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 Decade: 1940-1949
 Year: 1948
 Collection: National Advisory Committee for Aeronautics Collection
Lifting-surface-theory aspect-ratio corrections to the lift and hinge-moment parameters for full-span elevators on horizontal tail surfaces

Lifting-surface-theory aspect-ratio corrections to the lift and hinge-moment parameters for full-span elevators on horizontal tail surfaces

Date: January 1, 1948
Creator: Crandall, Stewart M & Swanson, Robert S
Description: A limited number of lifting-surface-theory solutions for wings with chordwise loadings resulting from angle of attack, parabolic-ac camber, and flap deflection are now available. These solutions were studied with the purpose of determining methods of extrapolating the results in such a way that they could be used to determine lifting-surface-theory values of the aspect-ratio corrections to the lift and hinge-moment parameters for both angle-of-attack and flap-deflection-type loading that could be used to predict the characteristics of horizontal tail surfaces from section data with sufficient accuracy for engineering purposes. Such a method was devised for horizontal tail surfaces with full-span elevators. In spite of the fact that the theory involved is rather complex, the method is simple to apply and may be applied without any knowledge of lifting-surface theory. A comparison of experimental finite-span and section value and of the estimated values of the lift and hinge-moment parameters for three horizontal tail surfaces was made to provide an experimental verification of the method suggested. (author).
Contributing Partner: UNT Libraries Government Documents Department
The effects of fuel sloshing on the lateral stability of a free-flying airplane model

The effects of fuel sloshing on the lateral stability of a free-flying airplane model

Date: June 29, 1948
Creator: Smith, Charles C., Jr.
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Experiments on stability of Bunsen-burner flames for turbulent flow

Experiments on stability of Bunsen-burner flames for turbulent flow

Date: January 1, 1948
Creator: Bollinger, Lowell M
Description: The results of a study of the stability of propane-air flames on bunsen-burner tubes are presented. Fuel-air ratio, tube diameter, and Reynolds number were the primary variables. Regions of stability are outlined in plots of fuel-air ratio as a function of Reynolds number for flames seated on the burner lip and for flames suspended well above the burner. For fully developed flow, turbulent as well as laminar, the velocity gradient at the burner wall is a satisfactory variable for correlating the fuel-air ratio required for blow-off of seated flames for fuel-air ratios of less than 15 percent. For turbulent flames, wall velocity serves as a correlating variable in the same fuel-air-ratio range. (author).
Contributing Partner: UNT Libraries Government Documents Department
A unified theory of plastic buckling of columns and plates

A unified theory of plastic buckling of columns and plates

Date: January 1, 1948
Creator: Stowell, Elbridge Z
Description: On the basis of modern plasticity considerations, a unified theory of plastic buckling applicable to both columns and plates has been developed. For uniform compression, the theory shows that long columns which bend without appreciable twisting require the tangent modulus and that long flanges which twist without appreciable bending require the secant modulus. Structures that both bend and twist when they buckle require a modulus which is a combination of the secant modulus and the tangent modulus.
Contributing Partner: UNT Libraries Government Documents Department
Accuracy of airspeed measurements and flight calibration procedures

Accuracy of airspeed measurements and flight calibration procedures

Date: January 1, 1948
Creator: Huston, Wilber B
Description: The sources of error that may enter into the measurement of airspeed by pitot-static methods are reviewed in detail together with methods of flight calibration of airspeed installations. Special attention is given to the problem of accurate measurements of airspeed under conditions of high speed and maneuverability required of military airplanes. (author).
Contributing Partner: UNT Libraries Government Documents Department
Investigation of a variable Mach number supersonic tunnel with nonintersecting characteristics

Investigation of a variable Mach number supersonic tunnel with nonintersecting characteristics

Date: November 15, 1948
Creator: Evvard, John C
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Preliminary investigation of effects of combustion in ram jet on performance of supersonic diffusers III : normal-shock diffuser

Preliminary investigation of effects of combustion in ram jet on performance of supersonic diffusers III : normal-shock diffuser

Date: December 22, 1948
Creator: Schroeder, Albert H
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Aerodynamic characteristics of two all-movable wings tested in the presence of a fuselage at a Mach number of 1.9

Aerodynamic characteristics of two all-movable wings tested in the presence of a fuselage at a Mach number of 1.9

Date: October 28, 1948
Creator: Conner, D William
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Determination of average heat-transfer coefficients for a cascade of symmetrical impulse turbine blades I : heat transfer from blades to cold air

Determination of average heat-transfer coefficients for a cascade of symmetrical impulse turbine blades I : heat transfer from blades to cold air

Date: November 10, 1948
Creator: Meyer, Gene L
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Investigation of effects of movable exhaust-nozzle plug on operational performance of 20-inch ram jet

Investigation of effects of movable exhaust-nozzle plug on operational performance of 20-inch ram jet

Date: July 27, 1948
Creator: Sterbentz, William H
Description: None
Contributing Partner: UNT Libraries Government Documents Department
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