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Partner:
UNT Libraries Government Documents Department
Decade:
1920-1929
Serial/Series Title:
NACA Technical Memorandums
Collection:
National Advisory Committee for Aeronautics Collection
- The 1000 HP traffic airplane of the Zeppelin Works in Staaken
- No Description digital.library.unt.edu/ark:/67531/metadc53613/
- The 1926 German seaplane contest
- The report discusses the problem of rating the various seaplane designs from the 1926 seaplane contest. The whole process of rating consists in measuring the climbing speed, flying weight and carrying capacity of a seaplane and then using these data as the basis of a construction problem. digital.library.unt.edu/ark:/67531/metadc65292/
- Abacus for the reduction of English measures to the metric system and vice versa
- This report presents a description of the abacus as well as construction details. There is also a detailed description on how to use the abacus. digital.library.unt.edu/ark:/67531/metadc53628/
- Abacus giving the variation of the mean pressure of an aviation engine as a function of its speed of rotation
- Comparing the results of the calculations for computing the mean pressure of an aviation engine for any number of revolutions, with those of experiment, the writer, by numerous examples, shows the perfect agreement between them. This report will show that, by means of a special abacus, an engineer can instantly plot the characteristics of an engine. digital.library.unt.edu/ark:/67531/metadc53605/
- Absorbing landing shocks
- Tires, steel springs, hydraulic shock absorbers, and axle travel are all examined in relation to absorbing landing shocks. digital.library.unt.edu/ark:/67531/metadc56246/
- Aerial convention of October 13, 1919
- The aerial convention delegates are listed as well as the set of rules that were developed during the session. digital.library.unt.edu/ark:/67531/metadc55281/
- Aerial navigation by dead reckoning
- The problem to be solved, as presented to the pilot or observer of an aircraft, is as follows: The aircraft starting from A must land at B, the only data being the speed of the airplane, the altitude and the orientation D of the course. The above data would be amply sufficient, were it not for the fact that the airplane is constantly subjected to a wind of variable direction and strength. digital.library.unt.edu/ark:/67531/metadc55696/
- Aerial navigation : on the problem of guiding aircraft in a fog or by night when there is no visibility
- The use of magnetic fields and wire to navigate aircraft in conditions of poor visibility is presented. This field may be considered to be derived from a double lemniscate, considered in the particular case where the origin is a double point formed from the magnetic field of the slack wire, from the field produced by the return currents and from the field due to the currents induced in the conducting mass. These fields are dephased in two ways, one in the direction of the wire, the other in a direction perpendicular to it. digital.library.unt.edu/ark:/67531/metadc53657/
- Aerial transportation
- The origin of air traffic dates from the war. The important development of aeronautic industries and the progress made in recent years, under the impelling force of circumstances, rendered it possible, after the close of hostilities, to consider the practical utilization of this new means of economic expansion. digital.library.unt.edu/ark:/67531/metadc53663/
- Aero dopes and varnishes
- Before proceeding to discuss the preparation of dope solutions, it will be necessary to consider some of the essential properties which should be possessed of a dope film, deposited in and on the surface of an aero fabric. The first is that it should tighten the material and second it should withstand weathering. digital.library.unt.edu/ark:/67531/metadc65251/
- Aerodynamic characteristics of thin empirical profiles and their application to the tail surfaces and ailerons of airplanes
- No Description digital.library.unt.edu/ark:/67531/metadc65343/
- Aerodynamic computation of gliders
- In the following discussion, a knowledge of the theoretical principles of airplane construction is assumed, as presented in detail by Vogt and Lippisch. A few quantities will however be otherwise designated, in accordance with the Gottingen symbols. digital.library.unt.edu/ark:/67531/metadc55788/
- Aerodynamic laboratory at Cuatro Vientos
- This report presents a description of the design of the Cuatro Vientes wind tunnel. digital.library.unt.edu/ark:/67531/metadc65237/
- Aerodynamic laboratory at Cuatro Vientos
- This report presents a listing of the many experiments in aerodynamics taking place at Cuatro Vientos. Some of the studies include: testing spheres, in order to determine coefficients; mechanical and chemical tests of materials; and various tests of propeller strength and flexibility. digital.library.unt.edu/ark:/67531/metadc55750/
- The Aerodynamic Laboratory of the Belgian Service Technique de L'Aeronautique
- This report provides a description of the wind tunnel housing and motors. digital.library.unt.edu/ark:/67531/metadc58832/
- The aerodynamical laboratory of the Vienna Technical High School
- We will give here only a short explanation of the operation of the plant and deal principally with the question of what it has accomplished. digital.library.unt.edu/ark:/67531/metadc53660/
- Aerodynamics and ballistics
- Ballistics is a science hundreds of years old and this report is an attempt to show how these older principles can be used in the newer science of aerodynamics. digital.library.unt.edu/ark:/67531/metadc55683/
- Aeronautic instruction in Germany
- This report contains a list of the courses relating to aeronautics announced in Germany, both in the technical high schools and in the universities. digital.library.unt.edu/ark:/67531/metadc53650/
- Aeronautic insurance
- The problem of insuring the emerging commercial aeronautic industry is detailed. The author also motes that a complete solution cannot be obtained until the necessary statistics are compiled. digital.library.unt.edu/ark:/67531/metadc54177/
- Aeronautical museums
- Different methods of presenting aeronautical artifacts are examined. digital.library.unt.edu/ark:/67531/metadc55809/
- Air cooling : an experimental method of evaluating the cooling effect of air streams on air-cooled cylinders
- In this report is described an experimental method which the writer has evolved for dealing with air-cooled engines, and some of the data obtained by its means. Methods of temperature measurement and cooling are provided. digital.library.unt.edu/ark:/67531/metadc65234/
- Air-flow experiments
- 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. digital.library.unt.edu/ark:/67531/metadc58543/
- Air Forces Exerted on Streamlined Bodies with Round or Square Cross- Sections, When Placed Obliquely to the Airstream
- 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. digital.library.unt.edu/ark:/67531/metadc58643/
- Air forces on airfoils moving faster than sound
- 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. digital.library.unt.edu/ark:/67531/metadc59216/
- Air reactions to objects moving at rates above the velocity of sound with application to the air propeller
- There has been a tradition general among aeronautical engineers that a critical point exists for tip speeds at or near the velocity of sound, indicating a physical limit in the use of propellers at higher tip speeds; the idea being that something would occur analogous to what is known in marine propellers as cavitation. In the examination of the physics pertaining to both propellers and projectiles moving at or above 1100 feet per second, the conclusion was reached by the author that there is no reason for the existence of such a critical point and that, if it had been noted by observers it was not inherent in the phenomena revealed, but rather due to a particular shape or proportion of the projectile and that, with properly proportioned sections, it would not exist. digital.library.unt.edu/ark:/67531/metadc56168/
- Air traffic
- This report presents a recounting of the steps taken by France to establish national and international regulation over air traffic. digital.library.unt.edu/ark:/67531/metadc55206/
- Air transport economics
- The report presents a determination of air transport costs with and without subsidies. digital.library.unt.edu/ark:/67531/metadc55798/
- Airplane parachutes
- 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. digital.library.unt.edu/ark:/67531/metadc59234/
- Airplane performance, past and present
- The progress of airplane performance, measured by speed, is recounted in this article. digital.library.unt.edu/ark:/67531/metadc56185/
- Airplane speeds of the future
- While the reliability of predictions is poor the author still attempts to gauge the future speeds of airplanes. digital.library.unt.edu/ark:/67531/metadc56191/
- Airplane stability calculations and their verification by flight tests
- For some time, the designers of airplanes have begun to occupy themselves with the question of longitudinal stability. In their quest to simplify calculation and data collection, the designers have attached the greatest importance to the coefficient of initial longitudinal stability. In this study a diagram was constructed from the data of the tunnel tests, which depends neither on the position of the center of gravity nor of the angle of deflection of the elevators. This diagram is constructed by means of straight lines drawn through the metacenters of the complete airplane, in a direction parallel to the tangents to the polar of the airplane relative to a system of axes fixed with reference to the airplane. digital.library.unt.edu/ark:/67531/metadc55694/
- Airplane strength calculations and static tests in Russia : an attempt at standardization
- We are here giving a summary of the rules established by the Theoretical Section of the Central Aerodynamic Institute of Moscow for the different calculation cases of an airplane. It appears the engineers of the Aerodynamic Institute considered only thick or medium profiles. For these profiles they have attempted to increase the safety when the center of pressure moves appreciably toward the trailing edge. digital.library.unt.edu/ark:/67531/metadc65321/
- Alloys similar to duralumin made in other countries than Germany
- 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. digital.library.unt.edu/ark:/67531/metadc59195/
- Altitude of equilibrium of an airship
- This report details the procedure followed in establishing a general formula enabling the calculation of the maximum altitude attainable statically. digital.library.unt.edu/ark:/67531/metadc59068/
- The American airship ZR-3
- 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. digital.library.unt.edu/ark:/67531/metadc58756/
- The Analysis of Aircraft Structures as Space Frameworks. Method Based on the Forces in the Longitudinal Members
- The following examples do not take up the discussion of viewpoints to be heeded in determining the design of a framework for given external conditions. Rather they are methods for determining the forces in airplane fuselages and wings, though similar considerations are applied to certain simple cases of a different kind. The object of this treatise is to summarize and amplify these considerations from definite viewpoints. digital.library.unt.edu/ark:/67531/metadc65376/
- Application of the "Magnus effect" to the wind propulsion of ships
- No Description digital.library.unt.edu/ark:/67531/metadc65110/
- Applying the results of experiments on small models in the wind tunnel to the calculation of full-sized aircraft
- This report presents the attempt to develop a law which will permit the use of results obtained on small models in a tunnel for the calculation of full-sized airplanes, or if it exists, a law of similitude relating air forces on a full-sized plane to those on a reduced scale model. digital.library.unt.edu/ark:/67531/metadc54277/
- Approximate Calculation of the Static Longitudinal Stability of Airplanes
- It seems desirable to have some simple method for calculating quickly and with sufficient accuracy: 1) the correct position of the center of gravity; 2) the requisite tail-group dimensions; 3) and the course of the wing and tail-group moments. In out deductions, we will first replace the biplane (disregarding the effect of stagger, decalage and induced drag) by an equivalent monoplane, whose dimensions and position in space can be approximately determined in a simple manner. digital.library.unt.edu/ark:/67531/metadc65120/
- The art of writing scientific reports
- As the purpose of the report is to transmit as smoothly and as easily as possible, certain facts and ideas, to the average person likely to read it, it should be written in a full and simple enough manner to be comprehended by the least tutored, and still not be boring to the more learned readers. digital.library.unt.edu/ark:/67531/metadc53610/
- Atomization of liquid fuels. Part I
- 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 sprayed particles; 3) with respect to the penetration of the particles. digital.library.unt.edu/ark:/67531/metadc65135/
- Atomization of liquid fuels. Part II
- 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. digital.library.unt.edu/ark:/67531/metadc65068/
- The "Autogiro"
- For the first time in the world, a flying machine, heavier than the air and distinct from the airplane, has completed a circuit of four kilometers (nearly 2.5 miles) at a height of more than 25 meters (82 feet) above the ground. digital.library.unt.edu/ark:/67531/metadc56119/
- Aviation and insurance
- This article considers some of the causes which hinder the development of aircraft insurance. Different risks are discussed as well as the causes of aircraft accidents. Pilot error, poor airdromes, weather conditions, poorly adapted airplanes, and engine failures are all examined and some conclusions are made. digital.library.unt.edu/ark:/67531/metadc55230/
- Aviation fuels : with especial reference to "white spirit."
- Gasoline, the fuel now used, is an extremely volatile and inflammable liquid capable of forming explosive mixtures, the cause of many catastrophes in aviation. It is therefore of special interest to investigate the possibility of using fuels which, while being less volatile than gasoline, would nevertheless enable this engine to function satisfactorily. digital.library.unt.edu/ark:/67531/metadc65274/
- Aviation in the Belgian Congo
- The establishment of air service in the Belgian Congo is detailed in this report. The airplanes, landing fields, and air routes are all discussed. digital.library.unt.edu/ark:/67531/metadc55692/
- Bagnulo heavy fuel internal combustion engine and its employment in aviation
- We see with great satisfaction that Bagnulo's studies and experiments on his high-speed, heavy-fuel engines, promise to solve not only the general problem of economical power and hence of thermal efficiency, but also all other special problems, of weight and space, and, what is still more important, range of error. digital.library.unt.edu/ark:/67531/metadc54175/
- Balloon fabrics made of Goldbeater's skins
- Goldbeater's skin, which is the prepared outside membrane of the large intestine of an ox, is examined as a balloon fabric and details of how goldbeater's skin is prepared for use are provided. The construction techniques employed by Germany, France, and England are all discussed. digital.library.unt.edu/ark:/67531/metadc56183/
- Balloon flight and atmospheric electricity
- 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. digital.library.unt.edu/ark:/67531/metadc58645/
- Beacon lights for air traffic
- A beacon light manufactured by the Julius Pintsch Company is described and the arrangement of these lights on a landing field is discussed. digital.library.unt.edu/ark:/67531/metadc55698/