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Further Measurements of Normal Accelerations on Racing Airplanes
This report details the acceleration data collected from racing airplanes during actual races. The data was collected in order to make recommendations regarding the structural safety of racing airplanes and the methods of operating racing airplanes that reduces the probability of subjecting them to extreme air loads. The records do not lead to any conclusions regarding maximum air loads.
Date:
February 1936
Creator:
Kirschbaum, H. W. & Scudder, N. F.
System:
The UNT Digital Library
The Buckling of Parallel Simply Supported Tension and Compression Members Connected by Elastic Deflectional Springs
Note presenting an investigation of the problem of the buckling of parallel simply supported tension and compression members connected by equally stiff and equally spaced elastic deflection springs as an approximation to the problem of the effect of finite stiffness of ribs and tension surface on the buckling load of the compression surface of a wing. Charts relating compressive buckling load, deflectional spring stiffness, and the ratio of the flexural stiffness of the members are given for tension and compression members with various numbers of spans.
Date:
February 1949
Creator:
Seide, Paul & Eppler, John F.
System:
The UNT Digital Library
Effect of Centrifugal Force on the Elastic Curve of a Vibrating Cantilever Beam
Report presenting the results of a study to determine the effect of rotation on the dynamic-stress distribution in vibrating cantilever beams. Both theoretical and experimental results are obtained by means of stroboscopic photographs and strain gauges. Both types of results indicated that the introduction of centrifugal force had no effect on the maximum dynamic-stress locations in a vibrating cantilever beam fixed at the center of rotation within the investigated speed range.
Date:
February 1947
Creator:
Simpkinson, Scott H.; Eatherton, Laurel J. & Millenson, Morton B.
System:
The UNT Digital Library
An investigation of the aerodynamic characteristics of a rotating axial-flow blade grid
Report presenting the results of an experimental investigation of the aerodynamic characteristics of a rotating axial-flow blade grid with pressure-increasing effect. Several techniques of measurement were used, including pressure distribution measurements, pitot tubes, and hot wire wake surveys. Results regarding the lift and pressure drag of the blade sections, aerodynamic characteristics of the blade sections, profile drag, and static pressure are provided.
Date:
February 1947
Creator:
Weske, John R.
System:
The UNT Digital Library
Pressure Distributions for Representative Airfoils and Related Profiles
Note presenting selected pressure-distribution diagrams for a number of conventional and special airfoils. The conventional airfoils include the NACA 22, 44, and 230 series airfoils and Clark Y family and the special airfoils consist of circular-arc sections of several thicknesses and a number of synthetic airfoils. The pressure distributions are in most cases given for several lift coefficients including that at the ideal angle of attack.
Date:
February 1946
Creator:
Theodorsen, Theodore & Naiman, Irven
System:
The UNT Digital Library
Foaming Volume and Foam Stability
"A method of measuring foaming volume is described and investigated to establish the critical factors in its operation. Data on foaming volumes and foam stabilities are given for a series of hydrocarbons and for a range of concentrations of aqueous ethylene-glycol solutions. It is shown that the amount of foam formed depends on the machinery of its production as well as on properties of the liquid, whereas the stability of the foam produced, within specified mechanical limitations, is primarily a function of the liquid" (p. 1).
Date:
February 1947
Creator:
Ross, Sydney
System:
The UNT Digital Library
Flight Measurements of the Lateral Control Characteristics of Narrow-Chord Ailerons on the Trailing Edge of a Full-Span Slotted Flap
Note presenting results of flight tests made to determine the effect of flap deflection on the lateral control characteristics of a modified Brewster F2A-2 airplane equipped with partial-span narrow-chord ailerons on the trailing edge of a full-span NACA slotted flap. The results indicated that the effectiveness of the ailerons was greatly reduced at flap deflections greater than about 20 degrees.
Date:
February 1947
Creator:
Sawyer, Richard H.
System:
The UNT Digital Library
A Comparison of the Lateral Motion Calculated for Tailless and Conventional Airplanes
Theoretical analysts of lateral dynamic motion of tailless and conventional airplanes was made for fighter and heavy transport. Their reactions to a lateral gust and control power required by each for simple maneuvers were determined and compared. Both types of airplanes require almost identical aileron control power to perform a given maneuver; tailless airplane requires about 1-2 to 1-3 directional control power of conventional airplane. Tailless airplane also shows greatest displacement for a given disturbance and has least damping in oscillatory mode.
Date:
February 1947
Creator:
Harper, Charles W. & Jones, Arthur L.
System:
The UNT Digital Library
Effects of Partial Admission on Performance of a Gas Turbine
Report presenting an investigation of the effect of partial admission of the driving fluid on the performance of a representative full-admission, production-type gas turbine. Results regarding losses, full-admission performance, partial-admission performance, partial admission as a means of power control, and a comparison of partial admission with other methods of power control are provided.
Date:
February 1949
Creator:
Kohl, Robert C.; Herzig, Howard Z. & Whitney, Warren J.
System:
The UNT Digital Library
Method for Evaluating From Shadow or Schlieren Photographs the Pressure Drag in Two-Dimensional or Axially Symmetrical Flow Phenomena With Detached Shock
"A method has been developed for evaluating from shadow or schileren photographs the pressure drag of axially symmetrical bodies at zero angle of attack or of two-dimensional bodies producing detached shock. The method consists in the determination of the flow properties along a characteristic line and the application of the momentum theorem to a stream tube around the body. The method can be applied to the determination of external drag of supersonic inlets with subsonic flow at the entrance of the inlet" (p. 1).
Date:
February 1949
Creator:
Ferri, Antonio
System:
The UNT Digital Library
The application of airfoil studies to helicopter rotor design
From Summary: "In order to facilitate the application of miscellaneous airfoil data to the problems of the helicopter designer, a discussion of a number of the problems most frequently arising is presented. A reference list of published papers on airfoil section characteristics (or their application) which experience has shown to be useful in connection with these helicopter problems is included."
Date:
February 1949
Creator:
Gustafson, F. B.
System:
The UNT Digital Library
A study of flow changes associated with airfoil section drag rise at supercritical speeds
Report presenting a study of experimental pressure distributions and section characteristics for several moderately thick airfoil sections were made. The pressure distributions and section force characteristics of several moderately thick airfoil sections at Mach numbers above the drag-divergence Mach numbers were analyzed.
Date:
February 1949
Creator:
Nitzberg, Gerald E. & Crandall, Stewart
System:
The UNT Digital Library
Effects of Several Design Variables on Turbine-Wheel Weight
Report presenting an analysis showing the effect of several design variables on turbine-wheel flight. Equations are developed for the calculations of weights of the disk, the rim, and the blades, and use the following variables: the blading aspect ratio and solidity, the ratio of the centrifugal stress at the blade roots to that in the disk, and the ratio of wheel diameter at the blade root to wheel diameter at the blade tip.
Date:
February 1949
Creator:
LaValle, Vincent L. & Huppert, Merle C.
System:
The UNT Digital Library
Performance of axial-flow fan and compressor blades designed for high loadings
Report presenting an investigation to determine the effects of loading on the performance of axial-flow fan and compressor blades in a test blower. Results regarding verification of the two-dimensional design data and effects of blade roughness are provided.
Date:
February 1947
Creator:
Bogdonoff, Seymour M. & Herrig, L. Joseph
System:
The UNT Digital Library
On Compressibility Corrections for Subsonic Flow Over Bodies of Revolution
"A study of the subsonic flow past an infinitely long corrugated circular cylinder is presented to show the relation between two-dimensional and axisymmetrical flow. In fact, a solution is obtained which contains as limiting cases both the Prandtl-Glauert correction for two-dimensional flow and the Göthert correction for flow past slender bodies of revolution. Included in the paper are velocity-correction formulas for a cylinder with a single bump and for a corrugated cylinder in the presence of walls" (p. 1).
Date:
February 1949
Creator:
Reissner, Eric
System:
The UNT Digital Library
Triangular wings cambered and twisted to support specified distributions of lift at supersonic speeds
Report presenting an application of the linearized supersonic flow theory to the calculation of the camber and twist required for various lift distributions on a triangular wing with leading edges behind the Mach cone. Several specific examples are used and plots of the cambered surfaces, corresponding lift distributions, and values of the theoretical drag coefficients are presented.
Date:
February 1949
Creator:
Baldwin, Barrett S., Jr.
System:
The UNT Digital Library
In-line aircraft-engine bearing loads 3: main-bearing loads
Report presenting the application of dimensional analysis to the computation of the main bearing of a V-type in-line aircraft engine. Two crankshafts have been considered, one designed for higher operating speed than the other. Two types of engines are considered: one for regular V-type engines and one for production V-type engines.
Date:
February 1947
Creator:
Shaw, Milton C. & Macks, E. Fred
System:
The UNT Digital Library
The Response of Pressure Measuring Systems to Oscillating Pressures
Note presenting a method for calculating the response and lag in pressure measuring systems subjected to steady-state sinusoidally varying pressures. The pressure system is assumed to consist of an inlet restriction, tubing length, and connected instrument volume. Results of the phase-shift determination are provided.
Date:
February 1949
Creator:
Taback, Israel
System:
The UNT Digital Library
The synthesis of methylenecyclobutane, spiropentane, and 2-methyl-1-butene from pentaerythrityl tetrabromide
From Summary: "Reduction of pentaerythrityl tetrabromide in ethanol with zinc in the presence of sodium carbonate and sodium iodide was found to yield methylenecyclobutane, spiropentane, and 2-methyl-l-butene. Yields were 46 percent methylenecyclobutane, 21 percent spiropentane, and 12 percent 2-methyl-l-butene. The reduction procedure described offers a method of preparing both methylenecyclobutane and spiropentane from the same reaction in yields comparable with individual methods of synthesis previously reported."
Date:
February 1946
Creator:
Slabey, Vernon A.
System:
The UNT Digital Library
Methods for obtaining desired helicopter stability characteristics and procedures for stability predictions
A report in two parts: one is a brief review of methods available to helicopter designers for obtaining desired stability characteristics by modifying airframe design and the other is a review of some of the methods of predicting rotor stability derivatives.
Date:
February 1957
Creator:
Gustafson, F. B. & Tapscott, Robert J.
System:
The UNT Digital Library
Ditching investigations of dynamic models and effects of design parameters on ditching characteristics
From Summary: "Data from ditching investigations conducted at the Langley Aeronautical Laboratory with dynamic scale models of various airplanes are presented in the form of tables. The effects of design parameters on the ditching characteristics of airplanes, based on scale-model investigations and on reports of full-scale ditchings, are discussed. Various ditching aids are also discussed as a means of improving ditching behavior."
Date:
February 1957
Creator:
Fisher, Lloyd J. & Hoffman, Edward L.
System:
The UNT Digital Library
Coincidence Method Applied to Ion Beam Measurement
"A coincidence Geiger counter system was constructed for the absolute measurement of the activity of radioactive substances made in a cyclotron. The average beam current in the cyclotron can be calculated from the number of disintegrations per second observed, the half-life of the radioactive substance, and the reaction cross section" (p. 1).
Date:
February 1952
Creator:
Fultz, Stanley & Pool, M. L.
System:
The UNT Digital Library
Bonding of molybdenum disulfide to various materials to form a solid lubricating film 1: the bonding mechanism
Report presenting the use of molybdenum disulfide as a solid film lubricant in applications where designs or temperatures preclude liquid lubricants is dependent on successful bonding of the powder to the surface to be lubricated. An investigation was conducted to determine the basic mechanism of bonding and to extend application of the bonding to a variety of materials. Results regarding an examination of electron diffraction of MoS2 dusted and rubbed on steel, adherence of dry powders to metals, chemical action in bonding mechanism, other resin-forming liquid vehicles, bonding of MoS2 and other powders to various materials, and analysis of solid film by electron diffraction are provided.
Date:
February 1952
Creator:
Godfrey, Douglas & Bisson, Edmond E.
System:
The UNT Digital Library
Effect of Frequency and Temperature on Fatigue of Metals
Note presenting a qualitative approach to the problem of the effect of frequency and temperature on fatigue, as the theoretical and experimental results do not always seem to match. The fatigue problem is examined from the viewpoint of a two-component system.
Date:
February 1957
Creator:
Valluri, S. R.
System:
The UNT Digital Library