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Behm Acoustic Sounder for Aircraft

Description: The Behm acoustic sounder for aircraft enables the barometric determination for the altitude by night or fog and therefore promises to prove of great importance in safeguarding air traffic.
Date: January 1926
Partner: UNT Libraries Government Documents Department
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Calculation of Tubular Radiators of the Automobile Type

Description: "We propose to show how to calculate the cooling capacity of all radiators through which the air flows in separate streamlets, whether enclosed in actual tubes or not and whatever cross-sectional shape the tubes may have. The first part will give the fundamental principles for calculating velocity of air in the tubes and the heat exchange by radiation, conduction and convection, and show, by examples, the agreement of the calculation with experiments. In the second part, the effect of the dimen… more
Date: January 1926
Creator: Richter, L.
Partner: UNT Libraries Government Documents Department
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Photographic Time Studies of Airplane Paths

Description: 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.
Partner: UNT Libraries Government Documents Department
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Removing boundary layer by suction

Description: "Through the utilization of the "Magnus effect" on the Flettner rotor ship, the attention of the public has been directed to the underlying physical principle. It has been found that the Prandtl boundary-layer theory furnishes a satisfactory explanation of the observed phenomena. The present article deals with the prevention of this separation or detachment of the flow by drawing the boundary layer into the inside of a body through a slot or slots in its surface" (p. 1).
Date: January 1926
Creator: Ackeret, J.
Partner: UNT Libraries Government Documents Department
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Two-Stroke-Cycle Engines for Airplanes

Description: Now that the two-stroke-cycle engine has begun to make its appearance in automobiles, it is important to know what services we have a right to expect of it in aeronautics, what conditions must be met by engines of this type for use on airplanes and what has been accomplished.
Date: January 1926
Creator: Jalbert, J.
Partner: UNT Libraries Government Documents Department
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Change of 180 Degrees in the Direction of a Uniform Current of Air

Description: In the construction of aerodynamic tunnels, it is a very important matter to obtain a uniform current of air in the sections where measurements are to be made. The straight type ordinarily used for attaining a uniform current and generally recommended for use, has great defects. If we desire to avoid these defects, it is well to give the canals of the tunnel such a form that the current, after the change of direction of its asymptotes, approximates a uniform and rectilinear movement. But for th… more
Date: February 1926
Creator: Witoszynski, C.
Partner: UNT Libraries Government Documents Department
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Kirsten-Boeing Propeller

Description: The advantages of the Kirsten-Boeing propeller consist essentially in the adjustability of the thrust in any desired direction, in the plane perpendicular to the axis of rotation of the system, and in its high efficiency. The propeller, which greatly resembles the paddle wheels used on river steamers, differs fundamentally from the latter, in that all the blades work simultaneously in the fluid medium (air or water).
Date: February 1926
Creator: Sachse, H.
Partner: UNT Libraries Government Documents Department
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Protection of wooden airplane parts against moisture by means of varnish

Description: The objects of the experiments herein described were to test the protection afforded by Valspar oil varnish against the absorption of moisture by wooden airplane parts and the consequent changes in their elastic properties and to compare some of the best Dutch varnishes with Valspar.
Date: February 1926
Creator: Wolff, E. B. & Van Ewijk, L. J. G.
Partner: UNT Libraries Government Documents Department
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Functioning of Reduction Gears on Airplane Engines

Description: "In undertaking to analyze the functioning conditions of a reduction gear on an aviation engine, we will consider an ordinary twelve-cylinder V-engine. The reduction gear employed consists either of a pair of spur gears, one of which is integral with the engine shaft and the other with the propeller shaft, or of a planetary system of gears" (p. 1).
Date: March 1926
Creator: Matteucci, Raffaelli
Partner: UNT Libraries Government Documents Department
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Recent Experiments With Large Seaplanes

Description: This report covers the following aspects of large seaplane design and construction: heavy wing loading; propeller design; how the motion of the airplane is affected by increasing the dihedral angle; power plants; floats; and the hull.
Date: March 1926
Creator: Rohrbach, Adolf
Partner: UNT Libraries Government Documents Department
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Slip Stream Effect

Description: "The horizontal tail surfaces of a new airplane usually are proportional so that the curve of moment about the center of gravity, combined with a similar curve for the wings alone, gives a composite curve which provides a certain specified degree of static stability. With the application of power three additional factors must be considered in calculations: the moment of the propeller thrust; the change in the velocity of the air over the tail due to the slipstream; and the change in direction o… more
Date: March 1926
Creator: Montieth, Charles N.
Partner: UNT Libraries Government Documents Department
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Flight Tests on Airplanes

Description: This report presents test procedures, methods, and instruments for flight testing of aircraft. Dynamic-pressure gauges are discussed at length.
Date: April 1926
Creator: Koppe, Heinrich
Partner: UNT Libraries Government Documents Department
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The fundamental principles of high-speed semi-diesel engines. Part 1: a general discussion of the subject of fuel injection in diesel engines and detailed descriptions of many types of injection nozzles

Description: Three questions relating to the technical progress in the utilization of heavy oils are discussed. The first question considers solid injection in high-speed automobile engines, the second concerns the development of the hot-bulb engine, and the third question relates to the need for a more thorough investigation of the processes on which the formatation of combustible, rapidly-burning mixtures depend.
Date: April 1926
Creator: Büchner
Partner: UNT Libraries Government Documents Department
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Mixing and Ignition in Supercharged Engines

Description: Memorandum presenting two principal methods of mixing for carburetor engines, one using a suction carburetor and the other using a pressure carburetor. An investigation of the spark plugs in the engines and how to design them so they can resist high levels of heat is also provided.
Date: April 1926
Partner: UNT Libraries Government Documents Department
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Experimental Investigation of the Physical Properties of Medium and Heavy Oils, Their Vaporization and Use in Explosion Engines Part 1

Description: While little has been accomplished in obtaining an abundant supply of light oils from coal and heavy oils, progress has been made on engine design to make use of the heavier oils. Progress has been made in two different directions which are outlined in this paper: the group of engines with medium and high-pressure carburetion in the cylinder; and the group of engines with low-pressure carburetion of the heavy oils before reaching the cylinder.
Date: May 1926
Creator: Heinlein, Fritz
Partner: UNT Libraries Government Documents Department
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Kinetographic Flow Pictures

Description: A method is presented for photographing the flow of fluids with a kinetograph.
Date: May 1926
Creator: Prandtl, L. & Tietjens, O.
Partner: UNT Libraries Government Documents Department
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Metal Airplane Construction

Description: It has long been thought that metal construction of airplanes would involve an increase in weight as compared with wood construction. Recent experience has shown that such is not the case. This report describes the materials used, treatment of, and characteristics of metal airplane construction.
Date: May 1926
Partner: UNT Libraries Government Documents Department
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Application of The "Magnus Effect" to the Wind Propulsion of Ships

Description: Report presenting an explanation of the Flettner wind-driven rotor ship and how it functions using the "Magnus effect". The advantages of the construction of this type of ship and the development of flow around the cylinder used to power it are described.
Date: June 1926
Creator: Prandtl, L.
Partner: UNT Libraries Government Documents Department
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Calculation of Combining Effects in the Structure of Airplane Wings: A Rational Basis for Estimating the Reduction in the Design Load on Wing Beams Due to the Influence of Ribs and Covering Toward Causing the Beams to Deflect Together

Description: This lecture concerns the combining effects in airplane wings so as to save some of the dead weight. Equations are provided in order to calculate some of the load characteristics and some of the effects to be considered.
Date: June 1926
Creator: Thalau, K.
Partner: UNT Libraries Government Documents Department
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