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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
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
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-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 1, 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
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
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
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
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