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The Variation of Yawing Moment Due to Rolling

Description: The aerodynamical constants of an airplane necessary for the discussion of stability are partly observed and partly calculated. Among the calculated coefficients is n(p), which is the variation of yawing moment due to rolling. (author).
Date: January 1, 1918
Creator: Wilson, Edwin Bidwell
Item Type: Report
Partner: UNT Libraries Government Documents Department

Airplane dopes and doping

Description: Cellulose acetate and cellulose nitrate are the important constituents of airplane dopes in use at the present time, but planes were treated with other materials in the experimental stages of flying. The above compounds belong to the class of colloids and are of value because they produce a shrinking action on the fabric when drying out of solution, rendering it drum tight. Other colloids possessing the same property have been proposed and tried. In the first stages of the development of dope, however, shrinkage was not considered. The fabric was treated merely to render it waterproof. The first airplanes constructed were covered with cotton fabric stretched as tightly as possible over the winds, fuselage, etc., and flying was possible only in fine weather. The necessity of an airplane which would fly under all weather conditions at once became apparent. Then followed experiments with rubberized fabrics, fabrics treated with glue rendered insoluble by formaldehyde or bichromate, fabrics treated with drying and nondrying oils, shellac, casein, etc. It was found that fabrics treated as above lost their tension in damp weather, and the oil from the motor penetrated the proofing material and weakened the fabric. For the most part the film of material lacked durability. Cellulose nitrate lacquers, however were found to be more satisfactory under varying weather conditions, added less weight to the planes, and were easily applied. On the other hand, they were highly inflammable, and oil from the motor penetrated the film of cellulose nitrate, causing the tension of the fabric to be relaxed.
Date: January 1, 1919
Creator: Smith, W H
Item Type: Report
Partner: UNT Libraries Government Documents Department

The airplane tensiometer

Description: Certain parts of an airplane are subjected not only to the stresses imposed by the aerodynamic or flying load, but also to the initial stresses, caused by the tension in the stay and drift wires. Report describes a tensiometer that measures such stresses which is simple in construction, accurate, and easily and quickly operated even by inexperienced persons. Two sizes of the instrument are available. One is suitable for wires up to one-fourth inch in diameter and the other for wires from one-fourth to three-eights inch in diameter.
Date: 1919
Creator: Larson, L J
Item Type: Report
Partner: UNT Libraries Government Documents Department

The Design of Wind Tunnels and Wind Tunnel Propellers

Description: Report discusses the theory of energy losses in wind tunnels, the application of the Drzewiecki theory of propeller design to wind tunnel propellers, and the efficiency and steadiness of flow in model tunnels of various types.
Date: January 1, 1919
Creator: Warner, Edward P.; Norton, F. H. & Hebbert, C. M.
Item Type: Report
Partner: UNT Libraries Government Documents Department

Effect of Compression Ratio, Pressure, Temperature, and Humidity on Power

Description: Among other factors which affect the horsepower of an airplane engine are the atmospheric pressure, and consequently the altitude at which the engine is working, and the compression ratio, or cylinder volume divided by clearance volume. The tests upon which this report is based were selected from a large number of runs made during the intercomparison of various gasolines to determine the variation of horsepower with altitude at three different compression ratios. The test results and conclusions are presented in this report.
Date: January 1, 1919
Creator: Dickinson, H C; James, W S; Anderson, G V & Brinkerhoff, V W
Item Type: Report
Partner: UNT Libraries Government Documents Department

General Analysis of Airplane Radiator Problems

Description: Report embodies the results of a very extensive research, both theoretical and experimental, into the problems involved in the dissipation of heat by means of the airplane radiator.
Date: January 1, 1919
Creator: Dickinson, H C; James, W S & Kleinschmidt, R V
Item Type: Report
Partner: UNT Libraries Government Documents Department

General Discussion of Test Methods for Radiators

Description: Report describes the methods and apparatus developed and used in the extensive experimental research into the problems involved in the dissipation of heat by means of the airplane radiator.
Date: January 1, 1919
Creator: Dickinson, H C; James, W S & Brown, W B
Item Type: Report
Partner: UNT Libraries Government Documents Department

The Kiln Drying of Wood for Airplanes

Description: This report is descriptive of various methods used in the kiln drying of woods for airplanes and gives the results of physical tests on different types of woods after being dried by the various kiln-drying methods.
Date: January 1, 1919
Creator: Tiemann, Harry D
Item Type: Report
Partner: UNT Libraries Government Documents Department

The Limiting Velocity in Falling from a Great Height

Description: The purpose of this report is to give a simple treatment of the problem of calculating the final or limiting velocity of an object falling in vertical motion under gravity in a resisting medium. The equations of motion are easily set up and integrated when the density of the medium is constant and the resistance varies as the square of the velocity. The results show that the fundamental characteristics of the vertical motion under gravity in a resisting medium is the approach to a terminal or limiting velocity, whether the initial downward velocity is less or greater than the limiting velocity. This method can be used to calculate the terminal velocity of a bomb trajectory.
Date: January 1, 1919
Creator: Wilson, Edwin Bidwell
Item Type: Report
Partner: UNT Libraries Government Documents Department

Metering Characteristics of Carburetors

Description: Report presents the results of an extensive experimental investigation of the performance of different types of carburetors as effecting the maintenance under all conditions of correct ratio between the weights of fuel and air. It also gives a description of the Bureau of Standards carburetor test plant, test equipment and measuring instruments used to determine the metering characteristics of carburetors.
Date: January 1, 1919
Creator: Tice, Percival S & Dickinson, H C
Item Type: Report
Partner: UNT Libraries Government Documents Department

Temperatures in Spark Plugs Having Steel and Brass Shells

Description: This investigation was conducted at the Bureau of Standards for the National Advisory Committee for Aeronautics. Brass has often been assumed superior to steel for spark plug shells because of its greater heat conductivity. The measurements described in this report prove the contrary, showing that the interior of a spark plug having a brass shell is from 50 degrees to 150 degrees c. (90 degrees to 270 degrees f.) hotter than that of a similar steel plug. Consistent results were obtained in both an aviation and a truck engine, and under conditions which eliminated all other sources of difference between the plugs. It is to be concluded that steel is to be preferred to brass for spark plug shells. This report embodies the results of measurements taken of electrodes and a comparison of brass and steel insulators of spark plugs while they were in actual operation. The data throw considerable light upon the problem of the proper control of temperatures in these parts.
Date: January 1, 1919
Creator: Cragoe, C S
Item Type: Report
Partner: UNT Libraries Government Documents Department

The aerodynamic properties of thick aerofoils suitable for internal bracing

Description: The object of this investigation was to determine the characteristics of various types of wings having sufficient depth to entirely inclose the wing bracing, and also to provide data for the further design of such sections. This type of wing is of interest because it eliminates the resistance of the interplane bracing, a portion of the airplane that sometimes absorbs one-quarter of the total power required to fly, and because these wings may be made to give a very high maximum lift. Results of the investigation of the following subjects are given: (1) effect of changing the upper and lower camber of thick aerofoils of uniform section; (2) effect of thickening the center and thinning the tips of a thin aerofoil; (3) effect of adding a convex lower surface to a tapered section; (4) effect of changing the mean thickness with constant center and tip sections; and (5) effect of varying the chord along the span.
Date: 1920
Creator: Norton, F. H.
Item Type: Report
Partner: UNT Libraries Government Documents Department

The altitude laboratory for the test of aircraft engines

Description: Report presents descriptions, schematics, and photographs of the altitude laboratory for the testing of aircraft engines constructed at the Bureau of Standards for the National Advisory Committee for Aeronautics.
Date: 1920?~
Creator: Dickinson, H C & Boutell, H G
Item Type: Report
Partner: UNT Libraries Government Documents Department

Aluminum and its light alloys

Description: Report is a summary of research work which has been done here and abroad on the constitution and mechanical properties of the various alloy systems with aluminum. The mechanical properties and compositions of commercial light alloys for casting, forging, or rolling, obtainable in this country are described.
Date: 1920?~
Creator: Merica, Paul D
Item Type: Report
Partner: UNT Libraries Government Documents Department

Annual report of the National Advisory Committee for Aeronautics (4th).administrative report including Technical Reports nos. 24 to 50

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, expenditures, problems, recommendations, and a compilation of technical reports produced.
Date: 1920
Item Type: Report
Partner: UNT Libraries Government Documents Department

Bomb trajectories

Description: The report is a mathematical treatise dealing with the trajectories of bombs of high terminal velocity, dropped from a great altitude.
Date: January 1, 1920
Creator: Wilson, Edwin Bidwell
Item Type: Report
Partner: UNT Libraries Government Documents Department

Calculation of low-pressure indicator diagrams

Description: Report develops a fundamental conception and partial application of a method for calculating the pressure-volume relationships to be expected for any given engine design. It outlines a method of computing and interpreting low-pressure indicator cards.
Date: January 1, 1920
Creator: Kemble, E C
Item Type: Report
Partner: UNT Libraries Government Documents Department

Carbureting conditions characteristics of aircraft engines

Description: Tests were conducted at the altitude laboratory erected at the Bureau of Standards for the National Advisory Committee for Aeronautics to determine the changes in engine performance with changes in atmospheric temperature and pressure at various levels above the earth's surface, with special reference to (a) the variables affecting the functioning of the carburetor and (b) the changes in performance resulting from variables in the carburetor itself. This report constitutes a concise statement of the difficulties to be encountered in this branch of carburetion.
Date: January 1, 1920
Creator: Tice, Percival S
Item Type: Report
Partner: UNT Libraries Government Documents Department

Characteristics of high-tension magnetos

Description: This report gives the results of an investigation made into the fundamental physical characteristics of high-tension ignition magnetos, and also describes the methods used for measuring the quantities involved.
Date: January 1, 1920
Creator: Silsbee, F. B.
Item Type: Report
Partner: UNT Libraries Government Documents Department

Construction of models for tests in wind tunnels

Description: Report deals with the methods of constructing aerofoils and all other parts of a model airplane, including discussion of the degree of accuracy.
Date: January 1, 1920
Creator: Norton, F. H.
Item Type: Report
Partner: UNT Libraries Government Documents Department

Development of air speed nozzles

Description: Report describes the development of a suitable speed nozzle for the first few thousand airplanes made by the United States during the recent war in Europe, and to furnish a basis for more mature instruments in the future. Requirements for the project were to provide a suitable pressure collector for aircraft speed meters and to develop a speed nozzle which would be waterproof, powerful, unaffected by slight pitch and yaw, rugged and easy to manufacture, and uniform in structure and reading, so as not to require individual calibration.
Date: January 1, 1920
Creator: Zahm, A F
Item Type: Report
Partner: UNT Libraries Government Documents Department

Effect of altitude on radiator performance

Description: As an airplane rises to high altitudes the decrease in the density and the temperature of the air have important effects on the performance of the radiator. This report gives the results of a study of the effect of reduced pressure and temperature upon the capacity of airplane radiators. A method is presented by which the performance of a radiator at an altitude may be estimated for a particular speed of the airplane at a particular altitude.
Date: January 1, 1920
Creator: James, W S & Parsons, S R
Item Type: Report
Partner: UNT Libraries Government Documents Department