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Lift Theory of Supporting Surfaces: Second Article

Description: 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.
Partner: UNT Libraries Government Documents Department
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Lecture on Aerodynamics

Description: 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.
Partner: UNT Libraries Government Documents Department
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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

Description: 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
Partner: UNT Libraries Government Documents Department
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Recent Developments in the Construction and Operation of All-Metal Airplanes

Description: 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 in… more
Date: September 1926
Creator: Dornier, C.
Partner: UNT Libraries Government Documents Department
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Motive Power Required to Operate a Wind Tunnel

Description: 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.
Partner: UNT Libraries Government Documents Department
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Experiments With Airplane Brakes

Description: 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 u… more
Date: September 1931
Creator: Michael, Franz
Partner: UNT Libraries Government Documents Department
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Aviation Spirit - Past, Present, and Future

Description: 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.
Partner: UNT Libraries Government Documents Department
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Travel of the Center of Pressure of Airfoils Transversely to the Air Stream

Description: 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
Partner: UNT Libraries Government Documents Department
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Load Assumptions for Calculating the Strength of Airplanes

Description: "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
Partner: UNT Libraries Government Documents Department
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Digest of Some of the Speeches Made at the Fifteenth Regular Meeting of the Wissenschaftliche Gesellschaft Für Luftfahrt: June 17, 1926, in Dusseldorf, Germany

Description: 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
Partner: UNT Libraries Government Documents Department
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On Floats and Float Tests

Description: 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
Partner: UNT Libraries Government Documents Department
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Effects of the End Fixation of Airplane Struts

Description: 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
Partner: UNT Libraries Government Documents Department
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The Dangerous Sideslip of a Stalled Airplane and Its Prevention

Description: 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
Partner: UNT Libraries Government Documents Department
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Building a Full-Size Glider

Description: 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.
Partner: UNT Libraries Government Documents Department
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Flight Tests for the Determination of Static Longitudinal Stability

Description: 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
Partner: UNT Libraries Government Documents Department
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Aerodynamic Laboratory at Cuatro Vientos

Description: This report presents a listing of the many experiments in aerodynamics taking place at Cuatro Vientos. Some of the studies include: testing spheres, in order to determine coefficients; mechanical and chemical tests of materials; and various tests of propeller strength and flexibility.
Date: September 1922
Creator: Jubera
Partner: UNT Libraries Government Documents Department
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Fatigue Resistance of Duralumin

Description: Where, in the following report, mention is made of fatigue, it always refers to the weakening of the material produced by rapidly changing stresses below the point of elasticity. The alternating stress was obtained by a test bar which was held at one end and subjected to rotation. Most of the tests were conducted on connecting rods.
Date: September 1922
Partner: UNT Libraries Government Documents Department
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Problem of Glider Models

Description: Any one endeavoring to solve the problem of soaring flight is confronted not only by structural difficulties, but also by the often far more difficult aerodynamic problem of flight properties and efficiency, which can only be determined by experimenting with the finished glider. The report primarily considers open-air experiments with glider models and some specific elements of gliders that have been studied using these experiments.
Date: September 1922
Creator: Espenlaub, Lippisch
Partner: UNT Libraries Government Documents Department
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Wind Vane With Various Applications

Description: A design for a wind vane is presented and various applications are discussed. The equations that can be used to calculate effects on the aircraft using the vane and control assistance that can be provided using the wind vane are provided.
Date: September 1922
Creator: Constantin, M. Louis
Partner: UNT Libraries Government Documents Department
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Giant Airplanes

Description: It is hardly possible for the most imaginative aeronautical enthusiast to look forward to a time when the airplane will have reached the dimensions commensurate with those already attained by the airship.
Date: September 1922
Creator: Warner, Edward P.
Partner: UNT Libraries Government Documents Department
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International Aspects of Air Travel

Description: This article discusses two areas of international air travel, namely, passports and customs, as well as smuggling.
Date: September 1922
Creator: Warner, Edward P.
Partner: UNT Libraries Government Documents Department
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