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Moments of inertia of several airplanes

Description: This paper, which is the first of a series presenting the results of such measurements, gives the momental ellipsoids of ten army and naval biplanes and one commercial monoplane. The data were obtained by the use of a pendulum method, previously described. The moments of inertia are expressed in coefficient as well as in dimensional form, so that those for airplanes of widely different weights and dimensions can be compared.
Date: May 1931
Creator: Miller, Marvel P. & Soulé, Hartley A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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The pressure distribution over a semicircular wing tip on an airplane in flight

Description: This note presents the results of flight pressure distribution tests on the right upper wing panel of a Douglas M-3 airplane equipped with a semicircular wing tip. The results are given in tables and curves in such form that the load distribution for any force coefficient within the usual range encountered in flight may easily be determined.
Date: May 1931
Creator: Rhode, Richard V. & Lundquist, Eugene E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Aeronautical education and research at the Swiss Institute of Technology in Zurich

Description: Progress in the scientific and practical fields of aviation has caused the Swiss Institute of Technology to organize lectures and practical training courses in all three branches of aeronautics and to found centers of scientific research, laboratories, etc., in order to supply the government and industries with scientifically and technically trained engineers.
Date: April 1931
Creator: Karner, L. & Ackeret, J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Coal-Mine Fatalities in March, 1931

Description: Report issued by the U.S. Bureau of Mines on the coal mine related deaths that occurred during the month of March, 1931. The number of fatalities and their causes are listed. This report includes tables.
Date: April 1931
Creator: Adams, William Waugh & Chenoweth, L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Development of an Impinging-Jet Fuel-Injection Valve Nozzle

Description: "During an investigation to determine the possibilities and limitations of a two-stroke-cycle engine and ignition, it was necessary to develop a fuel injection valve nozzle to produce a disk-shaped, well dispersed spray. Preliminary tests showed that two smooth jets impinging upon each other at an angle of 74 degrees gave a spray with the desired characteristics. Nozzles were built on this basis and, when used in fuel-injection valves, produced a spray that fulfilled the original requirements" … more
Date: April 1931
Creator: Spanogle, J. A. & Hemmeter, G. T.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Experiments With an Airfoil Model on Which the Boundary Layers Are Controlled Without the Use of Supplementary Equipment

Description: This report describes test made in the Variable Density Wind Tunnel of the NACA to determine the possibility of controlling the boundary layer on the upper surface of an airfoil by use of the low pressure existing near the leading edge. The low pressure was used to induce flow through slots in the upper surface of the wing. The tests showed that the angle of attack for maximum lift was increased at the expense of a reduction in the maximum lift coefficient and an increase in the drag coefficien… more
Date: April 1931
Creator: Abbott, Ira H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Investigation of Certain Wing Shapes With Sections Varying Progressively Along the Span

Description: This investigation has a double object: 1) the calculation of the general characteristics of certain wings with progressively varying sections; 2) the determination of data furnishing, in certain cases, some information on the actual distribution of the external forces acting on a wing. We shall try to show certain advantages belonging to the few wing types of variable section which we shall study and that, even if the general aerodynamic coefficients of these wings are not often clearly superi… more
Date: April 1931
Creator: Arsandaux, L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Investigation of the Discharge Rate of a Fuel-Injection System

Description: In connection with the development of a method for analyzing indicator cards taken from high-speed compression-ignition engines, this investigation was undertaken to determine the average quantity of fuel discharged during each crank degree of injection period.
Date: April 1931
Creator: Gerrish, Harold C. & Voss, Fred
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Preliminary study of applied load factors in bumpy air

Description: Theoretical relations involved in the study are reviewed to furnish a basis upon which experimental data can be properly analyzed. The structure of the atmosphere in relation to the load-factor problem is briefly discussed, and the acceleration data obtained on a number of flights with various airplanes are presented and analyzed to the extent that the results are applicable to n=any airplane.
Date: April 1931
Creator: Rhode, Richard V. & Lundquist, Eugene E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Relative economy of different methods of airplane construction

Description: "A comparison of the relative economy of airplane construction shows that monoplanes are cheaper than biplanes; that all-metal construction is much more expensive than mixed construction; that multi-engine airplanes are more expensive than single-engine types of the same carrying capacity and speed;that the cost of airplanes is materially reduced by increasing their size without increasing the number of engines. The greatest economy usually coincides with the best aerodynamic and static conditi… more
Date: April 1931
Creator: Herrmann, H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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The S.P.C.A. 40 T Commercial Airplane (French): An All-Metal Cantilever Monoplane

Description: Circular describing the S.P.C.A. 40 T, which is a commercial all-metal cantilever airplane that was guided by the two essential requirements of economy and safety in its design. Details of the design, power, test results, fuel tanks, characteristics, performances, drawings, and photographs are provided.
Date: April 1931
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Strength Tests on Paper Cylinder in Compression, Bending and Shear

Description: "Static tests on paper cylinders were conducted at the Langley Memorial Aeronautical Laboratory at Langley Field, Virginia, to obtain qualitative information in connection with a study of the strength of stressed-skin fuselages. The effects of radius-thickness ratio and bulkhead spacing were investigated with the cylinders in compression, bending, combined bending and shear, and torsion" (p. 1).
Date: April 1931
Creator: Rhode, Richard V. & Lundquist, Eugene E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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A Study of Curvilinear Flight

Description: "When an airplane describes a curve it takes a certain time for it to turn from level to inclined position and then back to level again. In the following, we express the motion about the horizontal axis as "roll" or "bank" and the motion perpendicular to the vertical axis, i.e., the actual curve, as "turn." Equations and tables provide results on various aspects of turns, control settings, acceleration, inertia moments, and angular velocity" (p. 2).
Date: April 1931
Creator: Kruse, Helmuth
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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The Transference of Heat From a Hot Plate to an Air Stream

Description: The object of the present study was to define experimentally the field of temperature and velocity in a heated flat plate when exposed to an air stream whose direction is parallel to it, then calculate therefrom the heat transference and the friction past the flat plate, and lastly, compare the test data with the mathematical theory. To ensure comparable results, we were to actually obtain or else approximate: a) two-dimensional flow; b) constant plate temperature in the direction of the stream… more
Date: April 1931
Creator: Elias, Franz
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Investigation of damping liquids for aircraft instruments 2

Description: "Data are presented on the kinematic viscosity, in the temperature range -50 degrees to +30 degrees C. of pure liquids and of solutions of animal oils, vegetable oils, mineral oils, glycerine, and ethylene glycol in various low freezing point solvents. It is shown that the thermal coefficient of kinematic viscosity as a function of the kinematic viscosity of the solutions of glycerine and ethylene glycol in alcohols is practically independent of the temperature and the chemical composition of t… more
Date: March 28, 1931
Creator: Houseman, M. R. & Keulegan, G. H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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A New Principle of Sound Frequency Analysis

Description: "In connection with the study of aircraft and propeller noises, the National Advisory Committee for Aeronautics has developed an instrument for sound-frequency analysis which differs fundamentally from previous types, and which, owing to its simplicity of principle, construction, and operation, has proved to be of value in this investigation. The method is based on the well-known fact that the Ohmic loss in an electrical resistance is equal to the sum of the losses of the harmonic components of… more
Date: March 23, 1931
Creator: Theodorsen, Theodore
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Hydraulics of Fuel-Injection Pumps for Compression-Ignition Engines

Description: "Formulas are derived for computing the instantaneous pressures delivered by a fuel pump. The first derivation considers the compressibility of the fuel and the second, the compressibility, elasticity, and inertia of the fuel. The second derivation follows that given by Sass; it is shown to be the more accurate of the two. Additional formulas are given for determining the resistance losses in the injection tube" (p. 621).
Date: March 6, 1931
Creator: Rothrock, A. M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Span-load distribution as a factor in stability in roll

Description: "This report gives the results of pressure-distribution tests made to study the effects on lateral stability of changing the span-load distribution on a rectangular monoplane wing model of fairly thick section. Three methods of changing the distribution were employed: variation in profile along the span to a thin symmetrical section at the tip, twist from +5 degrees to -15 degrees at the tip, and sweepback from +20 degrees to -20 degrees. The tests were conducted in a 5-foot closed-throat atmos… more
Date: March 4, 1931
Creator: Knight, Montgomery & Noyes, Richard W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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The drag characteristics of several airships determined by deceleration tests

Description: This report presents the results of deceleration tests conducted for the purpose of determining the drag characteristics of six airships. The tests were made with airships of various shapes and sizes belonging to the Army, the Navy, and the Goodyear-Zeppelin Corporation. Drag coefficients for the following airships are shown: Army TC-6, TC-10, and TE-2; Navy Los Angeles and ZMC-2; Goodyear Puritan. The coefficients vary from about 0.045 for the small blunt airships to 0.023 for the relatively l… more
Date: March 2, 1931
Creator: Thompson, F. L. & Kirschbaum, H. W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Coal-Mine Fatalities in February, 1931

Description: Report issued by the U.S. Bureau of Mines on the coal mine related deaths during the month of February, 1931. The number of fatalities and the causes of each are presented. This report includes tables.
Date: March 1931
Creator: Adams, William Waugh & Chenoweth, L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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