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  Partner: UNT Libraries Government Documents Department
 Decade: 1940-1949
 Year: 1940
Corrections on the thermometer reading in an air stream

Corrections on the thermometer reading in an air stream

Date: October 1, 1940
Creator: Van Der Maas, H J
Description: A method is described for checking a correction formula, based partly on theoretical considerations, for adiabatic compression and friction in flight tests and determining the value of the constant. It is necessary to apply a threefold correction to each thermometer reading. They are a correction for adiabatic compression, friction and for time lag.
Contributing Partner: UNT Libraries Government Documents Department
Correlation Index to Aid in Interpreting Crude-Oil Analyses

Correlation Index to Aid in Interpreting Crude-Oil Analyses

Date: 1940
Creator: Smith, Harold M.
Description: Report issued by the Bureau of Mines discussing the correlation index used for analyses of crude oils. The correlation index is presented and described in detail. This report includes tables, and illustrations.
Contributing Partner: UNT Libraries Government Documents Department
Correlation of cooling data from an air-cooled cylinder and several multicylinder engines

Correlation of cooling data from an air-cooled cylinder and several multicylinder engines

Date: January 1, 1940
Creator: Pinkel, Benjamin
Description: The theory of engine-cylinder cooling developed in a previous report was further substantiated by data obtained on a cylinder from a Wright r-1820-g engine. Equations are presented for the average head and barrel temperatures of this cylinder as functions of the engine and the cooling conditions. These equations are utilized to calculate the variation in cylinder temperature with altitude for level flight and climb. A method is presented for correlating average head and barrel temperatures and temperatures at individual points on the head and the barrel obtained on the test stand and in flight. The method is applied to the correlation and the comparison of data obtained on a number of service engines. Data are presented showing the variation of cylinder temperature with time when the power and the cooling pressure drop are suddenly changed.
Contributing Partner: UNT Libraries Government Documents Department
Correlation of knocking characteristics of fuels in an engine having a hemispherical combustion chamber

Correlation of knocking characteristics of fuels in an engine having a hemispherical combustion chamber

Date: July 1, 1940
Creator: Rothrock, A M
Description: Data are presented to show the effects of inlet-air pressure, inlet-air temperature, and compression ratio on the maximum permissible performance obtained with having a hemispherical-dome combustion chamber. The five aircraft-engine fuels used have octane numbers varying from 90 to 100 plus 2 ml of tetraethyl lead per gallon. The data were obtained on a 5 1/4-inch by 4 3/4-inch liquid-cooled engine operating at 2,500 r.p.m. The compression ratio was varied from 6.0 to 8.9. The inlet-air temperature was varied from 110 to 310 F. For each set of conditions, the inlet-air pressure was increased until audible knock occurred and then reduced 2 inches of mercury before data were recorded. The results for each fuel can be correlated by plotting the calculated end-gas density factor against the calculated end-gas temperature. Measurements of spark-plugs, cutting off the switch to one spark plug lowered the electrode temperature of that plug from a value of 1,365 F to a value of 957 F. The results indicate that the surface temperatures of combustion-chamber areas which become new sources of ignition markedly increase after ignition.
Contributing Partner: UNT Libraries Government Documents Department
Cottonseed treatment.

Cottonseed treatment.

Date: March 1940
Creator: Haskell, R. J.
Description: Describes the methods of treating cottonseed to prevent disease or decay.
Contributing Partner: UNT Libraries Government Documents Department
Creep strength of stabilized wrought-aluminum alloys

Creep strength of stabilized wrought-aluminum alloys

Date: November 1, 1940
Creator: Muller, W
Description: Rohn-type equipment has been mounted on rubber blocks, for the purpose of damping the vibrations of the ground and of rendering the plastic yielding of the test bars less subject to outside interferences. New equipment also included three shockproof creep-testing machines with the Martens mirror instruments for recording the strain curve of the fatigue-tested specimens.
Contributing Partner: UNT Libraries Government Documents Department
Cyclic stress-strain studies of metals in torsion

Cyclic stress-strain studies of metals in torsion

Date: December 1, 1940
Creator: Paul, D A
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Damping formulas and experimental values of damping in flutter models

Damping formulas and experimental values of damping in flutter models

Date: February 1, 1940
Creator: Coleman, Robert P
Description: The problem of determining values of structural damping for use in flutter calculations is discussed. The concept of equivalent viscous damping is reviewed and its relation to the structural damping coefficient g introduced in NACA Technical Report No. 685 is shown. The theory of normal modes is reviewed and a number of methods are described for separating the motions associated with different modes. Equations are developed for use in evaluating the damping parameters from experimental data. Experimental results of measurements of damping in several flutter models are presented.
Contributing Partner: UNT Libraries Government Documents Department
Deciduous-fruit improvement through tree-performance records.

Deciduous-fruit improvement through tree-performance records.

Date: 1940
Creator: Shamel, A. D. (Archibald Dixon), 1878-
Description: Discusses commercial production of deciduous fruits based on the culture of established, profitable varieties. Describes the use of individual tree-records, the negative impacts of undesirable trees, and how to locate and isolate them.
Contributing Partner: UNT Libraries Government Documents Department
Design charts relating to the stalling of tapered wings

Design charts relating to the stalling of tapered wings

Date: January 1, 1940
Creator: Soule, H A
Description: An aid in airplane design, charts have been prepared to show the effects of wing taper, thickness ratio, and Reynolds number on the spanwise location of the initial stalling point. Means of improving poor stalling characteristics resulting from certain combinations of the variables have also been considered; additional figures illustrate the influence of camber increase to the wing tips, washout, central sharp leading edges, and wing-tip slots on the stalling characteristics. Data are included from which the drag increases resulting from the use of these means can be computed. The application of the data to a specific problem is illustrated by an example.
Contributing Partner: UNT Libraries Government Documents Department