Technical Report Archive & Image Library (TRAIL) - 50 Matching Results

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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.
Item Type: Refine your search to only Report
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
Item Type: Refine your search to only Report
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.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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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

Description: 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 s… more
Date: September 1925
Creator: Kuehn
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Atomization of Liquid Fuels Part 2: Description of Apparatus, Fuels Tested, Atomization Experiments, Discharge Measurements, Atomization

Description: This report describes the design and operation of a nozzle to inject fuel into an engine. The design of the nozzle is open, without any compulsory or automatic stop-valve. The fuel injection is regulated simply by the pressure and the adjustment of the fuel pump.
Date: September 1925
Creator: Kuehn, R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Atomization of Liquid Fuels Part 3: Critical Discussion of Experimental Reesults, Mixing the Atomized Fuel with Air

Description: 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.
Item Type: Refine your search to only Report
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
Item Type: Refine your search to only Report
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.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Concrete Airship Sheds at Orly, France Part 1: General Aspect of the Problem, Basic Principles of the Final Project, Principal Structural Elements

Description: This report details the contest to design and build concrete airship hangers. The difficulty lies in the magnitude of the absolute dimensions. An airship shed must withstand two principal types of stresses: those resulting from its own weight and those due to the wind. This report discusses both problems in detail.
Date: October 1925
Creator: Freyssinet
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Concrete Airship Sheds at Orly, France Part 2: Supporting Structure and Method of Moving, Mechanism for Moving the Centering, Apparatus for Handling the Materials, Remarks on Construction Details

Description: This report deals mainly with the methods of construction employed when after the plan had been approved. The foundation, side walls, doors and roof are all discussed and the economic savings resulting from this method of construction.
Date: October 1925
Creator: Freyssinet
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Determination of Ignition Points of Liquid Fuels Under Pressure

Description: Two series of experiments were tried, in order to determine the ignition point at any desired pressure, the first series at constant and the second at varying pressure. The results differ greatly and indicate that testing under pressure, in the investigation of liquid fuels, can be done best in the laboratory and that the determination of the ignition points in an open vessel furnishes no certain indication of the behavior of the fuel in the engine.
Date: January 1925
Creator: Tausz, J. & Schulte, F.
Item Type: Refine your search to only Report
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
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Experimental Determination of Pressure Drop Caused by Wire Gauze in an Air Stream

Description: "For several kinds of wire gauze the difference in static, dynamic and total or absolute pressure in front of and behind the gauze were determined for comparison with the pressure drop caused by an airplane radiator, such gauze being used on airplane models to represent the radiator" (p. 1).
Date: January 1925
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Hesselman Heavy-Oil High-Compression Engine

Description: Memorandum presenting a description of the Hesselman heavy-oil high-compression engine, which is meant to solve many of the problems associated with standard diesel engines. Specific details of the fuel pump, fuel valve, spraying, and process by which the engine functions are provided.
Date: April 1925
Creator: Hesselman, K. J. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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High Velocity Wind Tunnels: Their Application to Ballistics, Aerodynamics, and Aeronautics

Description: "The object of this article is to set forth the particular properties of swiftly-moving air, how these affect the installation of a wind tunnel, the experimental results already obtained, the possible applications of such a tunnel, and what can be easily accomplished at the present time" (p. 1).
Date: June 1925
Creator: Huguenard, E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Hulls for Large Seaplanes

Description: "In reality, the principle of similitude is not applicable to the hulls, the designing of which increases in difficulty with increasing size of the seaplanes. In order to formulate, at least in a general way, the basic principles of calculation, we must first summarize the essential characteristics of a hull with reference to its gradual enlargement. In this study, we will disregard hulls with wing stubs, as being inapplicable to large seaplanes" (p. 2).
Date: January 1925
Creator: Magaldi, Giulio
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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An Introduction to the Helicopter

Description: It is the object of this report to review briefly the aerodynamic and construction data already available regarding helicopters and to set forth the difficulties which must be met.
Date: 1925
Creator: Klemin, Alexander
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Latécoère Air Lines

Description: This article presents the observations of the authors on an inspection trip of the Latecoere Air Lines routes from Southern France into North Africa.
Date: August 1925
Creator: Van Zandt, J. Parker
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Law of Similitude for the Surface Resistance of Lacquered Planes Moving in a Straight Line Through Water

Description: The proof of the validity of the Reynolds law of similitude for the surface resistance of planes has been developed with an accuracy hitherto unattained and for a large range of lengths and speeds. It has been shown that, in addition to the form resistance, the resistance of the longitudinal edges must be taken into account.
Date: April 1925
Creator: Gebers, Friedrich
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Light Aeroplane Engine Development

Description: "It has frequently been stated and written that in order to popularize light aircraft the first essential is the production of a reliable engine capable of being easily maintained and having a long life, at the same time selling at a low figure. It is desired to point out the difficulties in the way of realizing this ideal before remarking on the claims of the various types for adoption" (p. 1).
Date: April 1925
Creator: Fell, L. F. R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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