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Aerodynamic coefficients and transformation tables

Description: The problem of the transformation of numerical values expressed in one system of units into another set or system of units frequently arises in connection with aerodynamic problems. Report contains aerodynamic coefficients and conversion tables needed to facilitate such transformation. (author).
Date: 1918~
Creator: Ames, Joseph S
Item Type: Report
Partner: UNT Libraries Government Documents Department

Aerofoils and aerofoil structural combinations

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.
Date: 1918?
Creator: Gorrell, Edgar S & Martin, H S
Item Type: Report
Partner: UNT Libraries Government Documents Department

Air flow through poppet valves

Description: Report discusses the comparative continuous flow characteristics of single and double poppet valves. The experimental data presented affords a direct comparison of valves, single and in pairs of different sizes, tested in a cylinder designed in accordance with current practice in aviation engines.
Date: 1918
Creator: Lewis, G W & Nutting, E M
Item Type: Report
Partner: UNT Libraries Government Documents Department

Airplane Stress Analysis

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.
Date: January 1, 1918
Creator: Zahm, A F & Crook, L H
Item Type: Report
Partner: UNT Libraries Government Documents Department

Experimental research on air propellers

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.
Date: January 1, 1918
Creator: Durand, William F
Item Type: Report
Partner: UNT Libraries Government Documents Department

Fabrics for aeronautic construction

Description: The Bureau of Standards undertook the investigation of airplane fabrics with the view of finding suitable substitutes for the linen fabrics, and it was decided that the fibers to be considered were cotton, ramie, silk, and hemp. Of these, the cotton fiber was the logical one to be given primary consideration. Report presents the suitability, tensibility and stretching properties of cotton fabric obtained by laboratory tests.
Date: January 1, 1918
Creator: Walen, E D
Item Type: Report
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

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 of resistance derivatives; discussion of the resistance derivatives; formation and solution of stability equations; physical conceptions of the resistance derivatives; elements contributing to damping and an investigation of low speed conditions. Part 4 includes a summary of the results of the statistical investigation and a summary of the results for dynamic stability.
Date: January 1, 1918
Creator: Klemin, Alexander; Warner, Edward P. & Denkinger, George M.
Item Type: Report
Partner: UNT Libraries Government Documents Department

Nomenclature for aeronautics

Description: Report defines the principal terms which have come into use in the development of aeronautics.
Date: January 1, 1918
Item Type: Report
Partner: UNT Libraries Government Documents Department

Periodic stresses in gyroscopic bodies, with applications to air screws

Description: Report discusses periodic stresses in gyroscopic bodies with applications to air screws caused by particle mass. Report concludes that all modern air screws obey the laws found for plane groups of particles. In particular the two-bladers exert on the shaft a rhythmic gyroscopic torque; the multibladers a steady one; both easily calculable for any given conditions of motion and mass distribution.
Date: January 1, 1918
Creator: Zahm, A F
Item Type: Report
Partner: UNT Libraries Government Documents Department

Theory of an Airplane Encountering Gusts III

Description: Report presents a new method for solving linear equations developed by Bromwich, which is suited to determine the motion for any particular gust, when the machine started from equilibrium, without the trouble of determining the constants of integration in the complementary function. (author).
Date: January 1, 1918
Creator: Wilson, Edwin Bidwell
Item Type: Report
Partner: UNT Libraries Government Documents Department

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