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Airship Model Tests in the Variable Density Wind Tunnel

Description: This report presents the results of wind tunnel tests conducted to determine the aerodynamic characteristics of airship models. Eight Goodyear-Zeppelin airship models were tested in the original closed-throat tunnel. After the tunnel was rebuilt with an open throat a new model was tested, and one of the Goodyear-Zeppelin models was retested. The results indicate that much may be done to determine the drag of airships from evaluations of the pressure and skin-frictional drags on models tested at… more
Date: January 27, 1931
Creator: Abbott, Ira H.
Partner: UNT Libraries Government Documents Department
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Clerget 100 Hp Heavy-Oil Engine

Description: A complete technical description of the Clerget heavy-oil engine is presented along with the general characteristics. The general characteristics are: 9 cylinders, bore 120 mm, stroke 130 mm, four-stroke cycle engine, rated power limited to 100 hp at 1800 rpm; weight 228 kg; propeller with direct drive and air cooling. Moving parts, engine block, and lubrication are all presented.
Date: January 1931
Creator: Léglise, Pierre
Partner: UNT Libraries Government Documents Department
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Coal-Mine Fatalities in December, 1930

Description: Report issued by the U.S. Bureau of Mines on the coal mine related deaths during December, 1930. The number of fatalities and the causes are presented. This report includes tables.
Date: January 1931
Creator: Adams, William Waugh & Chenoweth, L.
Partner: UNT Libraries Government Documents Department
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The Comparative Performance of Superchargers

Description: "This report presents a comparison of superchargers on the basis of the power required to compress the air at a definite rate, and on the basis of the net engine power developed at altitudes from 0 to 40,000 feet. The investigation included geared centrifugal, turbine-driven centrifugal, roots, and vane-type superchargers. It also includes a brief discussion of the mechanical limitations of each supercharger and explains how the method of control affects the power requirements" (p. 425).
Date: January 13, 1931
Creator: Schey, Oscar W.
Partner: UNT Libraries Government Documents Department
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The effect of small angles of yaw and pitch on the characteristics of airplane propellers

Description: This report presents the results of wind tunnel tests to determine the effect on the characteristics of a propeller of inclining the propeller axis at small angles to the relative wind. Tests were made of a full-scale propeller and fuselage combination at four angles of yaw (0 degree, +5 degrees, +10 degrees, +15 degrees), and of a model propeller, nacelle, and wing combination of five angles of pitch (-5 degrees, 0 degree, +5 degrees, +10 degrees and +15 degrees). The results of the full-scale… more
Date: January 20, 1931
Creator: Freeman, Hugh B.
Partner: UNT Libraries Government Documents Department
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The effect of small variations in profile of airfoils

Description: This report deals with the effect of small variations in ordinates specified by different laboratories for the airfoil section. This study was made in connection with a more general investigation of the effect of small irregularities of the airfoil surface on the aerodynamic characteristics of an airfoil. These tests show that small changes in airfoil contours, resulting from variations in the specified ordinates, have a sufficiently large effect upon the airfoil characteristics to justify the … more
Date: January 1931
Creator: Ward, Kenneth E.
Partner: UNT Libraries Government Documents Department
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Focke-Wulf F 19a "Ente" Commercial Airplane (German): A Tail-First High-Wing Monoplane

Description: Circular presenting a description of the Focke-Wulf F 19a "Ente" aircraft, which includes the unique design feature of the horizontal control surfaces being placed at the forward end of the fuselage while the wing is farther aft. Details of the design, aerodynamic characteristics, wings, controls, landing gear, power plant, fuel tanks, characteristics, drawings, and photographs are provided.
Date: January 1931
Partner: UNT Libraries Government Documents Department
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The Hanriot H 431 Military Airplane (French): A General Purpose Biplane

Description: Circular presenting a description of the Hanriot H 431, which was designed to meet the requirements of the French War Ministry for general purpose airplanes. Details are provided for the design, flying qualities, and improvements over other aircraft designs.
Date: January 1931
Partner: UNT Libraries Government Documents Department
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Lift and drag characteristics of a cabin monoplane determined in flight

Description: From Summary: "The results of flight tests conducted by the NACA to determine the lift and drag characteristics of a full-scale airplane are given herein. A Fairchild FC-2W2 cabin monoplane having a Gottingen 387 wing section was used for the tests. The maximum lift coefficient for the airplane is compared with that obtained for the Gottingen 387 airfoil in recent tests in the Variable Density Tunnel. The maximum lift coefficient for the airplane was found to be 1.50 and that for the airfoil 1.… more
Date: January 1931
Creator: Thompson, F. L. & Keister, P. H.
Partner: UNT Libraries Government Documents Department
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A method for computing leading-edge loads

Description: From Summary: "In this report a formula is developed that enables the determination of the proper design load for the portion of the wing forward of the front spar. The formula is inherently rational in concept, as it takes into account the most important variables that affect the leading-edge load, although theoretical rigor has been sacrificed for simplicity and ease of application. Some empirical corrections, based on pressure distribution measurements on the PW-9 and M-3 airplanes have been… more
Date: January 16, 1931
Creator: Rhode, Richard V. & Pearson, Henry A.
Partner: UNT Libraries Government Documents Department
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The pressure distribution over a square wing tip on a biplane in flight

Description: This note presents the results obtained in pressure distribution tests on the right upper panel of a Douglas M-3 airplane in flight. These tests are a part of an extensive investigation on the effect of changes in tip shape on the load distribution.
Date: January 1931
Creator: Rhode, Richard V. & Lundquist, Eugene E.
Partner: UNT Libraries Government Documents Department
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Resistance of Plates and Pipes at High Reynolds Numbers

Description: It was learned that the law of resistance for high R values does not follow the simple powers, and that the powers, which can be obtained approximately for the velocity distribution, gradually change. Since, moreover, very important investigations have recently been made on the resistance of plates at very high R values, it seemed of interest to apply the above line of reasoning to the new general law of resistance. For this purpose, the resistance and velocity distribution along the plate must… more
Date: January 1931
Creator: Schiller, L. & Hermann, R.
Partner: UNT Libraries Government Documents Department
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Wrinkling of Reinforced Plates Subjected to Shear Stresses

Description: An analysis is made here of the problem of long plates with transverse stiffeners subject to shear. A typical example would be a long Wagner beam. The shear stress is calculated at which the web wrinkles and shear stress becomes a maximum. The equation is solved for both a condition of free support and rigidity of support on the edges.
Date: January 1931
Creator: Seydel, Edgar
Partner: UNT Libraries Government Documents Department
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Wrinkling Phenomena of Thin Flat Plates Subjected to Shear Stresses

Description: This report covers a series of tests on thin flat elastic strips restrained at two parallel edges and subjected to shear by conversely directed stresses. Theoretical treatments, particularly those of Lilly, Southwell and Skan, and Timoshenko are briefly outlined. The problem to be solved by these tests was to find out whether, and to what extent the conditions and assumptions upon which the calculations are based are complied with in the tests.
Date: January 1931
Creator: Bollenrath, F.
Partner: UNT Libraries Government Documents Department
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