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The Theory of a Free Jet of a Compressible Gas
"In the present report the theory of free turbulence propagation and the boundary layer theory are developed for a plane-parallel free stream of a compressible fluid. In constructing the theory use was made of the turbulence hypothesis by Taylor (transport of vorticity) which gives best agreement with test results for problems involving heat transfer in free jets" (p. 1).
Date:
March 1944
Creator:
Abramovich, G. N.
System:
The UNT Digital Library
Formation of a Vortex at the Edge of a Plate
The flow about the plate of infinite width may be represented as a potential flow with discontinuity surfaces which extend from the plate edges. On the basis of a similitude requirement one succeeds in finding a solution of this problem for the plate of infinite width which is correct for the very beginning of the motion of the fluid. Starting from this solution, the further development of the vortex distribution and shape of the surface are observed in the case of a plate of finite width.
Date:
March 1956
Creator:
Anton, Leo
System:
The UNT Digital Library
Some Principles Governing the Establishment of Meteorological Stations Along Air Routes
The organization of a meteorological service for an air route involves the solution of two distinct problems: distribution and grouping of meteorological stations and communications. Experience gained in the establishment of two lines, Paris-Warsaw and Constantinople-Bucharest enables us to establish certain principles, which may be of interest to note here.
Date:
March 1922
Creator:
Aujames, P.
System:
The UNT Digital Library
The "Universal Propeller": Built by Paragon Engineers, Inc., Baltimore, MD.
At the request of the N.A.C.A. the "Universal Propeller" was operated and explained by the inventor, Mr. Spencer Heath, for the purpose of demonstrating the following features of design: 1) Elimination of continuously running gears, collars or bearings in the pitch control mechanism; 2) The use of engine power in place of manual labor in changing blade angle; 3) The absence of any structural limitation to the range of blade angles available and the possibility of limiting the blade travel between any two predetermined extreme positions; 4) Continuous indication on the instrument board of the blade position; 5) Automatic throttling of the engine while the propeller is passing through the position of neutral pitch.
Date:
March 1922
Creator:
Bacon, David L.
System:
The UNT Digital Library
Evolution of the Helicopter
Report presenting an investigation of problems related to helicopters. Also included are the history of the evolution of the helicopter and a series of propeller experiments.
Date:
March 1923
Creator:
Balaban, Karl
System:
The UNT Digital Library
Atmospheric Waves and Their Utilization in Soaring Flight
In soaring flight, ascending air currents are utilized and the interesting question is raised whether there are such currents which extend to any considerable distance and which can be utilized practically.
Date:
March 1923
Creator:
Baldit, M. Albert
System:
The UNT Digital Library
Impact Waves and Detonation: Part 1
"Among the numerous thermodynamic and kinetic problems that have arisen in the application of the gaseous explosive reaction as a source of power in the internal combustion engine, the problem of the mode or way by which the transformation proceeds and the rate at which the heat energy is delivered to the working fluid became very early in the engine's development a problem of prime importance. The work of Becker here given is a notable extension of earlier investigations, because it covers the entire range of the explosive reaction in gases - normal detonation and burning" (p. i).
Date:
March 1929
Creator:
Becker, R.
System:
The UNT Digital Library
Impact Waves and Detonation: Part 2
A continuation of a previous technical memorandum regarding impact waves and detonation. This particular report focuses on the applications to detonation under several different conditions, including variations in pressure.
Date:
March 1929
Creator:
Becker, R.
System:
The UNT Digital Library
On the Buckling of Bars and Plates in the Plastic Range: Part 2
A review is made of existing literature concerning comparison with experiment of various theoretical formulas for buckling of plates in the plastic region. The significance and relative merits of various theories are discussed.
Date:
March 1956
Creator:
Benthem, J. P.
System:
The UNT Digital Library
Modification of Wing-Section Shape to Assure a Predetermined Change in Pressure Distribution
"In order to find an airfoil for a predetermined pressure distribution, the problem must be posed so that the pressure distribution creates no drag. Another fundamental difficulty is that it is impossible to specify a pressure distribution without first knowing the place where these pressures are to be applied, i.e., the wing-section shape. This difficulty may be avoided by directing the pressure distribution along the contour of the wing section. Then it becomes possible to define the change in wing-section shape which effects a certain modification of the wing-section shape" (p. 1).
Date:
March 1935
Creator:
Betz, A.
System:
The UNT Digital Library
Problems Concerning the Stability and Maneuverability of Airplanes
"The stability of an airplane can be easily determined by wind-tunnel tests, especially by simple tests with models mounted wind-vane fashion. However, each stability curve plotted by this method is valid only for a certain setting of the corresponding control surface, i.e., it characterizes the stability of the airplane with the control stick in a given position. The problems thus defined are studied from the point of view of longitudinal and transverse stability. Directional stability is not included in this study" (p. 1).
Date:
March 1932
Creator:
Biche, Jean
System:
The UNT Digital Library
Mechanical Control of Airplanes
"Before undertaking a detailed description of an automatic-control mechanism, I will state briefly the fundamental conditions for such devices. These are: 1) it must be sensitive at one or more reference values; 2) it must stop the angular motions of the airplane not produced by the pilot; and 3) it must be possible to switch it off and on by a simple hand lever" (p. 1).
Date:
March 1929
Creator:
Boykow, H.
System:
The UNT Digital Library
Note on Research Work by Helmholtz and Wien Relating to the Form of Waves Propagated Along the Surface of Separation of Two Liquids
This report presents a clearer understanding of Helmholtz's work on the calculation of waves along the separation of two different liquids.
Date:
March 1928
Creator:
Burgers, J. M.
System:
The UNT Digital Library
Infinitesimal Conical Supersonic Flow
The calculation of infinitesimal conical supersonic flow has been applied first to the simplest examples that have also been calculated in another way. Except for the discovery of a miscalculation in an older report, there was found the expected conformity. The new method of calculation is limited more definitely to the conical case.
Date:
March 1947
Creator:
Busemann, Adolf
System:
The UNT Digital Library
On the Gas Dynamics of a Rotating Impeller
It is shown that for a compressible flow with constant entropy the pressure rise maintains the direct relation to the circulation around the blades existing for incompressible flow. In contrast, however, the torque, and with it the power consumption, is increased because of sound waves traveling to infinity already at subsonic circumferential speeds.
Date:
March 1956
Creator:
Busemann, Adolf
System:
The UNT Digital Library
The Shock-Absorbed System of the Airplane Landing Gear
"A discussion is given of the behavior of the shock-absorbing system, consisting of elastic struts and tires, under landing, take-off, and taxying conditions, and a general formula derived for obtaining the minimum stroke required to satisfy the conditions imposed on the landing gear. Finally, the operation of some typical shock-absorbing systems are examined and the necessity brought out for taking into account, in dynamic landing-gear tests, the effect of the wing lift at the instant of contact with the ground" (p. 1).
Date:
March 1940
Creator:
Callerio, Pietro
System:
The UNT Digital Library
Analytical Theory of the Campini Propulsion System
"The present report deals exclusively with the particular jet-propulsion system mentioned in the cited reports. The discussion is limited, for the present, to the analytical study of the efficiency and the consumption for the case of application to aircraft and to the plotting of the practical operating curves secured theoretically by the use of suitable experimental factors" (p. 1).
Date:
March 1942
Creator:
Campini, S.
System:
The UNT Digital Library
Differential Equations in Airplane Mechanics
In the following report, we will first draw some conclusions of purely theoretical interest, from the general equations of motion. At the end, we will consider the motion of an airplane, with the engine dead and with the assumption that the angle of attack remains constant. Thus we arrive at a simple result, which can be rendered practically utilizable for determining the trajectory of an airplane descending at a constant steering angle.
Date:
March 1922
Creator:
Carleman, M. T.
System:
The UNT Digital Library
Publicity by Airplane
The future of aerial photography is examined with special reference to corporate uses.
Date:
March 1922
Creator:
Carlier, André
System:
The UNT Digital Library
The Bending of Beams With Thin Tension Flanges
This report analyzes the action of a cantilever T beam with a tension flange so thin it can only carry tensile stresses.
Date:
March 1935
Creator:
Cicala, Placido
System:
The UNT Digital Library
The Practical Difficulties of Commercial Flying
This paper relates some of the problems commercial aircraft companies have in attracting larger numbers of paying customers. The author discusses some remedies such as changing the public perception of flying as dangerous.
Date:
March 1924
Creator:
Courtney, F. T.
System:
The UNT Digital Library
Systematic airfoil tests in the large wind tunnel of the DVL
The present report is a description of systematic tests at maximum lift on airfoils with and without split flap and of profile drag at low lift. In order to obtain an opinion as to the suitability of the airfoils with flaps, the maximum-lift measurements were repeated on airfoils with split flaps. The profile drag at low lift was arrived at by direct weighing and momentum measurements and, since the profiles were of unusual depth, extended to large Reynolds numbers.
Date:
March 1938
Creator:
Doetsch, H. & Kramer, M.
System:
The UNT Digital Library
A Flat Wing With Sharp Edges in a Supersonic Stream
A basic treatment is given for the approximate solution of the problem of two-dimensional supersonic flow past a thin wing at small angles of attack. The pressure distribution at the surface, the lifting force, and the wave drag are determined.
Date:
March 1956
Creator:
Donov, A. E.
System:
The UNT Digital Library
Maps and Navigation Methods
Different maps and scales are discussed with particular emphasis on their use in aviation. The author makes the observation that current navigation methods are slow and dangerous and should be replaced by scientific methods of navigation based on loxodromy and the use of the compass.
Date:
March 1922
Creator:
Duval, A.
System:
The UNT Digital Library