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  Partner: UNT Libraries Government Documents Department
 Decade: 1910-1919
 Collection: National Advisory Committee for Aeronautics Collection
The Limiting Velocity in Falling from a Great Height

The Limiting Velocity in Falling from a Great Height

Date: January 1, 1919
Creator: Wilson, Edwin Bidwell
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.
Contributing Partner: UNT Libraries Government Documents Department
Carburetor design - a preliminary study of the state of the art

Carburetor design - a preliminary study of the state of the art

Date: January 1, 1917
Creator: Lucke, Charles Edward
Description: Report presents a preliminary study of the state of the art of the design of carburetors for gasoline engines used in aeronautic, marine and land transportation service.
Contributing Partner: UNT Libraries Government Documents Department
General specifications covering requirements of aeronautic instruments

General specifications covering requirements of aeronautic instruments

Date: January 1, 1917
Creator: unknown
Description: Report includes specifications for the use and production of instruments used in the navigation and operation of aircraft. Specifications are included for the following instruments: barometer or altimeter, compass, air speed meter, inclinometer, drift meter, tachometer, oil gauge, oil pressure gauge, gasoline gauge, gasoline flow indicator, distance indicator, barograph, angle of attack indicator, radiator temperature indicator, gasoline feed system pressure indicator, sextant, airplane director.
Contributing Partner: UNT Libraries Government Documents Department
Investigations of Balloon and Aeroplane Fabrics

Investigations of Balloon and Aeroplane Fabrics

Date: January 1, 1917
Creator: Gibbons, Willis A
Description: Report presents the experimental results of fabrics used for balloons and aeroplanes. Tensile properties, surface roughness, skin friction, flammability, permeability, and water absorption were tested for different combinations of materials.
Contributing Partner: UNT Libraries Government Documents Department
The Design of Wind Tunnels and Wind Tunnel Propellers

The Design of Wind Tunnels and Wind Tunnel Propellers

Date: January 1, 1919
Creator: Warner, Edward P
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.
Contributing Partner: UNT Libraries Government Documents Department
Airplane Stress Analysis

Airplane Stress Analysis

Date: January 1, 1918
Creator: Zahm, A F
Description: Report presents stress analysis of individual components of an airplane. Normal and abnormal loads, sudden loads, simple stresses, indirect simple stresses, resultant unit stress, repetitive and equivalent stress, maximum steady load and stress are considered.
Contributing Partner: UNT Libraries Government Documents Department
Temperatures in Spark Plugs Having Steel and Brass Shells

Temperatures in Spark Plugs Having Steel and Brass Shells

Date: January 1, 1919
Creator: Cragoe, C S
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.
Contributing Partner: UNT Libraries Government Documents Department
An investigation of the elements which contribute to statical and dynamical stability, and of the effects of variation in those elements

An investigation of the elements which contribute to statical and dynamical stability, and of the effects of variation in those elements

Date: January 1, 1918
Creator: Klemin, Alexander
Description: Part 1 gives details of models tested and methods of testing of the Eiffel 36 wing alone and the JN2 aircraft. Characteristics and performance curves for standard JN are included. Part 2 presents a statistical analysis of the following: lift and drag contributed by body and chassis tested without wings; lift and drag contributed by tail, tested without wings; the effect on lift and drift of interference between the wings of a biplane combination; lift and drag contributed by the addition of body, chassis, and tail to a biplane combination; total parasite resistance; effect of varying size of tail, keeping angle of setting constant; effect of varying length of body and size of tail at the same time, keeping constant moment of tail surface about the center of gravity; forces on the tail and the effects of downwash; effect of size and setting of tail on statical longitudinal stability effects of length of body on stability; the effects of the various elements of an airplane on longitudinal stability and the placing of the force vectors. Part 3 presents the fundamental principals of dynamical stability; computations of resistance derivatives; solution of the stability equation; dynamical stability of the Curtiss JN2; tabulation ...
Contributing Partner: UNT Libraries Government Documents Department
Experimental research on air propellers

Experimental research on air propellers

Date: January 1, 1918
Creator: Durand, William F
Description: The purposes of the experimental investigation on the performance of air propellers described in this report are as follows: (1) the development of a series of design factors and coefficients drawn from model forms distributed with some regularity over the field of air-propeller design and intended to furnish a basis of check with similar work done in other aerodynamic laboratories, and as a point of departure for the further study of special or individual types and forms; (2) the establishment of a series of experimental values derived from models and intended for later use as a basis for comparison with similar results drawn from certain selected full-sized forms and tested in free flight.
Contributing Partner: UNT Libraries Government Documents Department
Metering Characteristics of Carburetors

Metering Characteristics of Carburetors

Date: January 1, 1919
Creator: Tice, Percival S
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.
Contributing Partner: UNT Libraries Government Documents Department
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