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  Partner: UNT Libraries Government Documents Department
 Decade: 1920-1929
 Collection: Technical Report Archive and Image Library
Some principles governing the establishment of meteorological stations along air routes

Some principles governing the establishment of meteorological stations along air routes

Date: March 1, 1922
Creator: Aujames, P
Description: The organization of a meteorological service for an air route involves the solution of two distinct problems: distribution and grouping of meteorological stations and communications. Experience gained in the establishment of two lines, Paris-Warsaw and Constantinople-Bucharest enables us to establish certain principles, which may be of interest to note here.
Contributing Partner: UNT Libraries Government Documents Department
Some Principles Governing the Production of Oil Wells

Some Principles Governing the Production of Oil Wells

Date: 1921
Creator: Beal, Carl H. & Lewis, J. O.
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Some problems on the lift and rolling moment of airplane wings

Some problems on the lift and rolling moment of airplane wings

Date: January 1, 1925
Creator: Scarborough, James B
Description: This report deals with the application of the airfoil and twisted wing theory to the calculation of the lift and rolling moment of airplane wings. Most of the results arrived at are strictly true only for wings of elliptic plan form. The investigation aims to give some indications of the accuracy with which the results can be applied to the wing forms in actual use.
Contributing Partner: UNT Libraries Government Documents Department
Some remarks concerning soaring flight

Some remarks concerning soaring flight

Date: October 1, 1921
Creator: Prandtl, L
Description: The publication of the following details is due to the desire of the editor to have the problems of soaring flight treated on the occasion of the Rhone Soaring Flight Contest.
Contributing Partner: UNT Libraries Government Documents Department
Some studies on the aerodynamic effect of the gap between airplane wings and fuselages

Some studies on the aerodynamic effect of the gap between airplane wings and fuselages

Date: November 1, 1929
Creator: Ober, Shatswell
Description: The general result indicated by this study is that if desirable from any viewpoint the gap between wing and fuselage may be closed without detrimental aerodynamic effects, and with a given monoplane there is less drag if the wing is directly on top of the fuselage than if it is parasol.
Contributing Partner: UNT Libraries Government Documents Department
Some tables of the factor of apparent additional mass

Some tables of the factor of apparent additional mass

Date: July 1, 1924
Creator: Munk, Max M
Description: This note, prepared for publication by the National Advisory Committee for Aeronautics, is a collection of the tables of the factor of apparent mass that have been published up to now. The theory of the motion of solids in a perfect fluid is of the greatest value for the study of most aerodynamic problems, and the additional apparent mass of an immersed solid is the most important characteristic for such theoretical numerical computations. It will therefore be helpful to have the most important values of the apparent mass - for some elementary cases - collected in a convenient form.
Contributing Partner: UNT Libraries Government Documents Department
Sources of Limestone, Gypsum, and Anhydrite for Dusting Coal Mines to Prevent Explosions

Sources of Limestone, Gypsum, and Anhydrite for Dusting Coal Mines to Prevent Explosions

Date: 1925
Creator: Bowles, Oliver
Description: None
Contributing Partner: UNT Libraries Government Documents Department
The spacing of orifices for the measure of pressure distributions

The spacing of orifices for the measure of pressure distributions

Date: January 1, 1926
Creator: Munk, Max M
Description: The following report has been prepared for publication by the NACA. Suitable locations of orifices for the measurement of pressure distributions have been discussed. Tables are given for quickly laying out these locations and for quickly and easily computing the resultant air forces from the result of the measurements.
Contributing Partner: UNT Libraries Government Documents Department
The span as a fundamental factor in airplane design

The span as a fundamental factor in airplane design

Date: September 1, 1928
Creator: Lachmann, G
Description: Previous theoretical investigations of steady curvilinear flight did not afford a suitable criterion of "maneuverability," which is very important for judging combat, sport and stunt-flying airplanes. The idea of rolling ability, i.e., of the speed of rotation of the airplane about its X axis in rectilinear flight at constant speed and for a constant, suddenly produced deflection of the ailerons, is introduced and tested under simplified assumptions for the air-force distribution over the span. This leads to the following conclusions: the effect of the moment of inertia about the X axis is negligibly small, since the speed of rotation very quickly reaches a uniform value.
Contributing Partner: UNT Libraries Government Documents Department
Spark plug defects and tests

Spark plug defects and tests

Date: January 1, 1920
Creator: Silsbee, F B; Loeb, L B; Sawyer, L G; Fonseca, E L; Dickinson, H C & Agnew, P G
Description: The successful operation of the spark plug depends to a large extent on the gas tightness of the plug. Part 1 of this report describes the method used for measuring the gas tightness of aviation spark plugs. Part 2 describes the methods used in testing the electrical conductivity of the insulation material when hot. Part 3 describes the testing of the cold dielectric strength of the insulation material, the resistance to mechanical shock, and the final engine test.
Contributing Partner: UNT Libraries Government Documents Department
The sparking voltage of spark plugs

The sparking voltage of spark plugs

Date: January 1, 1925
Creator: Silsbee, F B
Description: This report has been prepared in order to collect and correlate into convenient and useful form the available data on this subject. The importance of the subject lies in the fact that it forms the common meeting ground for studies of the performance of spark generators and spark plugs on the one hand and of the internal combustion engines on the other hand. While much of the data presented was obtained from various earlier publications, numerous places were found where necessary data were lacking, and these have been provided by experiments in gasoline engines at the Bureau of Standards.
Contributing Partner: UNT Libraries Government Documents Department
Special propeller protractor

Special propeller protractor

Date: January 1, 1928
Creator: Heim, A M
Description: A special protractor was designed and built with a view towards supplying a simple, inexpensive, practical, portable instrument for making measurements to detect propeller warpage under practically all conditions, without the use of auxiliary equipment, and without having to remove the propeller from the airplane. A detailed description is given of the protractor. Techniques for measuring are described. Directions are given on how to use the protractor to set detachable blade-type propellers on an airplane.
Contributing Partner: UNT Libraries Government Documents Department
Specializing for record-breaking

Specializing for record-breaking

Date: February 1, 1924
Creator: Warner, Edward P
Description: This report seeks to determine what constitutes airplane performance and what line should be followed in seeking to break records if the designer is given a free hand.
Contributing Partner: UNT Libraries Government Documents Department
Speed limits of aircraft

Speed limits of aircraft

Date: May 1, 1923
Creator: Everling, E
Description: This paper is restricted to the question of attainable speed limits and attacks the problem from different angles. Theoretical limits due to air resistance are presented along with design factors which may affect speed such as wing loads, wing areas, wing section shifting, landing speeds, drag-lift ratios, and power coefficients.
Contributing Partner: UNT Libraries Government Documents Department
Speed measurements made by Division "A" of the airplane director

Speed measurements made by Division "A" of the airplane director

Date: July 1, 1923
Creator: Heidelberg, V & Hoelzel, A
Description: The various speeds of an airplane can only be measured in horizontal flight, since there are no means for measuring the angle of ascent or descent. The measurements must be corrected for the density of the air. This is obtained by simultaneous pressure and temperature measurements during flight. Calculation from the mean yearly values in accordance with Everling's suggestion can only be considered an approximation, since the distribution of pressure and temperature in the individual strata at different altitudes undergoes such large variations that the yearly mean gives inaccurate values. Thermographs of the present form are useless for temperature measurements of an airplane. In altitude data, the following are to be distinguished: the height above the earth, the barometric altitude, and the altitude corresponding to the yearly mean air density. Variometers are not suited for the mechanical control of high altitude flight.
Contributing Partner: UNT Libraries Government Documents Department
Sphere drag tests in the variable density wind tunnel

Sphere drag tests in the variable density wind tunnel

Date: August 1, 1929
Creator: Jacobs, Eastman N
Description: The air forces on a twenty-centimeter sphere were measured after it had been rebuilt as an open throat type. The results from tests made at widely different densities and airspeeds and also on a smaller sphere are given.
Contributing Partner: UNT Libraries Government Documents Department
Spindled and hollow spars

Spindled and hollow spars

Date: October 1, 1926
Creator: Blyth, J. D.
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.
Contributing Partner: UNT Libraries Government Documents Department
Spiral tendency in blind flying

Spiral tendency in blind flying

Date: August 1, 1929
Creator: Carroll, Thomas & Mcavoy, William H
Description: The flight path followed by an airplane which was being flown by a blindfolded pilot was observed and recorded. When the pilot attempted to make a straight-away flight there was a tendency to deviate from the straight path and to take up a spiral one.
Contributing Partner: UNT Libraries Government Documents Department
Spontaneous combustion of hydrogen

Spontaneous combustion of hydrogen

Date: December 1, 1923
Creator: Pothmann, PH & Nusselt, Wilhelm
Description: It is shown by the author's experiments that hydrogen which escapes to the atmosphere through openings in the system may burn spontaneously if it contains dust. Purely thermal reasoning can not account for the combustion. It seems to be rather an electrical ignition. In order to determine whether the cause of the spontaneous ignition was thermo-chemical, thermo-mechanical, or thermo-electrical, the experiments in this paper were performed.
Contributing Partner: UNT Libraries Government Documents Department
Spray penetration with a simple fuel injection nozzle

Spray penetration with a simple fuel injection nozzle

Date: January 1, 1926
Creator: Miller, Harold E & Beardsley, Edward G
Description: The purpose of the tests covered by this report was to obtain specific information on the rate of penetration of the spray from a simple injection nozzle, having a single orifice with a diameter of 0.015 inch when injecting into compressed gases. The results have shown that the effects of both chamber and fuel pressures on penetration are so marked that the study of sprays by means of high-speed photography or its equivalent is necessary if the effects are to be appreciated sufficiently to enable rational analysis. It was found for these tests that the negative acceleration of the spray tip is approximately proportional to the 1.5 power of the instantaneous velocity of the spray tip.
Contributing Partner: UNT Libraries Government Documents Department
Stability equations for airship hulls

Stability equations for airship hulls

Date: January 1, 1926
Creator: Zahm, A. F.
Description: In the text are derived simple formulae for determining, directly from the data of wind tunnel tests of a model of an airship hull, what shall be the approximate character of oscillation, in pitch or yaw, of the full-scale airship when slightly disturbed from steady forward motion. (author).
Contributing Partner: UNT Libraries Government Documents Department
Stability of airplanes

Stability of airplanes

Date: May 1, 1922
Creator: Warner, Edward P
Description: The author attempts to correct the misconception that piloting an airplane requires extraordinary skill and balance. He also tries to show that airplanes are extremely stable in flight. Some of the major points covered in this article include: automatic pilots, airplanes designed to be stable, and the reliance on mathematics to help in designing stable aircraft.
Contributing Partner: UNT Libraries Government Documents Department
Stability of the parachute and helicopter

Stability of the parachute and helicopter

Date: January 1, 1920
Creator: Batemen, H
Description: This report deals with an extension of the theory of stability in oscillation to the case of aircraft following a vertical trajectory, and particularly to the oscillations of parachutes.
Contributing Partner: UNT Libraries Government Documents Department
Stall-proof airplanes

Stall-proof airplanes

Date: January 1, 1927
Creator: Lachmann, G
Description: My lecture has to do with the following questions. Is the danger of stalling necessarily inherent in the airplane in its present form and structure, or can it be diminished or eliminated by suitable means? Do we possess such means or devices and how must they operate? In this connection I will devote special attention to the exhibition of stall-proof airplanes by Fokker under the auspices of the English Air Ministry, which took place in Croyden last April.
Contributing Partner: UNT Libraries Government Documents Department