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A General Method of Selecting Foam Inhibitors

Description: Note presenting a criterion for selecting foam inhibitors from insoluble liquids that form emulsions with the foaming liquid. By determining the surface tensions of the foaming liquid and of the additive saturated with that liquid and the interfacial tension between them, spreading and entering coefficients may be calculated. A mechanism of foam inhibition is also described.
Date: May 1946
Creator: Robinson, J. V. & Woods, W. W.
Partner: UNT Libraries Government Documents Department
open access

A preliminary study of a propeller powered by gas jets issuing from the blade tips

Description: From Summary: "Computations are made of the performance of a propeller designed to develop 56 thrust horsepower at 100 miles per hour. The fuel consumption of the jet-operated propeller would be considerably higher than that of a reciprocating engine and a propeller. The lighter weight of the jet-operated propeller will result in a lighter weight of engine plus fuel for short-range flights. A theoretical analysis is made of a propeller powered by gas jets issuing from the blade tips."
Date: November 1946
Creator: Sanders, J. C. & Sanders, N. D.
Partner: UNT Libraries Government Documents Department
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Comparison of relative sensitivities of the knock limits of two fuels to six engine variables

Description: Report presenting knock testing of a sensitive fuel and a relatively insensitive fuel in a full-scale air-cooled cylinder. Six engine variables were investigated: fuel-air ratio, compression ratio, inlet-air temperature, spark advance, exhaust pressure, and cylinder temperature.
Date: August 1946
Creator: Cook, Harvey A.; Held, Louis F. & Pritchard, Ernest I.
Partner: UNT Libraries Government Documents Department
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Flow Tests of an NACA-Designed Supercharger Inlet Elbow and the Effects of Various Components on the Flow Characteristics at the Elbow Outlet

Description: Note presenting an investigation on a supercharger inlet elbow designed to have a uniform velocity distribution at the outlet with a minimum pressure loss through the bend. The effects of a vane, an impeller-shaft housing, and the combination of the two on the outlet-velocity distribution and total pressure drop through the elbow were determined.
Date: October 1946
Creator: Guentert, D. C.; Todd, D. J. & Simmons, W. P., Jr.
Partner: UNT Libraries Government Documents Department
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Methods for Determination and Computation of Flow Patterns of a Compressible Fluid

Description: Note presenting a well-known method of generating stream functions of an incompressible fluid flow, which involves taking the imaginary part of an analytic function of a complex variable. This paper is specifically devoted to a detailed discussion of performing computations related to obtaining flow patterns of compressible fluid from analytic functions of a compressible fluid. An example is also provided to illustrate the method.
Date: September 1946
Creator: Bergman, Stefan
Partner: UNT Libraries Government Documents Department
open access

Performance of Hoods for Aircraft Exhaust-Gas Turbines

Description: Report presenting the performance of a turbosupercharger turbine with three types of exhaust hood. The results for conical hoods, flat-nozzle hoods, and short-turning-radius hoods are provided.
Date: November 1946
Creator: Turner, L. Richard; Lowdermilk, Warren H. & Lord, Albert M.
Partner: UNT Libraries Government Documents Department
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Compressive Strength of 24S-T Aluminum-Alloy Flat Panels With Longitudinal Formed Hat-Section Stiffeners

Description: "Results are presented for a part of a test program on 24S-T aluminum alloy flat compression panels with longitudinal formed hat-section stiffeners. This part of the program is concerned with panels in which the thickness of the stiffener materials is 0.625 times the skin thickness. The results, presented in tabular and graphical form, show the effect of the relative dimensions of the panel on the buckling stress and the average stress at maximum load" (p. 1).
Date: December 1946
Creator: Schuette, Evan H.; Barab, Saul & McCracken, Howard L.
Partner: UNT Libraries Government Documents Department
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The Synthesis and Purification of Aromatic Hydrocarbons 1: Butylbenzene

Description: "A 13-gallon quantity of butylbenzene was synthesized and purified by large-scale preparation of 4-phenyl-1-butene from benzyl-magnesium chloride and allyl chloride with subsequent hydrogenation of the olefin. The physical constants for pure samples of 4-phenyl-1-butene and butylbenzene were determined and the position of the double bond in the olefin was established" (p. 1).
Date: January 1946
Creator: Karabinos, Joseph V. & Lamberti, Joseph M.
Partner: UNT Libraries Government Documents Department
open access

A Relaxation Procedure for the Stress Analysis of a Continuous Beam-Column Elastically Restrained Against Deflection and Rotation at the Supports

Description: Note presenting a method of stress analysis for a continuous beam-column supported by deflectional and rotational springs. The principal feature of the method is the use of a relaxation procedure to determine the deflections and rotations of the supports. The shears and moments at the supports and between the supports can then be calculated with the aid of sample equations and graphs.
Date: October 1946
Creator: Hu, Pai C. & Libove, Charles
Partner: UNT Libraries Government Documents Department
open access

The effect of engine variables on the prediction-limited performance of three fuels

Description: Report presenting preignition-limited performance data for S reference fuel, diisobutylene, and benzene with an engine-heated hot spot on a supercharged CFR engine at 11 sets of engine operating conditions. Results indicated that increases in compression ratio, spark advance, coolant temperature, or inlet-air temperature decreased the preignition-limited indicated mean effective pressure of all three fuels.
Date: September 1946
Creator: Male, Donald W.
Partner: UNT Libraries Government Documents Department
open access

Flight investigation of the cooling characteristics of a two-row radial engine installation 3: engine temperature distribution

Description: From Summary: "The temperature distribution of a two-row radial engine in a twin-engine airplane has been investigated in a series of flight tests. The test engine was operated over a wide range of conditions at density altitudes of 5000 and 20,000 feet; quantitative results are presented showing the effects of flight and engine variables upon average engine temperature and over-all temperature spread. Discussions of the effect of the variables on the shape of the temperature patterns and on th… more
Date: October 1946
Creator: Rennak, Robert M.; Messing, Wesley E. & Morgan, James E.
Partner: UNT Libraries Government Documents Department
open access

Pressure Distributions for Representative Airfoils and Related Profiles

Description: Note presenting selected pressure-distribution diagrams for a number of conventional and special airfoils. The conventional airfoils include the NACA 22, 44, and 230 series airfoils and Clark Y family and the special airfoils consist of circular-arc sections of several thicknesses and a number of synthetic airfoils. The pressure distributions are in most cases given for several lift coefficients including that at the ideal angle of attack.
Date: February 1946
Creator: Theodorsen, Theodore & Naiman, Irven
Partner: UNT Libraries Government Documents Department
open access

An Electron Microscope Study of Used Nitrated-Steel Piston Rings

Description: Note presenting a study of the altered surface layers found on nitrided-steel piston rings run in nitrided-steel cylinder barrels in order to determine the physical and chemical characteristics of the altered layers and the mechanism by which the coating layers were formed. An electron and a light microscope were used to study different aspects of the materials.
Date: September 1946
Creator: Clark, Thomas P. & Vierthaler, Walter A.
Partner: UNT Libraries Government Documents Department
open access

Investigation of the Stability of the Laminar Boundary Layer

Description: Note presenting an investigation of the stability of two-dimensional laminar flows of a gas by the method of small perturbations. The chief emphasis is placed on the case of the laminar boundary layer.
Date: September 1946
Creator: Lees, Lester & Lin, Chia Chiao
Partner: UNT Libraries Government Documents Department
open access

A method for the determination of air infiltration rates in airplane cabins

Description: From Summary: "A method for the experimental determination of the rate of infiltration of air into aircraft cabins during flight has been developed and tested. This method consists of releasing a quantity of gas in the cabin and calculating the infiltration rate from the measured rate of change of the gas concentration. The results of the flight tests indicate that after the infiltration rate is established at one altitude and airspeed, the infiltration rates at other altitudes and airspeeds ca… more
Date: April 1946
Creator: Stalder, Jackson R. & Zeiller, E. Lewis
Partner: UNT Libraries Government Documents Department
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Stress Rupture of Heat Resisting Alloys as a Rate Process

Description: Note presenting the application of the equations of the theory of rate processes to stress rupture in order to predict the experimental stress and temperature dependence of the time for rupture for three heat-resisting alloys. Results regarding stress dependence, temperature dependence of slope factor, and temperature dependence of apparent free energy of activation are provided.
Date: September 1946
Creator: Machlin, E. S. & Nowick, A. S.
Partner: UNT Libraries Government Documents Department
open access

Strain-Gage Study of Internally Cooled Exhaust Valves Having Various Throat Designs

Description: Note presenting three internally cooled exhaust valves with the same external dimensions but different throat designs were investigated to determine a method of obtaining increased coolant-flow area with increasing stresses. The valves were statistically loaded to simulate stresses in the throat region caused by valve closure.
Date: August 1946
Creator: Holms, Arthur G. & Faldetta, Richard D.
Partner: UNT Libraries Government Documents Department
open access

The Synthesis and Purification of Aromatic Hydrocarbons 2: 1, 2, 4-Trimethylbenzene

Description: Note presenting a new method for the synthesis and purification of a 14-gallon quantity of 1,2,4-trimethylbenzene. The method consists in the chloromethylation of m- and p-xylenes, subsequent formation of ethyl dimethylbenzyl ethers, and hydrogenolysis of the ethers to yield the hydrocarbon. Results regarding chloromethylation of xylene, conversion of dimethylbenzyl chlorides to ethyl dimethylbenzyl ethers, hydrogenolysis of the ethyl dimethylbenzyl ethers, and identification of biproducts are … more
Date: January 1946
Creator: Ebersole, Earl R.
Partner: UNT Libraries Government Documents Department
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Turbosupercharger-Rotor Temperatures in Flight

Description: Note presenting temperatures of a turbosupercharger rotor measured in flight for a variety of conditions by thermocouples, the leads of which were brought away from the turbine by means of rotating slip rings and stationary brushes. A consistent and almost linear relation was shown between turbine temperature at the outer edge of the rim and the effective exhaust-gas temperature at the surfaces of the blades on three successive flights at cruising power.
Date: October 1946
Creator: Bartoo, Edward R.
Partner: UNT Libraries Government Documents Department
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The Synthesis and Purification of Aromatic Hydrocarbons 3: Isobutylbenzene, Sec-Butylebenzene and Tert-Butylbenzene

Description: Note presenting a description of the synthesis of isobutylbenzene, sec-butylbenzene, and tert-butylbenzene in 11-gallon quantities. The physical properties are tabulated and freezing curves are plotted for the five hydrocarbons.
Date: June 1946
Creator: Buess, C. M.; Karabinos, J. V.; Kunz, P. V. & Gibbons, L. C.
Partner: UNT Libraries Government Documents Department
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The infrared spectra of spiropentane methylenecyclobutane and 2-methyl-1-butene

Description: The infrared spectra of spiropentane, methylenecyclobutane, and 2-methyl-1-butene were measured in the region from 3 to 14 microns with a rock salt prism spectrometer of medium dispersion. The pure samples were prepared at the NACA Cleveland Laboratory. The vapors of these three C5 hydrocarbons were investigated at room temperature and at pressures in the range from 80 to 300 millimeters of mercury absolute in a 10-centimeter cell. The spectra were compared with each other and with Ramon spectr… more
Date: October 1946
Creator: Cleaves, Alden P. & Sherrick, Mildred E.
Partner: UNT Libraries Government Documents Department
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The synthesis of methylenecyclobutane, spiropentane, and 2-methyl-1-butene from pentaerythrityl tetrabromide

Description: From Summary: "Reduction of pentaerythrityl tetrabromide in ethanol with zinc in the presence of sodium carbonate and sodium iodide was found to yield methylenecyclobutane, spiropentane, and 2-methyl-l-butene. Yields were 46 percent methylenecyclobutane, 21 percent spiropentane, and 12 percent 2-methyl-l-butene. The reduction procedure described offers a method of preparing both methylenecyclobutane and spiropentane from the same reaction in yields comparable with individual methods of synthesi… more
Date: February 1946
Creator: Slabey, Vernon A.
Partner: UNT Libraries Government Documents Department
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Flow over a slender body of revolution at supersonic velocities

Description: "The theory of small disturbances is applied to the calculation of the pressure distribution and drag of a closed body of revolution traveling at supersonic speeds. It is shown that toward the rear of the body the shape of the pressure distribution is similar to that for subsonic flow. For fineness ratios between 10 and 15 the theoretical wave drag is of the same order as probable values of the frictional drag" (p. 1).
Date: August 1946
Creator: Jones, Robert T. & Margolis, Kenneth
Partner: UNT Libraries Government Documents Department
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