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  Partner: UNT Libraries Government Documents Department
 Decade: 1940-1949
 Year: 1940
 Month: November
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
The Effect of Initial Displacement of the Center Support on the Buckling of a Column Continuous Over Three Supports

The Effect of Initial Displacement of the Center Support on the Buckling of a Column Continuous Over Three Supports

Date: November 1, 1940
Creator: Kotanchik, Joseph N
Description: None
Contributing Partner: UNT Libraries Government Documents Department
The Effect of Initial Displacement of the Center Support on the Buckling of a Column Continuous over Three Supports

The Effect of Initial Displacement of the Center Support on the Buckling of a Column Continuous over Three Supports

Date: November 1, 1940
Creator: Lunquist, Eugene E.
Description: The test indicate that "an indiscriminate single application of the Southwell method (for analyzing Exp. Observations in problems of elastic stability)--can result in definite and measurable errors" The test also indicate "that the effect of curvature due to bending on the critical load for the compression flange material of a box beam is probably small and can be neglected." We have not found this to be true in our tests. It is believed that the effect of curvature, together with a small amount of fixity at the ribs, tends to force the stiffeners to bow in each bay thus effectively increasing their end fixity and thereby raising their allowable loads.
Contributing Partner: UNT Libraries Government Documents Department
Feeding dairy cows.

Feeding dairy cows.

Date: November 1940
Creator: Woodward, T. E. (Thompson Elwyn)
Description: Describes many types of dairy-cow feeds, their nutritive value, and their functions. Includes instructions for feed preparation and feeding recommendations for various situations.
Contributing Partner: UNT Libraries Government Documents Department
A Flight Investigation of Exhaust-Heat De-Icing

A Flight Investigation of Exhaust-Heat De-Icing

Date: November 1, 1940
Creator: Jones, Alun R
Description: The National Advisory Committee for Aeronautics conducted exhaust-heat de-icing tests in flight to provide data needed in the application of this method. The capacity to extract heat from the exhaust gas for de-icing purposes, the quantity of heat required, and other factors were examined. The results indicate that a wing-heating system employing a spanwise exhaust tube within the leading edge of the wing removed 30 to 35 percent of the heat from exhaust gas entering the wing. Data are given from which the heat required for ice prevention can be calculated. Sample calculations have been made on the basis of existing engine power/wing area ratios to show that sufficient heating can be obtained for ice protection on modern transportation airplanes, provided that uniform distribution of the heat can be secured.
Contributing Partner: UNT Libraries Government Documents Department
Flight Tests of Exhaust Gas Jet Propulsion

Flight Tests of Exhaust Gas Jet Propulsion

Date: November 1, 1940
Creator: Turner, L Richard
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Flight Tests of Exhaust Gas Jet Propulsion, Special Report

Flight Tests of Exhaust Gas Jet Propulsion, Special Report

Date: November 1, 1940
Creator: Pnkel, Benjamin
Description: Flight test s were conducted on the XP-41 airplane, equipped with a Pratt & Whitney R1830-19, 14-cylinder, air-cooled engine, to determine the increase in flight speed obtainable by the use of individual exhaust stacks directed rearwardly to obtain exhaust-gas thrust. Speed increases up to 18 miles per hour at 20,000 feet altitude were obtained using stacks having an exit area of 3.42 square inches for each cylinder. A slight increase in engine power and decrease in cylinder temperature at a given manifold pressure were obtained with the individual stacks as compared with a collector-ring installation. Exhaust-flame visibility was quite low, particularly in the rich range of fuel-air ratios.
Contributing Partner: UNT Libraries Government Documents Department
General relationships between the various systems of reference axes employed in flight mechanics

General relationships between the various systems of reference axes employed in flight mechanics

Date: November 1, 1940
Creator: Rautenberg, H J
Description: The different possibilities of orientation of the systems of axes currently employed in flight mechanics are compiled and described. Of the three possible couplings between the wind and aircraft axes, the most suitable coupling is that in which the y axis is made the principal axis of rotation for one of the two coupling angles (angles of attack). In connection with this coupling, an experimental system of axes is introduced, whose axes x(sub e) and z(sub e) are situated in the plane of symmetry of the airplane and rotate about the airplane lateral axis y = y(sub e). This system of axes enables the utilization of the coefficients obtained in the wind tunnel in the flight-mechanic equations by a simple transformation, with the aid of the angle of attack, measured in the plane of symmetry of the airplane.
Contributing Partner: UNT Libraries Government Documents Department
Grinding machines

Grinding machines

Date: November 26, 1940
Creator: United States. Army. Air Corps
Description: This report provides the definition of grinding and discusses different processes, types, and operations of grinding.
Contributing Partner: UNT Libraries Government Documents Department
Heat-transfer tests of a steel cylinder barrel with aluminum fins of optimum proportions

Heat-transfer tests of a steel cylinder barrel with aluminum fins of optimum proportions

Date: November 1, 1940
Creator: Mann, Alvin H
Description: None
Contributing Partner: UNT Libraries Government Documents Department
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