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The aerodynamic characteristics of three tapered airfoils tested in the variable density wind tunnel

The aerodynamic characteristics of three tapered airfoils tested in the variable density wind tunnel

Date: February 1, 1931
Creator: Anderson, Raymond F
Description: This report contains the lift, drag, and moment characteristics of tapered Clark Y, Gottingen 393, and USA 45 airfoils as obtained from tests made in the Variable Density Wind Tunnel of the NACA. The results are given at both low and high Reynolds Numbers to show scale effect and to provide data for use in airplane design.
Contributing Partner: UNT Libraries Government Documents Department
The aerodynamic wind vane and the inherent stability of airplanes

The aerodynamic wind vane and the inherent stability of airplanes

Date: February 1, 1931
Creator: Lapresle, A
Description: The design of the wind vane described rests on the following line of reasoning: An airplane, originally in equilibrium about its C.G. is assumed to be deflected from this position through an angle (delta)i, the variation (delta)i being so sudden that the path of the C.G. and the airplane speed do not change while it is taking place. The aerodynamic forces acting on the wings, tail surfaces, fuselage, etc., which, as a whole, exerted a zero moment (M(sub G) = 0) about the center of gravity at the instant of equilibrium, now exert a moment M(sub G) not equal to 0.
Contributing Partner: UNT Libraries Government Documents Department
The Amiot 140 M military airplane (French) : an all-metal multiplace high-wing monoplane

The Amiot 140 M military airplane (French) : an all-metal multiplace high-wing monoplane

Date: February 1, 1931
Creator: unknown
Description: None
Contributing Partner: UNT Libraries Government Documents Department
The behavior of conventional airplanes in situations thought to lead to most crashes

The behavior of conventional airplanes in situations thought to lead to most crashes

Date: February 1, 1931
Creator: Weick, Fred E
Description: Simple flight tests were made on ten conventional airplanes for the purpose of determining their action in the following two situations, which are generally thought to precede and lead to a large proportion of airplane crashes.
Contributing Partner: UNT Libraries Government Documents Department
Coal-Mine Fatalities in January, 1931

Coal-Mine Fatalities in January, 1931

Date: February 1931
Creator: Adams, William Waugh & Chenoweth, L.
Description: Report issued by the U.S. Bureau of Mines on the coal mine related deaths during the month of January, 1931. The number of fatalities and their causes are presented. This report includes tables.
Contributing Partner: UNT Libraries Government Documents Department
The Dewoitine D.30 commercial airplane (French) : a high-wing cantilever monoplane

The Dewoitine D.30 commercial airplane (French) : a high-wing cantilever monoplane

Date: February 1, 1931
Creator: unknown
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Flat sheet metal girders with very thin metal web. Part I : general theories and assumptions

Flat sheet metal girders with very thin metal web. Part I : general theories and assumptions

Date: February 1, 1931
Creator: Wagner, Herbert
Description: The object of this report was to develop the structural method of sheet metal girders and should for that reason be considered solely from this standpoint. The ensuing methods were based on the assumption of the infinitely low stiffness in bending of the metal web. This simplifies the basis of calculations to such an extent that many questions of great practical importance can be examined which otherwise cannot be included in any analysis of the bending stiffness of the buckled plate. This report refers to such points as the safety in buckling of uprights to the effect of bending flexibility of spars, to spars not set parallel, etc.
Contributing Partner: UNT Libraries Government Documents Department
Flat sheet metal girders with very thin metal web. Part II : sheet metal girders with spars resistant to bending - oblique uprights - stiffness

Flat sheet metal girders with very thin metal web. Part II : sheet metal girders with spars resistant to bending - oblique uprights - stiffness

Date: February 1, 1931
Creator: Wagner, Herbert
Description: Noting that the stiffness of the girder increases very rapidly as Beta increases, the result can be summed up as follows: When the cross stress preponderates in one direction and when the web plate is to be given the dimensions commensurate to its stresses, it is advisable (regardless of any ensuing structural difficulties) to set the uprights at about Beta = 120 degrees, thereby lowering the weight of the plate wall 15 percent (in contrast to Beta = 90 degrees), and raising the stiffness 55 percent. But, when the cross stresses alternate and are approximately of the same intensity in both directions, or, if the web plate thickness is determined by other structural reasons, then Beta = 90 degrees should be chosen.
Contributing Partner: UNT Libraries Government Documents Department
Flat sheet metal girders with very thin metal web. Part III : sheet metal girders with spars resistant to bending - the stress in uprights - diagonal tension fields

Flat sheet metal girders with very thin metal web. Part III : sheet metal girders with spars resistant to bending - the stress in uprights - diagonal tension fields

Date: February 1, 1931
Creator: Wagner, Herbert
Description: This report continues the work presented in NACA-TM 605 and expands the scope to include the change in specific number of wrinkles from direction x to z, so that b and f become variable in direction z. Moreover, it seems likely that b and f increase from the edge toward the center if the sheet is infinitely thin.
Contributing Partner: UNT Libraries Government Documents Department
Interference effects and drag of struts on a monoplane wing

Interference effects and drag of struts on a monoplane wing

Date: February 1, 1931
Creator: Ward, Kenneth E
Description: Tests were conducted in the Variable Density Wind Tunnel of the NACA to determine the importance of the interference effects and drag of struts on a monoplane. Inclined struts were placed upon a Gottingen 387 airfoil in the lower surface positions and in two upper surface positions. Tests were made at values of Reynolds Number comparable with those obtained in flight. It was found that the interference drag of struts may be as great as the drag of the struts alone.
Contributing Partner: UNT Libraries Government Documents Department