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Model Tests on the Economy and Effectiveness of Helicopter Propellers

Description: The average velocity of helicopter blades relative to the air is greater than that of airplane wings. The helicopter may turn out to be more economical than the airplane wing for extreme velocities of horizontal flight, the airplane then requiring a very great speed range.
Date: 1925
Creator: Munk, Max M.
Partner: UNT Libraries Government Documents Department
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Wind Tunnel Tests of Fuselages and Windshields

Description: "The tests described herein were made in 1918, in the old four-foot wind tunnel at the Massachusetts Institute of Technology and at the request of the Engineering Division of the U.S. Army Air Service. The results were given circulation only in official circles at that time. The interest of the work appears sufficient to justify its wider distribution even at this very late date" (p. 1).
Date: September 1925
Creator: Warner, Edward P.
Partner: UNT Libraries Government Documents Department
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Determination and Classification of the Aerodynamic Properties of Wing Sections

Description: The following note, prepared for the NACA, contains several remarks on the possible improvement of the experimental determination of the aerodynamic properties of wing sections. It shows how errors of observation can subsequently be partially eliminated, and how the computation of the maxima or minima of aerodynamic characteristics can be much improved.
Date: September 1925
Creator: Munk, Max M.
Partner: UNT Libraries Government Documents Department
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The Flettner Rotor Ship in the Light of the Kutta-Joukowski Theory and of Experimental Results

Description: "In this paper the fundamental principles of the Flettner rotor ship (Reference I) are discussed in the light of the Kutta-Joukowski theory and available experimental information on the subject. A brief exposition of the Kutta-Joukowski theory is given and the speed of the rotor ship Buckau computed, first by using effective propulsive force obtained by the above theory, and then by direct application of wind tunnel data" (p. 1).
Date: October 1925
Creator: Rizzo, Frank
Partner: UNT Libraries Government Documents Department
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An Altitude Chamber for the Study and Calibration of Aeronautical Instruments

Description: "The design and construction of an altitude chamber, in which both pressure and temperature can be varied independently, was carried out by the NACA at the Langley Memorial Aeronautical Laboratory for the purpose of studying the effects of temperature and pressure on aeronautical research instruments. Temperatures from +20c to -50c are obtained by the expansion of CO2from standard containers. The chamber can be used for the calibration of research instruments under altitude conditions simulatin… more
Date: November 1925
Creator: Reid, H. J. E. & Kirchner, Otto E.
Partner: UNT Libraries Government Documents Department
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Simplified Propeller Design for Low-Powered Airplanes

Description: "The object of this report is to furnish the designer and builder of small airplanes a simple system for designing the propeller and making the drawing. An empirical design method is used, based on tests of model propellers in a wind tunnel and full scale tests of propellers in flight. The actual designing is accomplished by means of charts and involves very little calculation" (p. 1).
Date: January 1925
Creator: Weick, Fred E.
Partner: UNT Libraries Government Documents Department
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Discharge Characteristics of a High Speed Fuel Injection System

Description: Discussed here are some discharge characteristics of a fuel injection system intended primarily for high speed service. The system consisted of a cam actuated fuel pump, a spring loaded automatic injection valve, and a connecting tube.
Date: February 1925
Creator: Matthews, Robertson
Partner: UNT Libraries Government Documents Department
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Note on the Katzmayr Effect on Airfoil Drag

Description: The reduction of drag of an airfoil when the air stream is oscillating is called the Katzmayr effect. The purpose here is to offer a simple explanation of the cause of the Katzmayr effect.
Date: February 1925
Creator: Ober, Shatswell
Partner: UNT Libraries Government Documents Department
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The "Navigraph"

Description: "Commander Le Prieur, whose flight experience in a low-speed seaplane we related in our number of September 27, 1924, invented, four years ago, an instrument destined to render very great service to aviators, namely, the "navigraph", designed to correct errors of orientation due to the effect of the winds during flight" (p. 1).
Date: June 1925
Creator: Le Prieur, Ives
Partner: UNT Libraries Government Documents Department
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Increasing the Power of Internal Combustion Engines

Description: This report presents various methods for increasing the power of engines such as supercharging and turbocharging.
Date: July 1925
Creator: Prayer, Georg
Partner: UNT Libraries Government Documents Department
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Airplane Parachutes

Description: The "Bulletin Technique", of March, 1919, gave the results of tests and studies made up to that date in connection with airplane parachutes. This work has been continued.
Date: August 1925
Creator: Mazer
Partner: UNT Libraries Government Documents Department
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Recent experiments at the Gottingen Aerodynamic Institute

Description: This report presents the results of various experiments carried out at the Gottingen Aerodynamic Institute. These include: experiments with Joukowski wing profiles; experiments on an airplane model with a built-in motor and functioning propeller; and the rotating cylinder (Magnus Effect).
Date: July 1925
Creator: Ackeret, J.
Partner: UNT Libraries Government Documents Department
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Relation Of "Lilienthal Effect" to Dynamic Soaring Flight

Description: "In this article, the phenomena of the upward component in the case of flat surfaces will be referred to as the "Lilienthal effect." The Lilienthal effect will be distinguished from the Knoller-Betz effect which is explained by means of vertical wind oscillations, at the basis of which, however, there lie air motions which the Lilienthal effect could not produce. It will be shown that the same cause, which can produce the Lilienthal effect on flat airfoils, considerably strengthens the thrust d… more
Date: July 1925
Creator: Fick, Roderich
Partner: UNT Libraries Government Documents Department
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Computation of Cantilever Airplane Wings

Description: The purpose of this treatise is, first of all, the determination of the effect of variously loaded spars on one another, since the neglect of this effect would present an economically very unfavorable computation method. The system of spars and cross-bars alone (whether solid or built-up) does not matter at first, the original assumption being that the spars are rigidly braced by the cross-bars.
Date: July 1925
Creator: Thalau, K.
Partner: UNT Libraries Government Documents Department
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The Problem of Fuel Measurement: The Schiske "Konsummeter"

Description: Any measuring device, which immediately indicates the rate of fuel consumption in the desired units, has the advantage of saving considerable time and fuel, besides facilitating the adjustment of the carburetor. The Schiske "Konsummeter" (made by the "PS-Vergaser and Apparatebau A. G.") was designed from the above viewpoint.
Date: May 1925
Creator: Praetorius, K. R. H.
Partner: UNT Libraries Government Documents Department
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European Commercial Aeronautics

Description: "During the months of June to September, 1924, I personally visited the principal airports of Europe and traveled as a passenger some 6500 air miles on English, French, Romanian, Polish, German and Dutch air lines in order to investigate the development of commercial aviation abroad. The results of the investigation are embodied in a series of reports, of which a summary of the general findings is given below" (p. 1).
Date: May 1925
Creator: Van Zandt, J. Parker
Partner: UNT Libraries Government Documents Department
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Air forces on airfoils moving faster than sound

Description: We are undertaking the task of computing the air forces on a slightly cambered airfoil in the absence of friction and with an infinite aspect ratio. We also assume in advance that the leading edge is very sharp and that its tangent lies in the direction of motion.
Date: June 1925
Creator: Ackeret, J.
Partner: UNT Libraries Government Documents Department
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Alloys Similar to Duralumin Made in Other Countries Than Germany

Description: Attempts by other countries to develop patents for alloys similar to duralumin are presented. Duralumin is aluminum alloyed with 3.5-4.5% copper, 0.5% magnesium, and 0.25-1% of manganese. A description of various materials that some have attempted to patent are provided.
Date: May 1925
Creator: Meissner, K. L.
Partner: UNT Libraries Government Documents Department
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Effect of Speed on Economy of Airship Traffic

Description: The economic costs and benefits of speed on airship traffic are calculated and different factors are considered.
Date: February 1925
Creator: Bleistein, W.
Partner: UNT Libraries Government Documents Department
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Pitot-Static Tubes for Determining the Velocity of Air

Description: On the occasion of the formulation of the rules for testing the efficiency of ventilators and compressors, experiments were instituted by the subcommittee on ventilators for the production of suitable tubes for velocity and pressure measurements.
Date: February 1925
Creator: Kumbruch, H.
Partner: UNT Libraries Government Documents Department
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Calculation of Wing Spars of Variable Cross-Section and Linear Load

Description: "The calculation of wing spars of constant cross-section and load has been thoroughly treated by a large number of authors. Such is not the case,however, regarding the calculation of wing spars whose section and linear load diminish toward the ends, as in wings of trapezoidal contour and decreasing section" (p. 1).
Date: March 1925
Creator: Kirste, Léon
Partner: UNT Libraries Government Documents Department
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Altitude of equilibrium of an airship

Description: This report details the procedure followed in establishing a general formula enabling the calculation of the maximum altitude attainable statically.
Date: March 1925
Creator: Nobile, Umberto
Partner: UNT Libraries Government Documents Department
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Preliminary investigation of the effect of a rotating cylinder in a wing

Description: Into the leading edge of a wing with arbitrary cross-section, there is introduced a cylinder, which can be rotated by an electric motor by means of a cord. Observations were made in the wind tunnel on how the lift at different wind velocities was affected by rotating this cylinder.
Date: March 1925
Creator: Wolff, E. B.
Partner: UNT Libraries Government Documents Department
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