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Lift Theory of Supporting Surfaces: Second Article
Memorandum presenting a description of the hydrodynamic lift theory of supporting services. This report is mainly about the task of finding suitable wing sections for given lift conditions. Formulas are given for lift magnitude and moment, which make it possible to obtain solutions of great simplicity and clearness.
Date:
September 1921
Creator:
von Mises, R.
System:
The UNT Digital Library
Lecture on Aerodynamics
This lecture deals with four main subjects: methods of studying air resistance, experimental aerodynamics, propellers and stability of airplanes.
Date:
September 1923
Creator:
Toussaint, A.
System:
The UNT Digital Library
Drag Measurements on a Junkers Wing Section: Application of the Betz Method to the Results of Comparative Tests Made on a Model and on an Airplane in Flight
The comparison of model tests in flight can be based on the result of such measurements. They are very important from the aerodynamical point of view, as they lead to useful conclusions regarding the behavior of the wing, its best shape and the conformity of theoretical and actual flow. Although there still remains a certain prejudice against such measurements, I have still attempted to make these comparative tests in order to inspire confidence in their reliability.
Date:
September 1927
Creator:
Weidinger, Hanns
System:
The UNT Digital Library
Recent Developments in the Construction and Operation of All-Metal Airplanes
Experiments on the effect of atmosphere and of sea water on the building materials employed by us have been carried on for years in the North Sea with the aid of the Hamburg Naval Observatory. Parallel experiments are being made at the Pisa Naval Observatory in the Mediterranean Sea. Metal sheets, sections, assemblies and experimental floats are being exposed to the action of the elements. Different construction techniques are discussed and a variety of specific airplanes are presented which incorporate some of the new thinking.
Date:
September 1926
Creator:
Dornier, C.
System:
The UNT Digital Library
Atomization of Liquid Fuels Part 3: Critical Discussion of Experimental Reesults, Mixing the Atomized Fuel with Air
This report provides a critical discussion of the results of the experiments conducted in the previous NACA-TM's 329 and 330. The main object of this investigation was to determine the size of the drops in mechanical atomization.
Date:
September 1925
Creator:
Kuehn, R.
System:
The UNT Digital Library
Motive Power Required to Operate a Wind Tunnel
The use of exit cones and different blade configurations to reduce the motive power required in wind tunnels is discussed in this report.
Date:
September 1924
Creator:
Ziembinski, S.
System:
The UNT Digital Library
Experiments With Airplane Brakes
This report begins by examining the forces on the brake shoes. For the determination of the load distribution over the shoes it was assumed that the brake linings follow Hooke's law, are neatly fitted and bedded in by wear. The assumption of Hooke's law, that is, the proportionality between compression of the lining and the absorption of force, is fulfilled to a certain extent for the loading, as becomes apparent from the load tests described further on. But there is a material discrepancy at unloading.
Date:
September 1931
Creator:
Michael, Franz
System:
The UNT Digital Library
Aviation Spirit - Past, Present, and Future
The volatile fuel of the high-speed internal combustion engine has, in the past, consisted almost exclusively of the lighter distillates from crude petroleum. Alternative and supplementary fuels are discussed such as: tetraline, dekalin, alcohol, cyclo-hexenes.
Date:
September 1923
Creator:
Dunstan, A. E. & Thole, F. B.
System:
The UNT Digital Library
Travel of the Center of Pressure of Airfoils Transversely to the Air Stream
The experiments here described were performed for the purpose of obtaining the essential facts concerning the distribution of the air force along the span. We did not follow, however, the time-consuming method of point-to-point measurements of the pressure distribution on the wing surfaces, but determined directly the moment of mean force about an axis passing through the middle of the span parallel to the direction of flight.
Date:
September 1929
Creator:
Katzmayr, Richard
System:
The UNT Digital Library
Load Assumptions for Calculating the Strength of Airplanes
"The following load assumptions shall be taken as the basis of the strength calculations. Certain definite load conditions (e.g. of flight, control, landing and transport) shall be assumed. The loads shall be assumed to be safe loads, constant or only slowly variable, and the inertia forces due to elastic deformation are accordingly disregarded. The external forces, the force of gravity and the inertia forces on the whole airplane shall produce a condition of equilibrium" (p. 1).
Date:
September 1930
Creator:
unknown
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
Government Relations With Air Traffic Companies and Owners of Touring Airplanes
This report presents a recapitulation of air traffic in France and her colonies as well as a discussion of the subsidies provided by the government.
Date:
September 1923
Creator:
unknown
System:
The UNT Digital Library
On Floats and Float Tests
The principal source of information on float resistance is the model test. In view of the insuperable difficulties opposing any attempt at theoretical treatment of the resistance problem, particularly at attitudes which tend toward satisfactory take-off, such as the transitory stage to planing, the towing test is and will remain the primary method for some time.
Date:
September 1931
Creator:
Seewald, Friedrich
System:
The UNT Digital Library
Effects of the End Fixation of Airplane Struts
The main purpose of this report is to give references to literature on the subject of end fixation of airplane struts and also to furnish the constructor with a general survey of the simplest methods for estimating the end-fixation effect.
Date:
September 1930
Creator:
Teichmann, Alfred
System:
The UNT Digital Library
The Belgian Aerotechnical Laboratory at Rhode-Saint-Genèse
This report describes the layout of the laboratory along with the motor and balance for the wind tunnel.
Date:
September 1926
Creator:
unknown
System:
The UNT Digital Library
The Dangerous Sideslip of a Stalled Airplane and Its Prevention
This investigation covers only that phase of airplane accidents which are the result of sideslip. We examine the circumstances under which this occurs, study the behavior of present-day airplane types (monoplane, conventional and staggered biplane) therein and endeavor to find a solution whereby this danger may be avoided.
Date:
September 1931
Creator:
Fuchs, Richard & Schmidt, Wilhelm
System:
The UNT Digital Library
Building a Full-Size Glider
The building and flying of a glider is possible for anyone who can use a few basic tools. This report presents some plans and techniques for building your own glider.
Date:
September 1927
Creator:
Camm, F. J.
System:
The UNT Digital Library
Flight Tests for the Determination of Static Longitudinal Stability
The accuracy of the instruments used for flight test measurements has been inadequate so a new series of tests were commissioned with the development of an accurate elevator setting recorder.
Date:
September 1930
Creator:
Blenk, Hermann
System:
The UNT Digital Library
Control of Airplanes at Low Speeds
Loss of control over the orientation of an airplane as the incidence approaches and enters the region of stalled flight is a prolific cause of serious accidents. This report discusses methods of landing at slow speeds approaching stall.
Date:
September 1923
Creator:
Wood, R. McKinnon
System:
The UNT Digital Library
Preliminary Report on British Commercial Aeronautics
This report briefly recounts the history of British commercial aviation and then goes on to look at the equipment, governmental relations, operations, and air traffic.
Date:
September 1925
Creator:
Van Zandt, J. Parker
System:
The UNT Digital Library
Atomization of Liquid Fuels Part 1: Relation Between Atomization and Combustion, Methods Employed for Determining the Size of Particles and Small Drops, Choice of Experimental Method
In the present treatise we will consider chiefly the problem of solid injection in comparison with air injection. On leaving the valve or nozzle through one or more small openings, the fuel is split up into innumerable fine drops, which penetrate the combustion chamber in divergent directions in the form of a conical jet. The efficiency of this jet is judged from the following three viewpoints: 1) with respect to the fineness of atomization; 2) with respect to the direction or distribution of sprayed particles; 3) with respect to the penetration of the particles.
Date:
September 1925
Creator:
Kuehn
System:
The UNT Digital Library
Experiments on Autorotation
This article deals principally with Professor Bairstow's experiments on autorotation, in which the wing is free to rotate about an axis in its plane of symmetry, which axis is parallel with the direction of the wind.
Date:
September 1926
Creator:
Anderlik, E.
System:
The UNT Digital Library
Effects of Roughness on Airfoils
We will here report on the effects of coarsely roughening not only the pressure side but also the suction or upper side of airfoils, as the first group of a larger series of experiments.
Date:
September 1927
Creator:
Schrenk, O.
System:
The UNT Digital Library
Experiments on airfoils with trailing edge cut away
"Airfoils with their trailing edge cut away are often found on aircraft, as the fins on the hulls of flying boats and the central section of the wings for affording better visibility. It was therefore of some interest to discover the effect of such cutaways on the lift and drag and on the position of the center of pressure. For this purpose, systematic experiments were performed on two different airfoils, a symmetrical airfoil and an airfoil of medium thickness, with successive shortenings of their chords" (p. 1).
Date:
September 1927
Creator:
Ackeret, J.
System:
The UNT Digital Library