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Flutter and divergence of rectangular wings of very low aspect ratio

Description: From Summary: "Slender-body aerodynamic theory is used in conjunction with thin-plate theory in the flutter analysis of low-aspect-ratio rectangular wings of constant thickness when chordwise variations of deflections are considered. The spanwise variation of deflection is given by a parabola, and the chordwise variation is allowed complete freedom. The results show the variation of flutter speed and mode shape with aspect ratio."
Date: June 28, 1957
Creator: Fralich, Robert W.; Hedgepeth, John M. & Tuovila, W. J.
Partner: UNT Libraries Government Documents Department

Low-speed cascade investigation of thin low-camber NACA 65-series blade sections at high inlet angles

Description: Report presenting an investigation of 6-percent-thick NACA 65-series compressor blade sections in a two-dimensional porous-wall cascade tunnel at several lift coefficients, angles of attack, and solidities. The useful operating angle-of-attack range was generally found to decrease as inlet angle increases.
Date: June 28, 1957
Creator: Emery, James C.
Partner: UNT Libraries Government Documents Department

Effects of airplane flexibility on wing bending strains in rough air

Description: Some results on the effects of wing flexibility on wing bending strains as determined from flight tests of a Boeing B-29 and a Boeing B-47A airplane in rough air are presented. Results from an analytical study of the flexibility effects on the B-29 wing strains are compared with the experimental results. Both the experimental and calculated results are presented as frequency-response functions of the bending strains at various spanwise wing stations to gust disturbances. In addition, some indirect evidence of the effect of spanwise variations in turbulence on the response of the B-47A airplane is presented.
Date: July 1, 1957
Creator: Coleman, Thomas L.; Press, Harry & Shufflebarger, C. C.
Partner: UNT Libraries Government Documents Department

Ground effects on the longitudinal characteristics of two models with wings having low aspect ratio and pointed tips

Description: Wind-tunnel tests were conducted to determine the ground effects on a tailless model with a wing of aspect ratio 2 and infinite taper, and on a tailed model with a triangular wing of aspect ratio 3, with flaps. Control-surface hinge moments were measured on the tailless model. The results are compared with the predictions of the theory of Tani, et al.
Date: July 1, 1957
Creator: Buell, Donald A & Tinling, Bruce E
Partner: UNT Libraries Government Documents Department

Handbook of Structural Stability Part I: Buckling of Flat Plates

Description: The various factors governing buckling of flat plates are critically reviewed and the results are summarized in a comprehensive series of charts and tables. Numerical values are presented for buckling coefficients of flat plates with various boundary conditions and applied loadings. The effects of plasticity are incorporated in non dimensional buckling charts utilizing the three-parameter description of stress-strain curves.
Date: July 1, 1957
Creator: Gerard, George & Becker, Herbert
Partner: UNT Libraries Government Documents Department

Handbook of structural stability part II : buckling of composite elements

Description: The local buckling of stiffener sections and the buckling of plates with sturdy stiffeners are reviewed, and the results are summarized in charts and tables. Numerical values of buckling coefficients are presented for longitudinally compressed stiffener sections of various shapes, for stiffened plates loaded in longitudinal compression and in shear, and for stiffened cylinders loaded in torsion. Although the data presented consist primarily of elastic-buckling coefficients, the effects of plasticity are discussed for a few special cases. (author).
Date: July 1, 1957
Creator: Becker, Herbert
Partner: UNT Libraries Government Documents Department

Mineralogy, Internal Structural and Textural Characteristics, and Paragenesis of Uranium-Bearing Veins in the United States

Description: From introduction: The purpose of this paper is to summarize and review some of the recent mineralogic information relevant to uranium-bearing veins in the United States, as well as to describe some of the reported mineralogic associations and the modes of occurrence of the uranium minerals in vein deposits.
Date: July 1957
Creator: Walker, George Walton & Adams, John W.
Partner: UNT Libraries Government Documents Department

National Motor-Gasoline Survey: Winter 1956-57

Description: Report issued by the U.S. Bureau of Mines discussing surveys conducted on the motor gasoline sold during the winter of 1956-1957. The amount, location, and price of gasoline sold during this time are presented. This report includes tables, illustrations, and a map.
Date: July 1957
Creator: Blade, O. C.
Partner: UNT Libraries Government Documents Department