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The vector ruling protractor
The theory, structure and working of a vector slide rule is presented in this report. This instrument is used for determining a vector in magnitude and position when given its components and its moment about a point in their plane.
Date:
March 1924
Creator:
Zahm, A. F.
System:
The UNT Digital Library
Concrete Airship Sheds at Orly, France Part 1: General Aspect of the Problem, Basic Principles of the Final Project, Principal Structural Elements
This report details the contest to design and build concrete airship hangers. The difficulty lies in the magnitude of the absolute dimensions. An airship shed must withstand two principal types of stresses: those resulting from its own weight and those due to the wind. This report discusses both problems in detail.
Date:
October 1925
Creator:
Freyssinet
System:
The UNT Digital Library
Report on Commercial Air Transportation Activities in England, France, Germany and Holland
The following pages present a review of the air transportation activities of England, France, Germany and Holland, based on an inspection trip during the summer of 1924. The different components described include operating companies, nature of transportation services, air traffic, flying equipment, government relations, and general remarks.
Date:
June 1925
Creator:
Van Zandt, J. Parker
System:
The UNT Digital Library
Wood Versus Metal in Airplane Construction
The aim of this article is to present, in broad outline, a scientific method for solving the problem, "Wood or Metal." It will be shown that structural methods have by no means reached their final perfection. The strength of the different materials is discussed as well as different construction methods.
Date:
June 1923
Creator:
Seehase, H.
System:
The UNT Digital Library
Relation Between the Stability Characteristics and the Controllability of German Airplanes
This survey is intended to give a general approximate idea of the stability and controllability of German airplanes. Both flight characteristics, including the behavior of the airplane under the action of deflected controls and external disturbances, and flight performance, which refers to climbing, speed, take-off, and landing qualities.
Date:
February 1930
Creator:
Hübner, Walter
System:
The UNT Digital Library
Experimental Investigations Concerning the Limits of Detonation in Gaseous Mixtures: Part 1
Memorandum presenting an investigation to determine quantitatively the limits of detonation in gaseous mixtures for the conditions imposed and for a number of given gaseous explosive mixtures.
Date:
February 1930
Creator:
Wendlandt, Rudolf
System:
The UNT Digital Library
"Gloster" Metal Construction
This report details the methods of construction employed by the Gloster Company in their fabrication of metal aircraft parts. Ribs, spars, wings, and metal treatments to prevent oxidation are all discussed.
Date:
June 1930
Creator:
unknown
System:
The UNT Digital Library
Force Measurements on Airplanes
The most essential phenomena of aircraft should be classified according to their origin and then measured. Information can thus be obtained in a quicker, cheaper, and more reliable way than otherwise would be possible.
Date:
June 1929
Creator:
Seewald, F.
System:
The UNT Digital Library
Technical report of the 1928 Rhon soaring-flight contest
Report presenting some information on the gliders that participated in the 1928 Rhön soaring flight contest. Almost all of the gliders represented an improvement over gliders used in the previous years. A great increase in the skill of the glider pilots is also noted.
Date:
May 1929
Creator:
Lippisch, A.
System:
The UNT Digital Library
Lautal as a Material for Airplane Construction
Lautal is a refinable aluminum alloy which, unlike duralumin, contains no magnesium. According to the statements of the Lauta Works, lautal contains: aluminum, 94%; copper, 4%; silicon, 2%. The use of lautal as a construction material is discussed in relation to specific weight, production methods, and riveting tests.
Date:
August 1929
Creator:
Brenner, Paul
System:
The UNT Digital Library
The Vertical Accelerometer, a New Instrument for Air Navigation
This report endeavors to show the possibility of determining the rate of acceleration and the advantage of having such an accelerometer in addition to other aviation instruments. Most of the discussions concern balloons.
Date:
October 1923
Creator:
Laboccetta, Letterio
System:
The UNT Digital Library
Experimental Investigation of the Physical Properties of Medium and Heavy Oils, Their Vaporization and Use in Explosion Engines Part 2
This report is an evaluation of the experiments on the use of heavy oils in explosion engines. A method for determining the heat of vaporization of these heavy oils is presented.
Date:
May 1926
Creator:
Heinlein, Fritz
System:
The UNT Digital Library
Resistance of Plates and Pipes at High Reynolds Numbers
It was learned that the law of resistance for high R values does not follow the simple powers, and that the powers, which can be obtained approximately for the velocity distribution, gradually change. Since, moreover, very important investigations have recently been made on the resistance of plates at very high R values, it seemed of interest to apply the above line of reasoning to the new general law of resistance. For this purpose, the resistance and velocity distribution along the plate must always be equal to the values of the pipe flow at the corresponding Reynolds number.
Date:
January 1931
Creator:
Schiller, L. & Hermann, R.
System:
The UNT Digital Library
Contribution to the Study of Normal Burning in Gaseous Carbureted Mixtures: Part 1
In the present study it is proposed to provide an equipment permitting the study of the propagation of the region of reaction in mixtures of air and carbureted gases enclosed within a cylinder. Ignition is produced at the end of compression by an electric spark. With this apparatus it is proposed to determine: 1) the influence of the richness of the explosive mixture on the rate of flame propagation; 2) the influence of the degree of volumetric compression on one of the hydrocarbons; 3) the influence of the variation of initial temperature of the mixture before compression; 4) the influence of tetraethyl-lead on the propagation - notably on the formation of the explosive wave.
Date:
January 1930
Creator:
Duchene, M. R.
System:
The UNT Digital Library
Fatigue of Internal Combustion Engines
Engine conditions such as pressure characteristics, temperatures, and mechanical fatigue enable the employment of a criterion of general fatigue which simultaneously takes account of both mechanical and thermal conditions, for the sake of comparing any projected engine with engines of the same type already in use.
Date:
April 1924
Creator:
Dumanois, P.
System:
The UNT Digital Library
Airplane Drag
It has been less well understood that the induced drag (or, better said, the undesired increase in the induced drag as compared with the theoretical minimum calculated by Prandtl) plays a decisive role in the process of taking off and therefore in the requisite engine power. This paper seeks to clarify the induced drag.
Date:
December 1929
Creator:
Töpfer, Carl
System:
The UNT Digital Library
Digest of Some of the Speeches Made at the Fifteenth Regular Meeting of the Wissenschaftliche Gesellschaft Für Luftfahrt: June 17, 1926, in Dusseldorf, Germany
Memorandum presenting a description of some of the speeches made at the fifteenth regular meeting of the Wissenschaftliche Gesellschaft für Luftfahrt. Many of the speeches were conducted on aircraft design and construction, but some covered topics like statistics.
Date:
September 1926
Creator:
unknown
System:
The UNT Digital Library
Theoretical Investigation of the Effect of the Ailerons on the Wing of an Airplane
The present work investigates, on the basis of Prandtl's wing theory, the form of the lift distribution when the ailerons are deflected in opposite directions. An ideal fluid and a wing with a rectangular form are assumed. The moments must not cause any rotation of the wing or any deviation from the rectilinear motion.
Date:
April 1929
Creator:
Wieselsberger, C.
System:
The UNT Digital Library
Fixed Air-Cooled Engines
"It is proposed to analyze the advantages and disadvantages of large fixed air-cooled radial engines and to explain how the problems have been solved by the Bristol Aeroplane Company" (p. 1).
Date:
February 1923
Creator:
Fedden, A. H.
System:
The UNT Digital Library
Trend to Be Given Aerodynamical Research and Experiment
The causes of error in experiments conducted in wind tunnel tests are given and the value of in-flight tests are promoted. The four main causes explored include neglect of the laws of dynamic similitude, interference between the support and the model, nature of the air stream, and the influence of the walls of the tunnel.
Date:
June 1923
Creator:
Lèpere, M.
System:
The UNT Digital Library
Photographic Time Studies of Airplane Paths
The object of this report is the description of a method which seems to be practicable for determining the path of an airplane, especially in taking off and landing. This report tells how, by means of a camera, preferably a kinetograph, which simultaneously photographs a stop watch the distance of an airplane from the camera and its height above the ground can be determined.
Date:
January 1926
Creator:
Von Baumhauer, A. G.
System:
The UNT Digital Library
Experimental Investigation of the Physical Properties of Medium and Heavy Oils, Their Vaporization and Use in Explosion Engines Part 4
This report presents a theoretical treatment of the vaporization process of medium and heavy oils. The results of this investigation, which were mostly obtained from the lighter components of the heavy fuels, require a 10- or 16-fold vaporization in comparison with gasoline. We must attain a still finer degree of atomization, in order to include the heavier components.
Date:
December 1926
Creator:
Heinlein, Fritz
System:
The UNT Digital Library
Contribution to the Technique of Landing Large Airships: Part 2
Memorandum presenting a description of the development of the mooring mast and how it contributes to the technique of landing large airships. Some of its fundamental requirements and how it can factor into safe landings are provided.
Date:
May 1929
Creator:
Krell, O.
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