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  Partner: UNT Libraries Government Documents Department
 Decade: 1940-1949
 Year: 1940
Aerodynamic characteristics of horizontal tail surfaces

Aerodynamic characteristics of horizontal tail surfaces

Date: January 1, 1940
Creator: Silverstein, Abe
Description: Collected data are presented on the aerodynamic characteristics of 17 horizontal tail surfaces including several with balanced elevators and two with end plates. Curves are given for coefficients of normal force, drag, and elevator hinge moment. A limited analysis of the results has been made. The normal-force coefficients are in better agreement with the lifting-surface theory of Prandtl and Blenk for airfoils of low aspect ratio than with the usual lifting-line theory. Only partial agreement exists between the elevator hinge-moment coefficients and those predicted by Glauert's thin-airfoil theory.
Contributing Partner: UNT Libraries Government Documents Department
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
Aerodynamics of rotating-wing aircraft with blade-pitch control

Aerodynamics of rotating-wing aircraft with blade-pitch control

Date: February 1, 1940
Creator: Pfluger, A
Description: In the present report, with the aid of the usual computation methods, a rotor is investigated the pitch of whose blades is capable of being controlled in such a manner that it varies linearly with the flapping angle. To test the effect of this linkage on the aircraft performance, the theory is applied to an illustrative example.
Contributing Partner: UNT Libraries Government Documents Department
The aileron as an aid to recovery from the spin

The aileron as an aid to recovery from the spin

Date: September 1, 1940
Creator: Neihouse, A I
Description: As part of a general investigation by the NACA of factors that affect the spin, the use of the aileron as an aid to recovery from the spin was studied. Tests of 10 different models, covering a wide range of mass distribution, were made in the NACA free-spinning tunnel to determine the effects of a large downward deflection of the outboard aileron and of normal angular deflections of the ailerons upon recovery characteristics. The results indicate that the direction of aileron setting, with or against the spin, which will aid recovery from the spin depends upon the airplane weight distribution. For monoplanes and for biplanes with lower-wing ailerons, ailerons with the spin will be favorable when the weight is distributed chiefly along the fuselage (single-engine airplanes) and ailerons against the spin will be favorable when the weight is distributed chiefly along the wings (multi engine airplanes). Downward movement of the outboard aileron through a large angle will not always be effective in aiding recovery, the effectiveness of such a movement also being dependent upon the weight distribution of the airplane.
Contributing Partner: UNT Libraries Government Documents Department
Alfalfa varieties in the United States.

Alfalfa varieties in the United States.

Date: 1940
Creator: Westover, H. L. (Harvey Leroy)
Description: Describes the different types of alfalfa grown in the United States.
Contributing Partner: UNT Libraries Government Documents Department
Analysis of cylinder-pressure-indicator diagrams showing effects of mixture strength and spark timing

Analysis of cylinder-pressure-indicator diagrams showing effects of mixture strength and spark timing

Date: August 1, 1940
Creator: Gerrish, Harold C
Description: An investigation was made to determine the effect of mixture strength and of normal as well as optimum spark timing on the combustion, on the cylinder temperature, and on the performance characteristics of an engine. A single-cylinder test unit utilizing an air-cooled cylinder and a carburetor and operating with gasoline having an octane rating of 92 was used. The investigation covered a range of fuel-air ratios from 0.053 to 0.118. Indicator diagrams and engine-performance data were taken for each change in engine conditions. Examination of the indicator shows that for fuel-air ratios less than and greater than 0.082 the rate and the amount of effective fuel burned decreased. For a fuel-air ratio of 0.118 the combustion efficiency was only 58 percent. Advancing the spark timing increased the rate of pressure rise. This effect was more pronounced with leaner mixtures.
Contributing Partner: UNT Libraries Government Documents Department
Analysis of wind-tunnel data on directional stability and control

Analysis of wind-tunnel data on directional stability and control

Date: September 1, 1940
Creator: Pass, H R
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Annual report of the National Advisory Committee for Aeronautics (25th).administrative report including Technical Report nos. 645 to 680

Annual report of the National Advisory Committee for Aeronautics (25th).administrative report including Technical Report nos. 645 to 680

Date: January 1, 1940
Creator: unknown
Description: Report includes the National Advisory Committee for Aeronautics letter of submittal to the President, summaries of the committee's activities and research accomplished, bibliographies, and financial report.
Contributing Partner: UNT Libraries Government Documents Department
Apple blotch.

Apple blotch.

Date: 1940
Creator: Roberts, John W. (John William), 1882-1957.
Description: Describes the disease of apple blotch, how it spreads, and ways to control it.
Contributing Partner: UNT Libraries Government Documents Department
Apple growing east of the Mississippi River.

Apple growing east of the Mississippi River.

Date: July 1940
Creator: Gould, H. P.
Description: Describes the various factors that should be taken into consideration when developing and maintaining apple orchards, including: types of soil, climate conditions, the selecting and handling of young trees, the use of fertilizers, methods of pruning and spraying, and methods of repelling pests.
Contributing Partner: UNT Libraries Government Documents Department
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