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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: 1940
Creator: Silverstein, Abe & Katzoff, S
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 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 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 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 1940
Creator: Gerrish, Harold C & Voss, Fred
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
An analysis of the stability of an airplane with free controls

An analysis of the stability of an airplane with free controls

Date: August 15, 1940
Creator: Jones, Robert T & Cohen, Doris
Description: Report presents the results of an investigation made of the essentials to the stability of an airplane with free control surfaces. Calculations are based on typical airplane characteristics with certain factors varied to cover a range of current designs. Stability charts are included to show the limiting values of the aerodynamic hinge moments and the weight hinge moments of the control surfaces for various positions of the center of gravity of the airplane and for control systems with various moments of inertia. The effects of reducing the chord and of eliminating the floating tendency of the surface, of changing the wing loading, and of decreasing the radius of gyration of the airplane are also indicated. An investigation has also been made of the nature of the motion of the airplane with controls free and of the modes of instability that may occur.
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 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: 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. & Pierce, Leslie.
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
Apple-orchard renovation.

Apple-orchard renovation.

Date: 1940
Creator: Gould, H. P.
Description: Describes various methods for maximizing the quality and output of apple orchards.
Contributing Partner: UNT Libraries Government Documents Department
The application of basic data on planing surfaces to the design of flying-boat hulls

The application of basic data on planing surfaces to the design of flying-boat hulls

Date: January 1940
Creator: Diehl, Walter S.
Description: Basic lift data on planing surfaces have been analyzed and the data applied to the design of flying-boat hulls. It is shown that a balance between air and water forces requires that the beam of the planing area bear a relation to the wing area that is determined by the lift coefficient of the wing and by the angle of dead rise in the planing surface. It is also shown that the fore-and-aft extent of the required planing area depends on the angle of dead rise. Failure to provide sufficient length of planing area appears to be the main reason for the poor water performance sometimes obtained when a large angle of dead rise is used.
Contributing Partner: UNT Libraries Government Documents Department
Application of the methods of gas dynamics to water flows with free surface I : flows with no energy dissipation

Application of the methods of gas dynamics to water flows with free surface I : flows with no energy dissipation

Date: March 1940
Creator: Preiswerk, Ernst
Description: The application is treated in sufficient detail to facilitate as much as possible its application by the engineer who is less familiar with the subject. The present work was undertaken with two objects in view. In the first place, it is considered as a contribution to the water analogy of gas flows, and secondly, a large portion is devoted to the general theory of the two-dimensional supersonic flows.
Contributing Partner: UNT Libraries Government Documents Department
Application of the methods of gas dynamics to water flows with free surface II : flows with momentum discontinuities (hydraulic jumps)

Application of the methods of gas dynamics to water flows with free surface II : flows with momentum discontinuities (hydraulic jumps)

Date: March 1940
Creator: Preiswerk, Ernst
Description: In this paper an introduction to shock polar diagrams is given which then leads into an examination of water depths in hydraulic jumps. Energy loss during these jumps is considered along with an extended look at elementary solutions of flow. An experimental test set-up is described and the results presented.
Contributing Partner: UNT Libraries Government Documents Department
An Approximate Method of Calculation of Relative Humidity Required to Prevent Frosting on Inside of Aircraft Pressure Cabin Windows, Special Report

An Approximate Method of Calculation of Relative Humidity Required to Prevent Frosting on Inside of Aircraft Pressure Cabin Windows, Special Report

Date: December 5, 1940
Creator: Jones, Alun R.
Description: This report has been prepare in response to a request for information from an aircraft company. A typical example was selected for the presentation of an approximate method of calculation of the relative humidity required to prevent frosting on the inside of a plastic window in a pressure type cabin on a high speed airplane. The results of the study are reviewed.
Contributing Partner: UNT Libraries Government Documents Department
Bean growing in northern Idaho, eastern Washington, and eastern Oregon.

Bean growing in northern Idaho, eastern Washington, and eastern Oregon.

Date: 1940
Creator: Hunter, Byron, b. 1869.
Description: Describes best practices for profitable bean-growing in the northwestern United States.
Contributing Partner: UNT Libraries Government Documents Department
Biology of the seed-corn maggot in the coastal plain of the South Atlantic states

Biology of the seed-corn maggot in the coastal plain of the South Atlantic states

Date: June 1940
Creator: Reid, W. J. (William John), 1902- & Hall, D. G.
Description: Describes the seed-corn maggot of the south Atlantic states at different stages of life, its history, and its habits.
Contributing Partner: UNT Libraries Government Documents Department
Black walnut for timber and nuts.

Black walnut for timber and nuts.

Date: 1940
Creator: Mattoon, Wilbur R. (Wilbur Reed), 1875-1941. & Reed, C. A. (Clarence Arthur), 1880-1950.
Description: A guide to growing black walnut trees for timber, nut crops, or ornamental use.
Contributing Partner: UNT Libraries Government Documents Department
Blackleg : its nature, cause, and prevention.

Blackleg : its nature, cause, and prevention.

Date: 1940
Creator: Mohler, John R. (John Robbins), b. 1875.
Description: Describes blackleg, a livestock disease. Explains how to recognize, treat, and prevent it.
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
Boundary-Layer Transition on the N.A.C.A. 0012 and 23012 Airfoils in the 8-Foot High-Speed Wind Tunnel

Boundary-Layer Transition on the N.A.C.A. 0012 and 23012 Airfoils in the 8-Foot High-Speed Wind Tunnel

Date: January 1, 1940
Creator: Becker, John V
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Boundary-Layer Transition on the N.A.C.A. 0012 and 23012 Airfoils in the 8-Foot High-Speed Wind Tunnel, Special Report

Boundary-Layer Transition on the N.A.C.A. 0012 and 23012 Airfoils in the 8-Foot High-Speed Wind Tunnel, Special Report

Date: January 1, 1940
Creator: Becker, John V.
Description: Determinations of boundary-layer transition on the NACA 0012 and 2301 airfoils were made in the 8-foot high-speed wind tunnel over a range of Reynolds Numbers from 1,600,000 to 16,800,000. The results are of particular significance as compared with flight tests and tests in wind tunnels of appreciable turbulence because of the extremely low turbulence in the high-speed tunnel. A comparison of the results obtained on NACA 0012 airfoils of 2-foot and 5-foot chord at the same Reynolds Number permitted an evaluation of the effect of compressibility on transition. The local skin friction along the surface of the NACA 0012 airfoil was measured at a Reynolds Number of 10,000,000. For all the lift coefficient at which tests were made, transition occurred in the region of estimated laminar separation at the low Reynolds Numbers and approach the point of minimum static pressure as a forward limit at the high Reynolds Numbers. The effect of compressibility on transition was slight. None of the usual parameters describing the local conditions in the boundary layer near the transition point served as an index for locating the transition point. As a consequence of the lower turbulence in the 8-foot high-speed tunnel, the transition points occurred consistently ...
Contributing Partner: UNT Libraries Government Documents Department
Breaking and training colts.

Breaking and training colts.

Date: 1940
Creator: Stamburgh, V. G. (Vivian Guy), 1885-; Williams, J. O. (John Oscar), 1885- & Krantz, Earl B. (Earl Beach), 1893-
Description: Describes methods training horses for farm use. Includes training or control methods for driving, riding, shoeing, and throwing.
Contributing Partner: UNT Libraries Government Documents Department
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