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  Partner: UNT Libraries Government Documents Department
 Decade: 1910-1919
 Collection: Technical Report Archive and Image Library
Preliminary report on the problem of the atmosphere in relation to aeronautics

Preliminary report on the problem of the atmosphere in relation to aeronautics

Date: January 1, 1917
Creator: Marvin, Charles F
Description: A report to the Weather Bureau, Washington DC, from the chairman of the Subcommittee on the Atmosphere in Relation to Aeronautics describing the activities accomplished and the proposal of work to be undertaken by the subcommittee.
Contributing Partner: UNT Libraries Government Documents Department
The Kiln Drying of Wood for Airplanes

The Kiln Drying of Wood for Airplanes

Date: January 1, 1919
Creator: Tiemann, Harry D
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.
Contributing Partner: UNT Libraries Government Documents Department
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
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; Norton, F H & Hebbert, C M
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 & Crook, L H
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
Report on behavior of aeroplanes in gusts

Report on behavior of aeroplanes in gusts

Date: January 1, 1917
Creator: Hunsaker, J C & Wilson, Edward Bidwell
Description: Part 1 presents the results of a wind tunnel test of a biplane model with an 18 inch span. The lift, drift, and pitching moment were measured for a series of angles of incidence corresponding to the maximum possible changes of flight attitude. Only the discussion of symmetrical or longitudinal changes is given. From the observed rate of variation of the forces and pitching moment, it was possible to calculate the derivatives needed in the complete theory of longitudinal stability in still air. The damping of the pitching oscillation was also determined experimentally. Part 2 presents a theoretical method for determining the effects of gusts on aeroplanes in the following cases: (1) head-on gusts rising from 0 to j feet per second with various degrees of sharpness, (2) up gusts of the same type, (3) rotary gusts of the same type, (4) rear gusts and down gusts are included by merely changing the sign of j.
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; Warner, Edward P & Denkinger, George M
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
The stretching of the fabric and the deformation of the envelope in nonrigid balloons

The stretching of the fabric and the deformation of the envelope in nonrigid balloons

Date: January 1, 1918
Creator: Haas, Rudolf & Dietzius, Alexander
Description: Report presents the performance of fabrics used for the envelopes of airships.
Contributing Partner: UNT Libraries Government Documents Department
Experimental researches on the resistance of air

Experimental researches on the resistance of air

Date: January 1, 1917
Creator: Marchis, L
Description: Report presents the experimental results of the resistance of air of a body moving in relative movement to the air with which it is surrounded.
Contributing Partner: UNT Libraries Government Documents Department
Aerofoils and aerofoil structural combinations

Aerofoils and aerofoil structural combinations

Date: January 1, 1918
Creator: Gorrell, Edgar S & Martin, H S
Description: Report presents results of wind tunnel tests of cambered aerofoils and body-wing combinations used for biplanes. Aerodynamic characteristics including drag, lift-drift ratio and stability derivatives are given.
Contributing Partner: UNT Libraries Government Documents Department
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