# National Advisory Committee for Aeronautics (NACA) - Browse

1 - 24 of 38

## 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

## 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

## Report on behavior of aeroplanes in gusts

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.
Date: January 1, 1917
Creator: Hunsaker, J C & Wilson, Edward Bidwell
Item Type: Report
Partner: UNT Libraries Government Documents Department

## Experimental researches on the resistance of air

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.
Date: January 1, 1917
Creator: Marchis, L
Item Type: Report
Partner: UNT Libraries Government Documents Department

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

Description: Report presents the performance of fabrics used for the envelopes of airships.
Date: January 1, 1918
Creator: Haas, Rudolf & Dietzius, Alexander
Item Type: Report
Partner: UNT Libraries Government Documents Department

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

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.
Date: January 1, 1917
Creator: Marvin, Charles F
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

## Investigations of Balloon and Aeroplane Fabrics

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.
Date: January 1, 1917
Creator: Gibbons, Willis A & Smith, Omar H
Item Type: Report
Partner: UNT Libraries Government Documents Department

## Relative worth of improvements of fabrics

Description: Report presents an equation that connects all the major qualities of a fabric, from which the fabric may be rigidly designed with respect to maximum ultimate economy.
Date: January 1, 1917
Item Type: Report
Partner: UNT Libraries Government Documents Department

## Report on investigations of aviation wires and cables, their fastenings and terminal connections

Description: Report presents results that show that it is possible to furnish efficient terminal connections that would allow for repairs for aviation wires and cables and eliminate the use of acid solder and blow torch.
Date: January 1, 1917
Creator: Sunderlang, C C; Horn, H J & Green, D
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

## Theory of an airplane encountering gusts II

Description: Calculations of aerodynamic effects of an airplane encountering gusts are presented.
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

## 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

## 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

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

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.
Date: January 1, 1917
Creator: Lucke, Charles Edward & Willhofft, Friederich Otto
Item Type: Report
Partner: UNT Libraries Government Documents Department

## Thermodynamic efficiency of present types of internal combustion engines for aircraft

Description: Report presents requirements of internal combustion engines suitable for aircraft. Topics include: (1) service requirements for aeronautic engines - power versus weight, reliability, and adaptability factors, (2) general characteristics of present aero engines, (3) aero engine processes and functions of parts versus power-weight ratio, reliability, and adaptability factors, and (4) general arrangement, form, proportions, and materials of aero parts - power-weight ratio, reliability, and adaptability.
Date: January 1, 1917
Creator: Lucke, Charles E.
Item Type: Report
Partner: UNT Libraries Government Documents Department

## Mufflers for aeronautic engines

Description: Report presents the design, development and experimental results of muffling devices used to reduce noise generated by the airplane power plant.
Date: January 1, 1917
Creator: Diederichs, H. & Upton, G. B.
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 altitude effect on air speed indicators

Description: The object of this report is to present the results of a theoretical and experimental study of the effect, on the performance of air speed indicators, of the different atmospheric conditions experienced at various altitudes.
Date: 1917~
Creator: Hersey, M. D.; Hunt, F. L. & Eaton, H. N.
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

## 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

## 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

## Meteorology and aeronautics

Description: A handbook in which properties and general phenomena of the atmosphere which aeronauts and aviators should understand are discussed.
Date: January 1, 1917
Creator: Blair, William R
Item Type: Report
Partner: UNT Libraries Government Documents Department