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  Partner: UNT Libraries Government Documents Department
 Decade: 1940-1949
 Year: 1940
 Month: October
Aerodynamic heating and the deflection of drops by an obstacle in an air stream in relation to aircraft icing

Aerodynamic heating and the deflection of drops by an obstacle in an air stream in relation to aircraft icing

Date: October 1, 1940
Creator: Kantrowitz, Arthur
Description: Two topics of interest to persons attempting to apply the heat method of preventing ice formation on aircraft are considered. Surfaces moving through air at high speed are shown, both theoretically and experimentally, to be subject to important aerodynamic heating effects that will materially reduce the heat required to prevent ice. Numerical calculations of the path of water drops in an air stream around a circular cylinder are given. From these calculations, information is obtained on the percentage of the swept area cleared of drops.
Contributing Partner: UNT Libraries Government Documents Department
Blueberries.

Blueberries.

Date: October 1940
Creator: Darrow, George M. (George McMillan), 1889-
Description: Discusses aspects of blueberry production in the United States from planting through harvesting and marketing, and examines different types of blueberries.
Contributing Partner: UNT Libraries Government Documents Department
The cause of welding cracks in aircraft steels

The cause of welding cracks in aircraft steels

Date: October 1, 1940
Creator: Muller, J
Description: The discussion in this article refers to gas welding of thin-walled parts of up to about 3 mm thickness. It was proven that by restricting the sulphur, carbon, and phosphorous content, and by electric-furnace production of the steel, it was possible in a short time to remove this defect. Weld hardness - i.e., martensite formation and hardness of the overheated zone - has no connection with the tendency to weld-crack development. Si, Cr, Mo, or V content has no appreciable effect, while increased manganese content tends to reduce the crack susceptibility.
Contributing Partner: UNT Libraries Government Documents Department
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 & Wynia, S
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
Drag analysis of single-engine military airplanes tested in the NACA full-scale wind tunnel

Drag analysis of single-engine military airplanes tested in the NACA full-scale wind tunnel

Date: October 1, 1940
Creator: Silverstein, Abe
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Farm bulk storage for small grains.

Farm bulk storage for small grains.

Date: October 1940
Creator: Kelley, M. A. R. (Manley Alexander Raymond), 1888-1943. & Boerner, E. G. (Emil George), b. 1878.
Description: Describes the types of structures used for storing bulk grains on the farm.
Contributing Partner: UNT Libraries Government Documents Department
Full-Scale Tests of Several Propellers Equipped with Spinners, Cuffs, Airfoil and Round Shanks, and NACA 16-Series Sections, Special Report

Full-Scale Tests of Several Propellers Equipped with Spinners, Cuffs, Airfoil and Round Shanks, and NACA 16-Series Sections, Special Report

Date: October 1, 1940
Creator: Biermann, David; Hartman, Edwin P. & Pepper, Edward
Description: Wind-tunnel tests of several propeller, cuff, and spinner combinations were conducted in the 20 foot propeller-research tunnel. Three propellers, which ranged in diameter from 8.4 to 11.25 feet, were tested at the front end of a streamline body incorporating spinners of two diameters. The tests covered a blade angle range from 20 deg to 65 deg. The effect of spinner diameter and propeller cuffs on the characteristics of one propeller was determined. Test were also conducted using a propeller which incorporated aerodynamically good shank sections and using one which incorporated the NACA 16 series sections for the outer 20 percent of the blades. Compressibility effects were not measured, owing to the low testing speeds. The results indicated that a conventional propeller was slightly more efficient when tested in conjunction with a 28 inch diameter spinner than with a 23 inch spinner, and that cuffs increased the efficiency as well as the power absorption characteristics. A propeller having good aerodynamic shanks was found to be definitely superior from the efficiency standpoint to a conventional round-shank propeller with or without cuffs; this propeller would probably be considered structurally impracticable, however. The propeller incorporating the NACA 16 series sections at the tims were ...
Contributing Partner: UNT Libraries Government Documents Department
Handling rough rice to produce high grades.

Handling rough rice to produce high grades.

Date: October 1940
Creator: Smith, W. D. (William Daniel), 1893-
Description: Describes the best methods for producing and handling rough rice, which yields higher grades and profits.
Contributing Partner: UNT Libraries Government Documents Department
How to grow rice in the Sacramento Valley.

How to grow rice in the Sacramento Valley.

Date: October 1940
Creator: Jones, Jenkin W. (Jenkin William), 1888-
Description: Discusses the importance of rice as a crop. Explains in detail the methods for producing rice in the climate of the Sacramento Valley of California.
Contributing Partner: UNT Libraries Government Documents Department
Internal-flow systems for aircraft

Internal-flow systems for aircraft

Date: October 1, 1940
Creator: Rogallo, F M
Description: An investigation has been made to determine efficient arrangements for an internal-flow system of an aircraft when such a system operates by itself or in combination with other flow systems. The investigation included a theoretical treatment of a problem and tests in the NACA 5-foot vertical wind tunnel of inlet and outlet openings in a flat plate and in a wing. When an internal-flow system tends to decrease the final velocity of it's wake, the results showed that it should be arranged in series with the propulsive system; the inlet opening should be located at a forward stagnation point; and the outlet opening should be so shaped and located as to recover the kinetic energy of the jet without increasing the drag of other portions of the aircraft. When an internal-flow system tends to increase the final velocity new b's wake, as does a propeller, location of the inlet opening in the boundary layer or in the wake of the wing or in the fuselage may be desirable.
Contributing Partner: UNT Libraries Government Documents Department
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