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Effect of Stabilizing Forces on Turbulence

Description: The appearance of expressed discontinuity layers in the free atmosphere, where a warm air mass flows over a cold mass without perceptible intermingling forms the basis of the present report. In these experiments an air stream is to be blown between a water-cooled and a vapor-heated plate. According to what preceded it is anticipated that the exchange will be enhanced.
Date: June 1931
Creator: Prandtl, L.
Partner: UNT Libraries Government Documents Department
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The New "Charlestop" Remote Brake Transmission and Control

Description: This report presents a description, diagrams and photographs of the Charlestop remote brake system. A description of the brake system and diagrams showing the individual components are provided.
Date: October 1931
Creator: Léglise, Pierre
Partner: UNT Libraries Government Documents Department
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Basic Requirements of Fuel-Injection Nozzles for Quiescent Combustion Chambers

Description: This report presents test results obtained during an investigation of the performance of a single-cylinder, high-speed, compression-ignition test engine when using multiple-orifice fuel-injection valve nozzles in which the number and the direction of the orifices were varied independently.
Date: June 1931
Creator: Spanogle, J. A. & Foster, H. H.
Partner: UNT Libraries Government Documents Department
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Metal-Truss Wing Spars

Description: The purpose of the study was to develop improvements in the current methods for the calculation of the loads in members of metal truss wing spars which are subjected to combined bending and compression. The theory developed here has two important practical applications. One is the calculation of the effective moment of inertia of a truss spar from the geometry of the spar and the loads to which the spar is to be subjected. The second is the determination of the most economical location of metal… more
Date: July 1931
Creator: Swickard, Andrew E.
Partner: UNT Libraries Government Documents Department
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The Effect of Injection-Valve Opening Pressure on Spray-Tip Penetration

Description: "The effect of various injection-valve opening pressures on the spray-tip penetration was determined for several injection pressure. A common-rail fuel injection system was used. For a given injection pressure a maximum rate of penetration was obtained with an injection-valve opening pressure equal to the injection pressure" (p. 1).
Date: July 1931
Creator: Rothrock, A. M. & Marsh, E. T.
Partner: UNT Libraries Government Documents Department
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Tests of Six Symmetrical Airfoils in the Variable Density Wind Tunnel

Description: "This paper is the first of a series covering an investigation of a family of airfoils all formed from a basic profile. It gives in preliminary form the results of six symmetrical airfoils, differing only in maximum thickness. The maximum thickness-to-chord ratios are 0.06, 0.09, 0.12, 0.15, 0.18, and 0.21" (p. 1).
Date: July 1931
Creator: Jacobs, Eastman N.
Partner: UNT Libraries Government Documents Department
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Effect of Nose Shape on the Characteristics of Symmetrical Airfoils

Description: Tests of nine symmetrical airfoils, having different leading-edge radii, were made in the variable density wind tunnel. Three symmetrical NACA airfoils having maximum thickness-to-chord ratio of 0.06, 0.012, and 0.018 were used as basic (or normal) sections; and for each of these thicknesses one thinner and one blunter nose section were developed. Although the slope of the lift curve varies with thickness, these tests show that for any given thickness the slope is independent of nose radius.
Date: August 1931
Creator: Pinkerton, Robert M.
Partner: UNT Libraries Government Documents Department
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The pressure distribution over a modified elliptical wing tip on a biplane 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 modified elliptical tip having a slight amount of washout. The results are given in tables and curves in such form that the load distribution for any normal force coefficient within the usual range encountered in flight may be determined.
Date: August 1931
Creator: Lundquist, Eugene E. & Rhode, Richard V.
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
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.
Partner: UNT Libraries Government Documents Department
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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.
Partner: UNT Libraries Government Documents Department
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Effect of High Air Velocities on the Distribution and Penetration of a Fuel Spray

Description: "By means of the NACA Spray Photography Equipment high speed moving pictures were taken of the formation and development of fuel sprays from an automatic injection valve. The sprays were injected normal to and counter to air at velocities from 0 to 800 feet per second. The air was at atmosphere temperature and pressure. The results show that high air velocities are an effective means of mixing the fuel spray with the air during injection" (p. 1).
Date: May 1931
Creator: Rothrock, A. M.
Partner: UNT Libraries Government Documents Department
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An integrating manometer for use in wind tunnel pressure distribution measurements

Description: A multiple manometer designed to integrate automatically the normal force over an airfoil section is described and its mathematical theory explained. The development of this instrument was conducted at the Langley Memorial Aeronautical Laboratory.
Date: May 1931
Creator: Noyes, Richard W.
Partner: UNT Libraries Government Documents Department
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Comparison of Weights of 17ST and Steel Tubular Structural Members Used in Aircraft Construction

Description: Although the strong aluminum alloys have proved themselves to be very efficient in aircraft construction there is a growing competition from the high-strength steels for certain parts, especially for tubular members. This tendency is being reflected in research work carried on at the Bureau of Standards. This study will be based largely on data given in Technical Note No. 307 of the NACA.
Date: May 1931
Creator: Hartmann, E. C.
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.
Partner: UNT Libraries Government Documents Department
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A Suggested Method for Measuring Turbulence

Description: The desirability of a quantitative measure of turbulence is emphasized, and a possible method of attack on the problem is discussed. Data are presented to show that the hot-wire anemometer has possibilities as an instrument for measuring turbulence. An apparatus consisting essentially of two hot wire, one parallel to the air flow and one at right angles to it, is suggested.
Date: June 1931
Creator: Taylor, C. Fayette
Partner: UNT Libraries Government Documents Department
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Endurance and Other Properties at Low Temperatures of Some Alloys for Aircraft Use

Description: "The low temperature endurance properties of materials for aircraft construction are not well known. In order to determine them, apparatus for testing endurance at -40 C has been devised. The endurance properties of monel metal, low-carbon stainless steel, "18 and *, " 3 1/2% Ni steel and chromium-molybdenum steel have been determined at -40 C and at room temperature about +20 C. Tensile, impact and hardness tests of these materials have also been made at various temperatures" (p. 1).
Date: June 1931
Creator: Russell, H. W. & Welcker, W. A., Jr.
Partner: UNT Libraries Government Documents Department
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Some characteristics of fuel sprays at low-injection pressures

Description: "This report presents the results of tests conducted at the Langley Memorial Aeronautical Laboratory, Langley Field, Va., to determine some of the characteristics of the fuel sprays obtained from an 0.008-inch and a 0.020-inch open nozzle when injection pressures from 100 to 500 pounds per square inch were used. Fuel oil and gasoline were injected into air at densities of atmospheric land 0.325 pound per cubic foot. It was found that the penetration rate at these low pressures was about the sam… more
Date: November 1931
Creator: Rothrock, A. M. & Waldron, C. D.
Partner: UNT Libraries Government Documents Department
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Effect of Orifice Length-Diameter Ratio on the Coefficient of Discharge of Fuel-Injection Nozzles

Description: The variation of the coefficient of discharge with the length-diameter ratio of the orifice was determined for nozzles having single orifice 0.008 and 0.020 inch in diameter. Ratios from 0.5 to 10 were investigated at injection pressures from 500 to 5,000 pounds per square inch. The tests showed that, within the error of the observation, the coefficients were the same whether the nozzles were assembled at the end of a constant tube or in an automatic injection valve having a plain stem.
Date: March 1931
Creator: Gelalles, A. G. & Marsh, E. T.
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.
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.
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.
Partner: UNT Libraries Government Documents Department
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The Oehmichen Peugeot Helicopter

Description: The first flights of the Oehmichen helicopter are detailed as well as various aspects of the construction.
Date: March 1931
Partner: UNT Libraries Government Documents Department
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