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  Partner: UNT Libraries Government Documents Department
 Decade: 1920-1929
 Year: 1924
 Collection: Technical Report Archive and Image Library
Aerodynamic characteristics of airfoils III : continuation of reports nos. 93 and 124

Aerodynamic characteristics of airfoils III : continuation of reports nos. 93 and 124

Date: 1924~
Creator: unknown
Description: This collection of data on airfoils has been made from the published reports of a number of the leading aerodynamic laboratories of this country and Europe. The information which was originally expressed according to the different customs of the several laboratories is here presented in a uniform series of charts and tables suitable for the use of designing engineers and for purposes of general reference. The absolute system of coefficients has been used, since it is thought by the National Advisory Committee for Aeronautics that this is the one most suited for international use and yet is one for which a desired transformation can be easily made. The authority for the results here presented is given as the name of the laboratory at which the experiments were conducted, with the size of the model, wind velocity, and date of test.
Contributing Partner: UNT Libraries Government Documents Department
The Aerodynamic Forces on Airship Hulls

The Aerodynamic Forces on Airship Hulls

Date: 1924
Creator: Munk, Max M
Description: This report describes the new method for making computations in connection with the study of rigid airship, which was used in the investigation of the navy's ZR-1 by the special subcommittee of the National Advisory Committee for Aeronautics appointed for this purpose. It presents the general theory of the air forces on airship hulls of the type mentioned, and an attempt has been made to develop the results from the very fundamentals of mechanics without reference to some of the modern highly developed conceptions, which may not yet be thoroughly known to readers uninitiated into modern aerodynamics, and which may, perhaps, for all time remain restricted to a small number of specialists.
Contributing Partner: UNT Libraries Government Documents Department
The Aerodynamic Laboratory of the Belgian Service Technique de L'Aeronautique

The Aerodynamic Laboratory of the Belgian Service Technique de L'Aeronautique

Date: December 1924
Creator: unknown
Description: This report provides a description of the wind tunnel housing and motors.
Contributing Partner: UNT Libraries Government Documents Department
The aerodynamic plane table

The aerodynamic plane table

Date: 1924?~
Creator: Zahm, A F
Description: This report gives the description and the use of a specially designed aerodynamic plane table. For the accurate and expeditious geometrical measurement of models in an aerodynamic laboratory, and for miscellaneous truing operations, there is frequent need for a specially equipped plan table. For example, one may have to measure truly to 0.001 inch the offsets of an airfoil at many parts of its surface. Or the offsets of a strut, airship hull, or other carefully formed figure may require exact calipering. Again, a complete airplane model may have to be adjusted for correct incidence at all parts of its surfaces or verified in those parts for conformance to specifications. Such work, if but occasional, may be done on a planing or milling machine; but if frequent, justifies the provision of a special table. For this reason it was found desirable in 1918 to make the table described in this report and to equip it with such gauges and measures as the work should require.
Contributing Partner: UNT Libraries Government Documents Department
Aeronautic instruments

Aeronautic instruments

Date: February 1924
Creator: Koppe, H & Everling, E
Description: The development of aeronautic instruments. Vibrations, rapid changes of the conditions of flight and of atmospheric conditions, influence of the air stream all call for particular design and construction of the individual instruments. This is shown by certain examples of individual instruments and of various classes of instruments for measuring pressure, change of altitude, temperature, velocity, inclination and turning or combinations of these.
Contributing Partner: UNT Libraries Government Documents Department
Air-flow experiments

Air-flow experiments

Date: May 1924
Creator: Wieselsberger, C
Description: This report describes the apparatus used to take air-flow photographs. The photographs show chiefly the spiral course of the lines of flow near the tip of the wing. They constitute therefore a visual presentation of the phenomena covered by airfoil theory.
Contributing Partner: UNT Libraries Government Documents Department
Air Forces Exerted on Streamlined Bodies with Round or Square Cross- Sections, When Placed Obliquely to the Airstream

Air Forces Exerted on Streamlined Bodies with Round or Square Cross- Sections, When Placed Obliquely to the Airstream

Date: June 1924
Creator: Wieselsberger, C
Description: The question of behavior of a streamlined body with round or square cross-sections is of importance in determining the shape to give an airplane fuselage. It is our task here to show how the lift and drag are affected, with the object placed obliquely to the air stream.
Contributing Partner: UNT Libraries Government Documents Department
Air transport

Air transport

Date: January 1, 1924
Creator: Page, F Handley
Description: I purpose (sic) in this paper to deal with the development in air transport which has taken place since civil aviation between England and the Continent first started at the end of August 1919. A great deal of attention has been paid in the press to air services of the future, to the detriment of the consideration of results obtained up to the present.
Contributing Partner: UNT Libraries Government Documents Department
Airplanes in horizontal curvilinear flight

Airplanes in horizontal curvilinear flight

Date: January 1924
Creator: Kann, Heinrich
Description: War airplanes require not only high speed and the ability to climb rapidly, but also the ability to transverse sharp curves quickly. Here, an attempt is made to give a simple method of calculating horizontal curvilinear flight. A method for determining the area of the aileron and rubber surfaces are also indicated. The discussion given here applies primarily to single and two-seater airplanes, although it can be extended to larger airplanes.
Contributing Partner: UNT Libraries Government Documents Department
An airship slide rule

An airship slide rule

Date: 1924?~
Creator: Weaver, E. R. & Pickering, S. F.
Description: This report prepared for the National Advisory Committee for Aeronautics, describes an airship slide rule developed by the Gas-Chemistry Section of the Bureau of Standards, at the request of the Bureau of Engineering of the Navy Department. It is intended primarily to give rapid solutions of a few problems of frequent occurrence in airship navigation, but it can be used to advantage in solving a great variety of problems, involving volumes, lifting powers, temperatures, pressures, altitudes and the purity of the balloon gas. The rule is graduated to read directly in the units actually used in making observations, constants and conversion factors being taken care of by the length and location of the scales. It is thought that with this rule practically any problem likely to arise in this class of work can be readily solved after the user has become familiar with the operation of the rule; and that the solution will, in most cases, be as accurate as the data warrant.
Contributing Partner: UNT Libraries Government Documents Department
The American airship ZR-3

The American airship ZR-3

Date: November 1, 1924
Creator: Durr, L
Description: This airship was built by the Zeppelin Airship Company at Friedrichshafen in 1923-4, for the United States Navy, as the reparations service of the German Government in fulfillment of the treaty of peace.
Contributing Partner: UNT Libraries Government Documents Department
The analysis of free flight propeller tests and its application to design

The analysis of free flight propeller tests and its application to design

Date: 1924?~
Creator: Munk, Max M
Description: This report contains a description of a new and useful method suitable for the design of propellers and for the interpretation of tests with propellers. The fictitious slipstream velocity, computed from the absorbed horsepower, is plotted against the relative slip velocity. It is discussed in detail how this velocity is obtained, interpreted, and used. The methods are then illustrated by applying them to model tests and to free flight tests with actual propellers.
Contributing Partner: UNT Libraries Government Documents Department
Analysis of W. F. Durand's and E. P. Lesley's propeller tests

Analysis of W. F. Durand's and E. P. Lesley's propeller tests

Date: 1924?~
Creator: Munk, Max M
Description: This report is a critical study of the results of propeller model tests with the view of obtaining a clear insight into the mechanism of the propeller action and of examining the soundness of the physical explanation generally given. The nominal slip-stream velocity is plotted against the propeller tip velocity, both measured by the velocity of flight as a unit. Within the range corresponding to conditions of flight, the curve thus obtained is a straight line. Its inclination depends chiefly on the effective blade width, its position on the effective pitch. These two quantities can therefore be determined from the result of each propeller test. Both can easily be estimated therefrom for new propellers of similar type. Thus, a simple method for the computation of propellers suggests itself.
Contributing Partner: UNT Libraries Government Documents Department
Annual report of the National Advisory Committee for Aeronautics (9th).administrative report including Technical Reports nos. 159 to 185

Annual report of the National Advisory Committee for Aeronautics (9th).administrative report including Technical Reports nos. 159 to 185

Date: 1924
Creator: unknown
Description: Report includes the National Advisory Committee for Aeronautics letter of submittal to the President, Congressional report, summaries of the committee's activities and research accomplished, and expenditures.
Contributing Partner: UNT Libraries Government Documents Department
Aviation engines in the endurance contest

Aviation engines in the endurance contest

Date: December 1924
Creator: Lehr, G
Description: The contest for engines of great endurance had entries of 13 types by the following firms: Breguet, Farman, Fiat, Hispano-Suiza, Lorraine-Dietrich, Panhard-Levassor, Peugeot, Renault, and Salmson.
Contributing Partner: UNT Libraries Government Documents Department
Balloon flight and atmospheric electricity

Balloon flight and atmospheric electricity

Date: July 1, 1924
Creator: Herrera, Emilio
Description: The air is known to be charged with electricity (chiefly positive) with reference to the earth, so that its potential increases with the altitude and the difference in potential between two points in the same vertical line, divided by the distance between them, gives a value called the "potential gradient," which may vary greatly with the altitude, the nature of the ground and the atmospheric conditions.
Contributing Partner: UNT Libraries Government Documents Department
Calculation of the hull and of the car-suspension systems of airships

Calculation of the hull and of the car-suspension systems of airships

Date: October 1, 1924
Creator: Verduzio, R
Description: Differential and integral curves are presented and well as numerous calculations relating to hulls. Some of the calculations include those relating to hulls, those relating to the invariability of the shape of the hulls, and those relating to the suspension of the hull.
Contributing Partner: UNT Libraries Government Documents Department
The cathode oscillograph for the study of low, medium, and high frequencies

The cathode oscillograph for the study of low, medium, and high frequencies

Date: April 1, 1924
Creator: Dufour, A
Description: The object of this work has been to construct an apparatus for obtaining oscillogram of voltages and currents which are variable with respect to time and of the frequency which is constantly met in radio.
Contributing Partner: UNT Libraries Government Documents Department
Central District Bituminous Coals as Water-Gas Generator Fuel

Central District Bituminous Coals as Water-Gas Generator Fuel

Date: 1924
Creator: Odell, W. W. & Dunkley, W. A.
Description: From Introduction Scope of Investigation: "The purpose of the present paper is to discuss, in some detail, the principles involved in water-gas manufacture as they apply to the use of bituminous generator fuel; and to discuss in more detail the results obtained in the Streator tests and the application in other plants of the operating methods."
Contributing Partner: UNT Libraries Government Documents Department
Coal-Mine Fatalities in the United States, 1923

Coal-Mine Fatalities in the United States, 1923

Date: 1924
Creator: Adams, William W.
Description: Report compiled by the U.S. Bureau of Mines including statistics on fatalities in coal mines located in the United States as well as data regarding the various operations (e.g., number of miners employed and average production). The information is organized into tables for comparison and the text draws some overall conclusions in the summary.
Contributing Partner: UNT Libraries Government Documents Department
Coal-Mining Problems in the State of Washington

Coal-Mining Problems in the State of Washington

Date: 1924
Creator: Evans, George Watkin
Description: From Introduction: "On account of extensive folding and faulting of the coal measures, mining in Washington presents many difficulties; therefore a description of the methods employed at some of the mines may be useful in planning operations in other regions, and is presented in this bulletin."
Contributing Partner: UNT Libraries Government Documents Department
Combustion of liquid fuels in diesel engine

Combustion of liquid fuels in diesel engine

Date: October 1, 1924
Creator: Alt, Otto
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.
Contributing Partner: UNT Libraries Government Documents Department
Comparing the performance of geometrically similar airplanes

Comparing the performance of geometrically similar airplanes

Date: April 1, 1924
Creator: Munk, Max M & Warner, Edward P
Description: This note has been prepared for the National Advisory Committee for Aeronautics. It deals with the model rules relating to aeronautical problems, and shows how the characteristics of one airplane can be determined from those of another airplane of different weight or size, and of similar type. If certain rules for the ratios of the dimensions, the weights and the horsepower are followed, a small low-powered airplane can be used for obtaining information as to performance, stability, controllability and maneuverability of a larger prototype, and contrariwise.
Contributing Partner: UNT Libraries Government Documents Department
Complete study of longitudinal oscillation of a VE-7 airplane

Complete study of longitudinal oscillation of a VE-7 airplane

Date: January 1, 1924
Creator: Norton, F H & Brown, W G
Description: This investigation was carried out by the National Advisory Committee for Aeronautics at Langley Field in order to study as closely as possible the behavior of an airplane when it was making a longitudinal oscillation. The airspeed, the altitude, the angle with the horizon and the angle of attack were all recorded simultaneously and the resulting curves plotted to the same time scale. The results show that all the curves are very close to damped sine curves, with the curves for height and angle of attack in phase, that for angle with the horizon leading them by 18 per cent and that for path angle leading them by 25 per cent.
Contributing Partner: UNT Libraries Government Documents Department
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