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Preliminary Report on the Problem of the Atmosphere in Relation to Aeronautics
A report to the Weather Bureau, Washington DC, from the chairman of the Subcommittee on the Atmosphere in Relation to Aeronautics describing the activities accomplished and the proposal of work to be undertaken by the subcommittee.
Date:
November 9, 1915
Creator:
Marvin, Charles F.
System:
The UNT Digital Library
Comparison of Alcogas Aviation Fuel With Export Aviation Gasoline
Mixtures of gasoline and alcohol when used in internal combustion engines designed for gasoline have been found to possess the advantage of alcohol in withstanding high compression without "knock" while retaining advantages of gasoline with regard to starting characteristics. Test of such fuels for maximum power-producing ability and fuel economy at various rates of consumption are thus of practical importance, with especial reference to high-compression engine development. This report discusses the results of tests which compares the performance of alcogas with x gasoline (export grade) as a standard.
Date:
November 25, 1919
Creator:
Gage, V. R.; Sparrow, S. W. & Harper, D. R.
System:
The UNT Digital Library
Development of the Inflow Theory of the Propeller
Report discusses the theory of inflow of the propeller and the fact that both suctional axial velocity and suctional tangential velocity must be considered when calculating the maximum efficiency.
Date:
November 1920
Creator:
Betz, A.
System:
The UNT Digital Library
Göttingen Wind Tunnel for Testing Aircraft Models
Given here is a brief description of the Göttingen wind tunnel for the testing of aircraft models, preceded by a history of its development. Included are a number of diagrams illustrating, among other things, a sectional elevation of the wind tunnel, the pressure regulator, the entrance cone and method of supporting a model for simple drag tests, a three-component balance, and a propeller testing device, all of which are discussed in the text.
Date:
November 1920
Creator:
Prandtl, L.
System:
The UNT Digital Library
Horizontal Buoyancy in Wind Tunnels
Note presenting an examination of horizontal buoyancy in wind tunnels, including an examination of the relative flow, static pressure gradient, horizontal buoyancy computation, and methods of computation in practical use are provided.
Date:
November 1920
Creator:
Zahm, A. F.
System:
The UNT Digital Library
Italian and French Experiments on Wind Tunnels
Given here are the results of experiments conducted by Colonel Costanzi of the Italian Army to determine the influence of the surrounding building in which a wind tunnel was installed on the efficiency of the installation, and how the efficiency of the installation was affected by the design of the tunnel. Also given are the results of a series of experiments by Eiffel on 34 models of tunnels of different dimensions. This series of experiments was started in order to find out if, by changing the shape of the nozzle or of the diffuser of the large tunnel at Auteuil, the efficiency of the installation could be improved.
Date:
November 1920
Creator:
Knight, William
System:
The UNT Digital Library
The Photographic Recording of Small Motions
Methods and equipment for recording small and sometimes rapid motions by photographic means are described, and the efficacy of photographic recording in such instances is evaluated. The optical system consisting of the light source, the mirror or prism for transmitting motion to the emergent beam, and a means of bringing the rays into focus on the film are discussed. Attention is given to the critical issue of mirror mounting.
Date:
November 1920
Creator:
Norton, F. H.
System:
The UNT Digital Library
Recent Developments in Light Alloys
This report is intended to cover the progress that has been made in both the manufacture and utility of light alloys in the United States since the first part of 1919. Duralumin is extensively discussed both as to manufacture and durability.
Date:
November 1920
Creator:
Woodward, R. W.
System:
The UNT Digital Library
Tests of Artificial Flight at High Altitudes
"If we wish to form an accurate idea of the extraordinary progress achieved in aeronautics, a comparison must be made of the latest altitude records and the figures regarded as highest attainable limit some ten years ago. It is desirable, for two reasons, that we should be able to define the limit of the altitudes that can be reached without artificial aid. First, to know to what extent the human body can endure the inhalation of rarified air. Second, the mental capacity of the aviator must be tested at high altitudes and the limit known below which he is able to make reliable observations without being artificially supplied with oxygen" (p. 1).
Date:
November 1920
Creator:
Gradenwitz, Arthur
System:
The UNT Digital Library
Variable Pitch Propellers
In this report are described four different types of propellers which appeared at widely separated dates, but which were exhibited together at the last Salon de l'Aeronautique. The four propellers are the Chaviere variable pitch propeller, the variable pitch propeller used on the Clement Bayard dirigible, the variable pitch propeller used on Italian dirigibles, and the Levasseur variable pitch propeller.
Date:
November 1920
Creator:
Bacon, D. L.
System:
The UNT Digital Library
Aeronautic Instruction in Germany
This report contains a list of the courses relating to aeronautics announced in Germany, both in the technical high schools and in the universities.
Date:
November 1921
Creator:
Bouche, Henri
System:
The UNT Digital Library
The Choice of Wing Sections for Airplanes
"The subject of the choice of an airfoil section is by no means a closed one, and despite the impossibility of making a single rule serve, it is quite practicable to deduce in a strictly rational manner a series of rules and formulas which are capable of being of the greatest use if we but confine ourselves to the consideration of one element of performance at a time. There are seven such elements of performance which are here taken up in turn. The seven are of different relative importance in different types of airplanes. The seven elements are: maximum speed regardless of minimum; maximum speed for given minimum; maximum speed range ratio; maximum rate of climb; maximum absolute ceiling; maximum distance non-stop; and maximum duration non-stop" (p. 1-2).
Date:
November 1921
Creator:
Warner, Edward P.
System:
The UNT Digital Library
The danger of stalled flight and an analysis of the factors which govern it
A definition of "stalled fight" is presented as well as a detailed discussion on the how and why it occurs. Some suggestions are made to prevent its occurrence such as carrying an air speed instrument in the airplane.
Date:
November 1921
Creator:
Hopf, L.
System:
The UNT Digital Library
Establishment of Aviation Schools
Report presenting a discussion of the creation of a suitable aviation school and some of the characteristics that should be considered in terms of hiring personnel, creating a curriculum, and obtaining equipment.
Date:
November 1921
Creator:
Kempe, Erich
System:
The UNT Digital Library
Experiments With Slotted Wings
Note presenting an investigation of various aspects of slotted wings, including some theoretical and experimental results and characteristics of certain slotted wings currently in production.
Date:
November 1921
Creator:
Lachmann, G.
System:
The UNT Digital Library
Extracts From the Belgian Regulations for Government Assistance to Air Transport Companies
Report presenting information regarding the usage of commercial and passenger service air routes and the fees and penalties involved in operating an air line.
Date:
November 1921
Creator:
unknown
System:
The UNT Digital Library
An Investigation on the Effect of Raked Wing Tips
This investigation was carried out by request of the United States Air Service in the wind tunnel of the Massachusetts Institute of Technology. The results are here published by the National Advisory Committee for Aeronautics as it is thought that they may be of general interest. Wings of the R.A.F. 6 section are tested with various angles of rake, and it is found that although rake has very little effect, a positive or negative rake of 30 degrees is the best.
Date:
November 1921
Creator:
Norton, F. H.
System:
The UNT Digital Library
Pressure Measurements During Flight
The general idea was to record the air pressure on the spot, that is, without intervening tubes, by some simple automatic registering device. This was therefore made in such small dimensions that it could be inserted into the wing between the ribs and stand in direct connection with the pressure openings. The results of different experiments are presented along with the best locations for locating the instruments for recording the pressure.
Date:
November 1921
Creator:
Pröll, A.
System:
The UNT Digital Library
Traffic Airships With Special Reference to Economy
The first part of this report details the efficiency and economy of airship travel, while the second part presents methods of economic efficiency with regards to construction, cost of upkeep and operation, and the establishment of airship lines.
Date:
November 1921
Creator:
Leyensetter, Walther
System:
The UNT Digital Library
Vortices and the Related Principles of Hydrodynamics
Here, conceptions concerning vortices are illustrated by the simplest possible examples. Mathematical formulas and similar means of presentation, which, for the most part, do not help the understanding of persons not versed therein, have been avoided as much as possible. Instead, the author has endeavored to demonstrate the phenomena by means of simple geometrical and mechanical illustrations. For the sake of clarity, the author chiefly considers currents in one plane only, a situation that can be readily represented by diagrams. Some of the peculiarities of vortices in three dimensional flow are briefly discussed.
Date:
November 1921
Creator:
Betz, A.
System:
The UNT Digital Library
Aeronautical Museums
Different methods of presenting aeronautical artifacts are examined. The advantages of operating an aeronautical museum and its ability to increase public interest in aircraft are provided.
Date:
November 1922
Creator:
Warner, Edward P.
System:
The UNT Digital Library
Air reactions to objects moving at rates above the velocity of sound with application to the air propeller
From Discussion: "To meet these unusual conditions three sets of ball-bearings were employed and arranged in tandem, thereby reducing their speeds by the ratio of the number of sets used, as shown in Fig.3. This proved to be a complete success. The results obtained in experiments with a two-blade, 4 foot propeller of series 2, are given in Fig. 9."
Date:
November 1922
Creator:
Reed, S. Albert
System:
The UNT Digital Library
Causes of Failure of Airship Sheds
Different causes of airship shed collapse are discussed, with suction and human carelessness being the prime causes.
Date:
November 1922
Creator:
Sonntag, R. & Hoff, W.
System:
The UNT Digital Library
Commercial Aviation in France
In the present state of things, there are three great problems to be solved, relating respectively to the financial, technical, and commercial aspects of the question of commercial aviation.
Date:
November 1922
Creator:
unknown
System:
The UNT Digital Library