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The critical velocity of a body towed by a cable from an airplane
It is sufficient to consider only the equations of motion of the towed body whereas those of the cable may be left out of consideration. The result obtained makes it possible to determine which factors affect the critical velocity and what modifications of the instrument are necessary for extending the upper limit of that velocity.
Date:
July 1937
Creator:
Koning, C. & DeHaas, T. P.
System:
The UNT Digital Library
The Vortex Theory and Its Significance in Aviation
This report will present ideas closely related to the vortex conception and illustrate them in the simplest possible terms. In addition to these general considerations, this report will attempt to show the application of the vortex theory in connection with the wing theory.
Date:
July 1930
Creator:
Betz, A.
System:
The UNT Digital Library
Development of Light and Small Airplanes
Memorandum presenting an overview of the development of light and small airplanes. Some of the characteristics explored include the development of airplanes of medium weight, development in countries other than Germany, development of light airplanes, general constructive fiducial lines, safety problems, the economy problem, and some special structural considerations are provided.
Date:
July 1926
Creator:
Lachmann, G.
System:
The UNT Digital Library
Investigation of the Variations in the Velocity of the Air Flow About a Wing Profile
Memorandum presenting an investigation to determine the variations in the velocity of the air when it was obliged to flow about a wing profile. Special interest was paid to the determination of velocity as compared with that of the undisturbed flow and of the velocity drop in successive planes perpendicular to the flow direction at increasing distances from the wing profile.
Date:
July 1930
Creator:
Repenthin, Walter
System:
The UNT Digital Library
Velocity and Pressure Distribution Behind Bodies in an Air Current
The following experiments on the air flow behind bodies were made for the purpose of assisting in the explanation of the phenomena connected with air resistance. The first two series of experiments dealt with the phenomena behind a cylinder. The third series of experiments was carried out behind a streamlined strut.
Date:
July 1924
Creator:
Betz, A.
System:
The UNT Digital Library
On the Knocking of Gasoline Engines
Report presenting an investigation of the phenomenon of knocking in gasoline engines and some of the problems that it may cause. It is of the greatest importance, not only for automobile engines, but also for every other kind of internal combustion engine, since it limits the degree of compression and the thermal efficiency and its investigation indicates ways for saving fuel.
Date:
July 1926
Creator:
Richter, Ludwig
System:
The UNT Digital Library
The Drawing of Experimental Curves
This report presents a discussion of how to determine the location of a line or surface from experimental data. What we desire to know practically is the number of ordinates required to obtain a certain probable precision in drawing a line or surface.
Date:
July 1921
Creator:
Norton, F. H.
System:
The UNT Digital Library
Fire Prevention on Aircraft
The following discussion is at first restricted to the light-oil engines now in use. We shall consider how far it is possible to reduce fire hazards by changes in the design of the engines and carburetors and in the arrangement of the fuel pipes.
Date:
July 1931
Creator:
Kühn, Fritz
System:
The UNT Digital Library
Autogenous Welding in Airplane Construction
Autogenous welding is discussed and various methods of testing those welds are presented.
Date:
July 1929
Creator:
Kuchel, Ludwig
System:
The UNT Digital Library
Impact Tests on Rubber Compression Springs for Airplane Landing Gears
The present report gives the results of tests which were made for the purpose of solving the problem of whether diagrams obtained from pressure tests could be conclusive for the determination of the safe impact coefficients. It is first established that the rubber rings adhere firmly to the compression surfaces during deformation. Suggestions are thus obtained for a constructive simplification of the rubber rings. The hysteresis phenomenon is ascribed to external and internal friction forces. A device for falling tests is then described with which the process of shock absorption with rubber rings was tested.
Date:
July 1930
Creator:
Hohenemser, K.
System:
The UNT Digital Library
Experiments on the Resistance of Airplane Wheels and Radiators
Experiments were made on the resistance of four airplane wheels of different sizes and coverings and two Lamblin radiators. The results show the important influence of the wheel coverings. The closing of a shutter, which was fitted to one of the radiators, considerably lessened the resistance.
Date:
July 1924
Creator:
unknown
System:
The UNT Digital Library
The Dangerous Flat Spin and the Factors Affecting It
This report deals first with the fundamental data required for the investigation. These are chiefly the aerodynamic forces and moments acting on an airplane in a flat spin. It is shown that these forces and moments depend principally on the angle of attack and on the rotation about the path axis, and can therefore either be measured in a wind tunnel or calculated from wind-tunnel measurements of lift, drag and moment about the leading edge of the wing of an airplane model at rest.
Date:
July 1931
Creator:
Fuchs, Richard & Schmidt, Wilhelm
System:
The UNT Digital Library
Correction of Downwash in Wind Tunnels of Circular and Elliptic Sections
The downwash velocity distribution behind the wing was determined for the free jet and for the closed tunnel of both circular and elliptic cross sections. The wing was placed at the center of the tunnel. The theory makes it possible to determine the downwash at any point in the jet. The computations were performed for points in the plane determined by the jet axis and the center-of-pressure line of the wing.
Date:
July 1936
Creator:
Lotz, Irmgard
System:
The UNT Digital Library
The Problem of Noise in Civil Aircraft and the Possibilities of Its Elimination
The problem of noise in aircraft is considered and some solutions are presented. The primary sources of sound explored included the engine and the propeller and some ways of insulating passengers from the noise are provided.
Date:
July 1928
Creator:
Tucker, W. S.
System:
The UNT Digital Library
Variable Pitch Propeller
The advantages of variable pitch propellers over constant pitch propellers is presented along with different methods of varying the pitch. The technique of varying the shape of the propeller is presented as the most efficient one.
Date:
July 1923
Creator:
Pistolesi, Enrico
System:
The UNT Digital Library
Control Operating Mechanisms for Airplanes
The connections between the cockpit and the control surfaces are examined. An examination of the pros and cons of using stick control, the problems of control in giant aircraft, an effort to find a substitute for these controls, and a proposed concept for mechanically operated gear are provided.
Date:
July 1923
Creator:
Warner, Edward P.
System:
The UNT Digital Library
The "Autogiro"
Report presenting a description of the autogiro, which is a flying machine built and designed in Spain. A history of the device and the reasons why it is safer and more stable than a typical aircraft are provided.
Date:
July 1923
Creator:
Moreno-Caracciolo, M.
System:
The UNT Digital Library
Control Problems on Large Airplanes
The development of more efficient control surfaces requiring less force to operate are presented. Some of the control surfaces explored include the De Havilland gear, Flettner rudder, and some other possible control methods.
Date:
July 1923
Creator:
Warner, Edward P.
System:
The UNT Digital Library
The Stresses in Columns Under Combined Axial and Side Loads
The problem before us is to determine the total stresses in an axially loaded column of any degree of restraint which is also subject to transverse bending both from a uniformly distributed load and from concentrated loads. The solution of this problem is of special importance in the design of aircraft which consist of slender columns" (p. 1).
Date:
July 1922
Creator:
Arnstein, Karl & Truscott, Starr
System:
The UNT Digital Library
Aerodynamics and Ballistics
Ballistics is a science hundreds of years old and this report is an attempt to show how these older principles can be used in the newer science of aerodynamics.
Date:
July 1922
Creator:
Burzio, Filippo
System:
The UNT Digital Library
Politics of Aviation Fields
In short, the "politics of aviation" lies in a few propositions: the need of having as large a number of fields as possible and of sufficient area; the utilization of the larger part of the existing military fields; the selection of uncultivated or unproductive fields, whenever technical conditions permit; ability to disregard (save in exceptional cases) objections of an agricultural nature.
Date:
July 23, 1922
Creator:
Vivent, Jacques
System:
The UNT Digital Library
Aviation in the Belgian Congo
The establishment of air service in the Belgian Congo is detailed in this report. The airplanes, landing fields, and air routes are all discussed.
Date:
July 1922
Creator:
van Crombrugge, A.
System:
The UNT Digital Library
European Air Travel in 1922
This article discusses the different passenger air transport services offered in Europe. The author deals mainly with the service offered between different cities, in terms of time and cost.
Date:
July 1922
Creator:
Warner, Edward P.
System:
The UNT Digital Library
Airplane Stability Calculations and Their Verification by Flight Tests
For some time, the designers of airplanes have begun to occupy themselves with the question of longitudinal stability. In their quest to simplify calculation and data collection, the designers have attached the greatest importance to the coefficient of initial longitudinal stability. In this study a diagram was constructed from the data of the tunnel tests, which depends neither on the position of the center of gravity nor of the angle of deflection of the elevators. This diagram is constructed by means of straight lines drawn through the metacenters of the complete airplane, in a direction parallel to the tangents to the polar of the airplane relative to a system of axes fixed with reference to the airplane.
Date:
July 1922
Creator:
Rota, Augusto
System:
The UNT Digital Library