceramic coatings L-7C and A-417 on turbine blades in a turbojet engine

Description: Report presenting an investigation to determine which of two ceramic coatings, L-7C and A-417, developed by the National Bureau of Standards is more suitable as a protective coating for turbine blades in a turbojet engine. Four cast Vitallium turbine blades, two coated with each of the ceramics, were installed in a turbine wheel of a turbojet engine and subjected to accelerated cyclic life tests.
Date: December 22, 1948
Creator: Morse, C. Robert
Item Type: Refine your search to only Report
open access

Comparison of Theoretical and Experimental Heat-Transfer Characteristics of Bodies of Revolution at Supersonic Speeds

Description: "An investigation of the three important factors that determine convective heat-transfer characteristics at supersonic speeds, location boundary-layer transition, recovery factor, and heat-transfer parameter has been performed at Mach numbers from 1.49 to 1.18. The bodies of revolution that were tested had, in most cases, laminar boundary layers, and the test results have been compared with available theory. Boundary-layer transition was found to be affected by heat transfer" (p. 1301).
Date: December 17, 1948
Creator: Scherrer, Richard
Item Type: Refine your search to only Report
open access

Control considerations for optimum power proportionment in turbine-propeller engines

Description: Report presenting an analysis of a turbine-propeller engine operating at constant speed in order to provide information regarding factors influencing optimum proportionment of power between propeller and jet, improvement in engine performance attainable from controlled proportionment of power, and control relations for optimum proportionment of power.
Date: December 1948
Creator: Heidmann, Marcus F. & Novik, David
Item Type: Refine your search to only Report
open access

Control Section progress report, April 1--30, 1948

Description: From the Assay group, information is given for production concerning routine assaying, calorimetry, and neutron detection, unit 5, and future plans. The Micro-Assay group reports on production, development, research, units 5 & 6, and future plans. The Inventory group gives a report on production relating to alpha and DM slides, development of hoods,poppy counters and safe barriers, research, and future plans. Control Section Administration also reports on production of neutron counters, develop… more
Date: December 31, 1948
Creator: Rembold, E.A.
Item Type: Refine your search to only Report
open access

The Development of Cambered Airfoil Sections Having Favorable Lift Characteristics at Supercritical Mach Numbers

Description: "Several groups of new airfoil sections, designated as the NACA 8-series, are derived analytically to have lift characteristics at supercritical Mach numbers which are favorable in the sense that the abrupt loss of lift, characteristic of the usual airfoil section at Mach numbers above the critical, is avoided. Aerodynamic characteristics determined, from two-dimensional windtunnel tests at Mach numbers up to approximately 0.9 are presented for each of the derived airfoils. Comparisons are made… more
Date: December 1948
Creator: Graham, Donald J.
Item Type: Refine your search to only Report
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