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Automatic Stability of Airplanes

Description: It is endeavored in this report to give a full outline of the problem of airplane stability and to classify the proposed solutions systematically. Longitudinal stability, which can be studied separately, is considered first. The combination of lateral and directional stabilities, which cannot be separated, will be dealt with later.
Date: December 1932
Creator: Haus
Partner: UNT Libraries Government Documents Department
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Automatic Stabilization

Description: This report lays more stress on the principles underlying automatic piloting than on the means of applications. Mechanical details of servomotors and the mechanical release device necessary to assure instantaneous return of the controls to the pilot in case of malfunction are not included. Descriptions are provided of various commercial systems.
Date: December 1936
Creator: Haus
Partner: UNT Libraries Government Documents Department
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The Breda Wind Tunnel

Description: A description of the design and construction of the Breda wind tunnel. The tunnel is equipped with a two-meter throat diameter and a 310 kph velocity potential.
Date: December 1939
Creator: Pittoni, Mario
Partner: UNT Libraries Government Documents Department
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The Cetene Scale and the Induction Period Preceding the Spontaneous Ignition of Diesel Fuels in Bombs

Description: In the present report a comparison is made between the scale obtained with mixtures of cetane and l-methyl naphthalene in a bomb, and that obtained with the same fuels in a Waukesha engine. The tests were conducted in a metal bomb heated by a Nichrome spiral. The fuel was injected into the bomb from a Bosch jet by means of a specially constructed plunger pump. The instant injection and the pressure curve in the bomb were registered by a beam of light which was reflected from a mirror connected … more
Date: December 1936
Creator: Michailova, M. N. & Neumann, M. B.
Partner: UNT Libraries Government Documents Department
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Contribution to the Aerodynamics of Rotating-Wing Aircraft

Description: "The chief defect of the investigations up to now was the assumption of a more or less arbitrary "mean" drag coefficient for a section of the blade. This defect is remedied through replacement of the constant coefficient by a function of higher order which corresponds to the polar curve of the employed profile. In that way it is possible to extend the theory to include the entire range from "autogyro" without power input to the driven "helicopter" with forward-tilted rotor axis. The treatment i… more
Date: December 1939
Creator: Sissingh, G.
Partner: UNT Libraries Government Documents Department
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Development of a Non-Autorotative Airplane Capable of Steep Landing

Description: In the following we develop a non-autorotating monoplane wing. The conditions imposed on such a wing, aside from its freedom from autorotation,with respect to its polars and its construction, are taken into account as far as possible. It is indicated that the autorotation characteristics of a wing are dependent upon the speed of air flow as well as on the angle of yaw. This report postulates the knowledge of the behavior of certain conventional wings of different chords and cambers with respect… more
Date: December 1931
Creator: Schmidt, Wilhelm
Partner: UNT Libraries Government Documents Department
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Distribution of Temperatures Over an Airplane Wing With Reference to the Phenomena of Ice Formation

Description: The results obtained from the present study of temperature distribution over an airplane wing afford means for making the following statements as regards the conditions of ice accretion and the use of a thermic anti-icer or de-icer: 1) Ice can form on a wing only when the temperature is below or hovering around zero. 2) The thermic effects produced on contact of the air with the moving wing rather oppose ice accretion. 3) The thermic procedure in the fight against ice accretion on the wing cons… more
Date: December 1938
Creator: Brun, Edmond
Partner: UNT Libraries Government Documents Department
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The Effect of Weight and Drag on the Sinking Speed and Lift/Drag Ratio of Gliders

Description: The most important factors in evaluating performance of gliders are minimum sinking speed and minimum gliding angle. To assure their optimum value the energy necessary for flight, that is, the energy of lift and friction must be kept very low, or in other words, weight and total drag which have a decisive effect on the sinking speed and on the gliding angle, must be kept to a minimum. How great the effect of a reduction of these two quantities will be shown in the following.
Date: December 1934
Creator: Kosin, R.
Partner: UNT Libraries Government Documents Department
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English Airplane Construction

Description: English airplane construction is presented with a particular emphasis on metal construction techniques. Steel rib and fuselage construction are discussed as well as the use of duralumin in construction.
Date: December 1930
Creator: Schwencke, D.
Partner: UNT Libraries Government Documents Department
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Experimental Studies of the Effective Width of Buckled Sheets

Description: The object of the present experiments is a more exact determination of the effective width for the case of pure compression and of the sheet clamped at the angle section. From the experimental data of the effective width the calculation of the buckling load of an angle joined to a thin sheet is then deduced. The test material consisted of spring-hardened brass sheet.
Date: December 1936
Creator: Lahde, R. & Wagner, H.
Partner: UNT Libraries Government Documents Department
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The Flight of an Autogiro at High Speed

Description: This report presents a method for computing the flight performance of an autogiro at high speed, the velocity component along the blades being accounted for by calculation of the profile drag and the equation for zero torque.
Date: December 1933
Creator: Bennett, J. A.
Partner: UNT Libraries Government Documents Department
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Goldstein's Solution of the Problem of the Aircraft Propeller With a Finite Number of Blades

Description: This report examines the Betz theory on frictionless, lightly loaded propellers and Prandtl's addendum extended to moderately loaded propellers. The author then goes on to extend the discussion to Goldstein's solution for propellers with a finite number of blades.
Date: December 1931
Creator: Helmbold, H. B.
Partner: UNT Libraries Government Documents Department
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Liquid Cooling of Aircraft Engines

Description: This report presents a method for solving the problem of liquid cooling at high temperatures, which is an intermediate method between water and air cooling, by experiments on a test-stand and on an airplane. A utilizable cooling medium was found in ethylene glycol, which has only one disadvantage, namely, that of combustibility. The danger, however is very slight. It has one decided advantage, that it simultaneously serves as protection against freezing.
Date: December 1931
Creator: Weidinger, Hanns
Partner: UNT Libraries Government Documents Department
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Modern Methods of Testing

Description: After a brief survey of the commonly used single-value test methods, the importance of the determination of the incipient knock for the octane number is discussed and improvements suggested for the knock testing in the CFR engine. The DVL supercharge test method with its superiority of direct determination of fuel knock in each single cylinder of an airplane engine without involving structural changes, is described and the advantages of a multiple-value method enumerated. A diagrammatic present… more
Date: December 1939
Creator: Seeber, F.
Partner: UNT Libraries Government Documents Department
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Practical Experiences With Lightning Discharges to Airplanes

Description: The present report describes many cases of airplanes being struck by lightning and the measures that can be taken to minimize damage to them. The data indicates that the hazard to airplanes from lightning is overestimated and that dangers can be minimized by appropriate weather forecasts and training of the pilots.
Date: December 1933
Creator: Koppe, Heinrich
Partner: UNT Libraries Government Documents Department
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Riveting in Metal Airplane Construction Part 1 : Riveting Methods and Equipment in German Metal Airplane Construction

Description: "Although all constructors in Germany use duralumin quite frequently, and prefer cold riveting exclusively for permanent (nondetachable) connections of individual structural components, their methods and equipment are very diversified. The differences are due to a great extent to the diversity of structural types and to the special shapes of the individual subassemblies. The results is that different manufacturers have developed totally different riveting methods, as well as entirely different … more
Date: December 1930
Creator: Pleines, Wilhelm
Partner: UNT Libraries Government Documents Department
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Riveting in Metal Airplane Construction Part 2: Riveting Methods and Equipment (Concluded), Strength of Riveted Joints in Duralumin

Description: This report includes descriptive material on rivet inspection, types of rivets and sizes. Tabular data on shearing strength of rivets at failure, ultimate shear of various rivets, tensile tests of rivet plate, and tensile strength values of riveted joints are provided.
Date: December 1930
Creator: Pleines, Wilhelm
Partner: UNT Libraries Government Documents Department
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Riveting in Metal Airplane Construction Part 3: Strength of Riveted Joints in Duralumin (Continued), Test Installation and Arrangement

Description: This report includes strength of riveted joints in duralumin, descriptions of test procedure and results of tests. Tabulated data includes: curshing strength by failure for various conditions, shearing strength of hole edge zone in direction of tearing, tearing strengths of plates weakened by rivet holes, and enlargement of holes at beginning of break.
Date: December 1930
Creator: Pleines, Wilhelm
Partner: UNT Libraries Government Documents Department
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Riveting in Metal Airplane Construction Part 4: Strength of Riveted Joints in Duralumin (Concluded), Comparative Tests With Riveted Joints

Description: Tests were made to determine the crushing strength of a riveted joint, in order to define the difference in crushing stregth between a strictly bolted joint and a riveted joint. The object was to tabulate the crushing strength by failure on various plate thicknesses for a one-rivet double-shear riveted joint.
Date: December 1930
Creator: Pleines, Wilhelm
Partner: UNT Libraries Government Documents Department
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Trend of Airplane Flight Characteristics

Description: This report describes the development of airplane characteristics since the war and indicates the direction development should take in the immediate future. Some of the major topics include: the behavior of an airplane about its lateral, vertical, and longitudinal axes. Behavior at large angles of attack and landing characteristics are also included.
Date: December 1933
Creator: Von Köppen, Joachim
Partner: UNT Libraries Government Documents Department
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Wind Tunnel of the Bucharest Polytechnic Institute

Description: This report describes the Bucharest wind tunnel and presents numerous photographs and diagrams. The wind tunnel is of the closed- circuit type, the return being symmetrical with respect t o the longitudinal axis of the tunnel. Th e tunnel is of the horizontal type with a diameter of 3. 2 m (10. 5-ft.) a t the beginning of the entrance cone, and 1.5 m ( 4,92 ft.) at the entrance to the test chamber. The latter, 2 m (6.56 ft.) long, may be either of the open-jet type or enclosed in a cylindrical … more
Date: December 1931
Partner: UNT Libraries Government Documents Department
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