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Combustion of Liquid Fuels in Diesel Engine

Description: Hitherto, definite specifications have always been made for fuel oils and they have been classified as more or less good or non-utilizable. The present aim, however, is to build Diesel engines capable of using even the poorest liquid fuels and especially the waste products of the oil industry, without special chemical or physical preparation.
Date: October 1924
Creator: Alt, Otto
Partner: UNT Libraries Government Documents Department
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Langley Field wind tunnel apparatus

Description: From Summary: "The difficulties experienced in properly holding thin tipped or tapered airfoils while testing on an N.P.L. type aerodynamic balance even at low air speeds, and the impossibility of holding even solid metal models at the high speeds attainable at the National Advisory Committee's wind tunnel, necessitated the design of a balance which would hold model airfoils of any thickness and at speeds up to 150 m.p.h. In addition to mechanical strength and rigidity, it was highly desirable that the balance readings should require a minimum amount of correction and mathematical manipulation in order to obtain the lift and drag coefficients and the center of pressure. The balance described herein is similar to one in use at the University of Gottingen, the main difference lying in the addition of a device for reading the center of pressure directly, without the necessity of any correction whatsoever. Details of the design and operation of the device are given."
Date: October 1921
Creator: Bacon, D. L.
Partner: UNT Libraries Government Documents Department
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Wind Tunnel Tests on an Airfoil Equipped With a Split Flap and a Slot

Description: "The investigation described in this report is concerned with the changes in the aerodynamic characteristics of an airfoil which are produced by a gauze-covered suction slot, located near the leading edge, and connected by an air passage to a split flap at the trailing edge. The tests were conducted at the Langley Memorial Aeronautical Laboratory. At the larger values of lift coefficient where the action of the slot might be expected to be most effective, the pressure differences were such that the air flowed out of the slot rather than in through it, and in consequence, the maximum lift coefficient was decreased" (p. 1).
Date: October 1929
Creator: Bamber, Millard J.
Partner: UNT Libraries Government Documents Department
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Duralumin, Its Properties and Uses

Description: A historical sketch of duralumin is presented, especially in regards to its manufacture by various countries. The properties of duralumin are discussed and strength characteristics listed. Increasing the hardness of duralumin by tempering is discussed as well as the uses of the metal.
Date: October 1924
Creator: Beck, R.
Partner: UNT Libraries Government Documents Department
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[Memorandums on the Subject of Joukowski Wings]

Description: In the first article, in connection with a lecture on the hydrodynamic basis of flight and the potential flow about a Joukowski wing, the pressure distribution on several wings is computed and plotted. The diagrams of the pressure distributions are presented accompanied with a qualitative discussion of the pressure distribution. In the second article, the the cross-sectional outline (or profile) a Joukowski wing are plotted.
Date: October 1925
Creator: Blumenthal, Otto & Trefftz, E.
Partner: UNT Libraries Government Documents Department
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Pressure Distribution on Joukowski Wings

Description: The hydrodynamics and mathematical models as applied to the potential flow about a Joukowski wing are presented.
Date: October 1925
Creator: Blumenthal, Otto & Trefftz, E.
Partner: UNT Libraries Government Documents Department
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Spindled and Hollow Spars

Description: "The most usual method of arriving at the maximum amount of spindling or hollowing out permissible in the case of any particular spar section is by trial and error, a process which is apt to become laborious in the absence of good guessing - or luck. The following tables have been got out with the object of making it possible to arrive with certainty at a suitable section at the first attempt" (p. 1).
Date: October 1926
Creator: Blyth, J. D.
Partner: UNT Libraries Government Documents Department
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Treatment of the Tungsten Ores of Boulder County, Colo.

Description: Report discussing the the development of milling practice in Boulder County, the ore-dressing methods in use, and the local manufacture of ferrotungsten and tungstic oxide. Figures giving the production of tungsten concentrates in the Boulder district, in the United States, and in the world; data on the buying of tungsten ores; costs of production; and the normal tungsten requirements in this country are presented.
Date: October 1921
Creator: Bonardi, J. P. & Williams, J. C.
Partner: UNT Libraries Government Documents Department
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The Synchronization of NACA Flight Records

Description: "A method is described for synchronizing the different instrument records taken during flight testing. This method has been in use for sometime at the Langley Memorial Aeronautical Laboratory and has proved very valuable in connection with the study of controllability and other complicated problems of flight" (p. 1).
Date: October 1922
Creator: Brown, W. G.
Partner: UNT Libraries Government Documents Department
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Mooring Airships

Description: The purpose of this paper is to summarize the present status of the problem of mooring airships. Mooring with one, two and even three cables are all discussed.
Date: October 1924
Creator: Crocco, G. A.
Partner: UNT Libraries Government Documents Department
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Inherent Stability of Helicopters

Description: The equilibrium, in still air, of a "stationary" helicopter (i.e., of one having neither vertical nor translational velocity, but a tendency to remain practically motionless within restricted limits of space) presents some difficulty in practice and justifies a theoretical investigation of its "inherent stability," i.e., independent of the pilot.
Date: October 1923
Creator: Crocco, G. Arturo
Partner: UNT Libraries Government Documents Department
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The Logarithmic Polar Curve - Its Theory and Application to the Predetermination of Airplane Performance

Description: "The logarithmic polar curve has for several years been used by the most prominent aerodynamical laboratories as well as by airplane manufacturers in Europe. To show more clearly the practical application of the polar curve, a series of examples are given with suggestions for solution. After a discussion of the theory and the practical application of the polar curve, the following problems are discussed: climbing flight, speed at various altitudes, and the characteristics of two seater observation airplanes of recent design" (p. 1).
Date: October 1924
Creator: Cronstedt, Val
Partner: UNT Libraries Government Documents Department
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F-5-L boat seaplane: Comparative performance with direct and geared engines

Description: Comprehensive tests were made to compare the performance of the F-5-L Boat Seaplane fitted with direct drive and Liberty engines. Details are given on the test conditions. The conclusions of the comparison tests follow. 1) An F-5-L with geared engines takes off in approximately 90 percent of the time required for the same airplane with standard direct drive engines. An F-5-L with geared engines climbs in 20 minutes to an altitude approximately 20 percent greater than that obtained with the standard direct drive on the same airplane.
Date: October 1922
Creator: Diehl, W. S.
Partner: UNT Libraries Government Documents Department
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F-5-L Boat Seaplane: performance characteristics

Description: Performance characteristics for the F-5-L Boat Seaplane are given. Characteristic curves for the RAF-6 airfoil and the F-5-L wings, parasite resistance and velocity data, engine and propeller characteristics, effective and maximum horsepower, and cruising performance are discussed.
Date: October 1922
Creator: Diehl, W. S.
Partner: UNT Libraries Government Documents Department
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Slotted-Wing Airplanes

Description: Different applications of the slotted-wing principle are discussed as well as the advantages of using them. Slotted-wings are provided as a promising solution to the problem of needing to increase flight speed for aircraft while also decreasing landing speed.
Date: October 1927
Creator: Everling, E.
Partner: UNT Libraries Government Documents Department
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Fittings and Other Structural Parts of Airplanes

Description: "The strength and reliability of airplanes depend greatly on the careful design and manufacture of fittings, couplings, and other highly stressed parts. The more important parts of the airplane must be occasionally tested for increased loads and in order to avoid the possibility of defects creeping in during subsequent production. Strength tests are discussed for fittings for wing spar joints, fittings for strut connections, internal bracing, control gear, and landing gear" (p. 1).
Date: October 1923
Creator: Eydam, P.
Partner: UNT Libraries Government Documents Department
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Experiments With Rotating Cylinders in Combination With Airfoils

Description: Memorandum presenting an investigation of whether rotating cylinders can be advantageously used in combination with airfoils in airplane construction.
Date: October 1926
Creator: Frey, Kurt
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
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
Partner: UNT Libraries Government Documents Department
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Tin Soldering of Aluminum and Its Alloys

Description: A method is presented for soldering aluminum to other metals. The method adopted consists of a galvanic application to the surface of the light-metal parts to be soldered, of a layer of another metal, which, without reacting electrolytically on the aluminum, adheres strongly to the surface to which it is applied, and is, on the other hand, adapted to receive the soft solder. The metal found to meet the criteria best was iron.
Date: October 1921
Creator: Gallo, Gino
Partner: UNT Libraries Government Documents Department
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Recovery of Gold from Black Sand Tailings

Description: Report on the recovery of gold from black sand tailings, based on tests conducted at the U.S. Bureau of Mines' Alaska Station.
Date: October 1920
Creator: Gross, John
Partner: UNT Libraries Government Documents Department
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Glider Construction and Design

Description: The endeavor to draw a strict line between gliders and soarers as been recently abandoned and the following classification adopted: 1) gliders controlled by shifting the weight of the body; 2) gliders controlled by rudders; 3) gliders controlled by wings. The different classes are discussed as well as materials and parts used in construction.
Date: October 1927
Creator: Gymnich, Alfried
Partner: UNT Libraries Government Documents Department
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Some German Gliders of 1920-1923

Description: Memorandum presenting a review of some of the German gliders produced from 1920-1923. The designs, flight characteristics, and descriptions of successful flights are provided.
Date: October 1927
Creator: Gymnich, Alfried
Partner: UNT Libraries Government Documents Department
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