UNT Libraries Government Documents Department - 192 Matching Results

Search Results

open access

The 300 H.P. Benz Aircraft Engine

Description: This report provides a description of the Benz 300 H.P. aircraft engine containing 12 cylinders placed at a 60° angle. It includes a detailed description of the development of the constructional points, particularly the cylinders, pistons, and connecting rods, as well as the engine fitting, lubrication, oil pumps, bearings, oil tank, fuel pump, carburetors, and cooling system. There are seven pages of illustrative figures at the end of the report.
Date: January 1921
Creator: Heller, A.
open access

N.A.C.A. Langley field wind tunnel apparatus: The tilting manometer

Description: A description is given of a tilting manometer designed to meet the requirements of a manometer for use in the wind tunnel at the Langley Memorial Aeronautical Laboratory. This gauge was designed to meet the requirements of a manometer in use in connection with a static pressure plate to indicate the wind speed in the tunnel. The requirements are noted. The sensitivity of the gauge must be made inversely proportional to the pressure to be measured. The gauge must be accurately and quickly set fo… more
Date: January 1921
Creator: Norton, F. H. & Bacon, D. L.
open access

Accelerations in flight

Description: This report deals with the accelerations obtained in flight on various airplanes at Langley Field for the purpose of obtaining the magnitude of the load factors in flight and to procure information on the behavior of an airplane in various maneuvers. The instrument used in these tests was a recording accelerometer of a new type designed by the technical staff of the National Advisory Committee for Aeronautics. The instrument consists of a flat steel spring supported rigidly at one end so that t… more
Date: 1921
Creator: Norton, F. H. & Allen, E. T.
open access

Accelerometer design

Description: In connection with the development of an accelerometer for measuring the loads on airplanes in free flight a study of the theory of such instruments has been made, and the results of this study are summarized in this report. A portion of the analysis deals particularly with the sources of error and with the limitations placed on the location of the instrument in the airplane. The discussion of the dynamics of the accelerometer includes a study of its theoretical motions and of the way in which … more
Date: 1921%
Creator: Norton, F. H. & Warner, Edward P.
open access

Aerodynamic Characteristics of Aerofoils

Description: The object of this report is to bring together the investigations of the various aerodynamic laboratories in this country and Europe upon the subject of aerofoils suitable for use as lifting or control surfaces on aircraft. The data have been so arranged as to be of most use to designing engineers and for the purposes of general reference. The absolute system of coefficients has been used, since it is thought by the National Advisory Committee for Aeronautics that this system is the one most su… more
Date: 1921~
open access

Alfalfa.

Description: A guide to growing and using alfalfa on the farm. Includes recommendations for different regions of the United States.
Date: 1921
Creator: United States. Department of Agriculture.
open access

Analysis of Wing Truss Stresses Including the Effect of Redundancies

Description: Report discusses airplane wing trusses are generally designed to contain redundant members (stagger wires and external drag wires) which, according to common practice, are not taken into account in calculations, so as to simplify the stress analysis by rendering the structure statically determinate. A more accurate method, in which the redundancies are included, involves a solution by means of Castigliano's method of least work. For the purpose of demonstrating the practical application of the … more
Date: 1921%
Creator: Warner, E. P. & Miller, R. G.
open access

Angles of Attack and Air Speeds During Maneuvers

Description: From Introduction: "The following report was prepared at the Langley Memorial Aeronautical Laboratory of the National Advisory Committee for Aeronautics, as it seemed desirable that there should be some study of the attitude assumed by an airplane, and more particularly of its motion with respect to surrounding air when maneuvering, either in ordinary turns, spirals, climbs, and dives, or in those more spectacular feats commonly known as stunts. It is important to secure this information, among… more
Date: 1921~
Creator: Warner, E. P. & Norton, F. H.
open access

Annual Report of the National Advisory Committee for Aeronautics (6th). Administrative Report Including Technical Reports Nos. 83 to 110

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, House of Representatives bill 14061, a copy of the bill introduced to the House of Representatives to regulate air navigation, and a compilation of technical reports produced.
Date: 1921
open access

Beautifying the Farmstead

Description: Revised edition. Report giving practical ways for families to beautify farmsteads. Contains sections on design, locations of buildings, walkways, driveways, lawns, trees and other plants.
Date: 1921
Creator: Mulford, Furman Lloyd, b. 1869
open access

Bibliography of Petroleum and Allied Substances in 1918

Description: From Introduction: "This bulletin is the fourth in the series of petroleum bibliographies being published by the Bureau of Mines, the preceding, Bulletins 149, 165, and 180, being complications for the years 1915, 1916, and 1917, respectively. In this bulletin the same general plan has been followed in arranging the references, but a few changes and additions have been made in classification, the more important changes being in the classes "Geology and Origin" and "Refining and Refineries." Dur… more
Date: 1921
Creator: Burroughs, E. H.
open access

The Calculated Performance of Airplanes Equipped With Supercharging Engines

Description: In part one of this report are presented the theoretical performance curves of an airplane engine equipped with a supercharging compressor. In predicting the gross power of a supercharging engine, the writer uses temperature and pressure correction factors based on experiments made at the Bureau of Standards (NACA report nos. 45 and 46).. Part two of this report presents an estimation of the performance curves of an airplane fitted with a supercharging engine.
Date: 1921
Creator: Kemble, E. C.
open access

Community Bird Refuges

Description: Report explaining how communities may establish bird refuges. Because birds eat injurious insects and provide aesthetic value to communities, it is desirable to increase their numbers in most communities. Bird refuges may be established on farms, at roadsides, in parks and fairgrounds, at schools and colleges, in cemeteries, and at reservoirs.
Date: 1921
Creator: McAtee, W. L. (Waldo Lee), 1883-1962
open access

The Corn Earworm As an Enemy of Vetch

Description: "Vetch, which has become an important forage crop throughout the Southeastern States, needs protection from the same insect that works such havoc on corn and cotton. This corn earworm, or cotton bollworm, is the most serious pest that growers of vetch have to combat. The caterpillars eat both the foliage and the seed pods, and, if the infestation is heavy, make the crop practically worthless. Vetch intended for a hay crop generally escapes serious injury, as it is cut before the caterpillars ar… more
Date: 1921
Creator: Luginbill, Philip & Beyer, A. H. (Adolph Harvey), b. 1882
open access

Cotton Diseases and Their Control

Description: "The principal cotton diseases which cause damage in the Southern States are described and illustrated in the following pages and the best-known methods of controlling them are described." -- p. 3. Diseases discussed include wilt, root knot, anthracnose, bacterial blight, shedding of bolls, rust, Texas root rot, and other minor diseases.
Date: 1921
Creator: Gilbert, William W. (William Williams), b. 1880
open access

Data on the Design of Plywood for Aircraft

Description: "This report makes available data which will aid the designer in determining the plywood that is best adapted to various aircraft parts. It gives the results of investigations made by the Forest Products Laboratory of the United States Forest Service at Madison, Wisconsin, for the Army and Navy Departments, and is one of a series of reports on the use of wood in aircraft prepared by the Forest Products Laboratory for publication by the National Advisory Committee for Aeronautics. The object of … more
Date: 1921
Creator: Elmendorf, Armin
open access

Design of Wind Tunnels and Wind Tunnel Propellers, 2

Description: Report presenting a continuation of a previous study in order to supply further data to the designers of wind tunnels. Particular emphasis was placed on the study of directional variation in the wind stream. The results indicated that placing radial vanes directly before the propeller actually increased the efficiency of the tunnel to a considerable extent.
Date: 1921
Creator: Norton, F. H. & Warner, E. P.
open access

Design of Wind Tunnels and Wind Tunnel Propellers 2

Description: This report is a continuation of National Advisory Committee for Aeronautics report no. 73. The variations in velocity and direction of the wind stream were studied by means of a recording air speed meter and a recording yawmeter. The work was carried on both in a 1-foot diameter model tunnel and in a 5-foot full-size tunnel, and wherever possible comparison was made between them. It was found that placing radial vanes directly before the propeller in the exit cone increased the efficiency of t… more
Date: 1921
Creator: Norton, F. H. & Warner, Edward P.
open access

The determination of downwash

Description: It is obvious that, in accordance with Newton's second law, the lift on an aerofoil must be equal to the vertical momentum communicated per second to the air mass affected. Consequently a lifting aerofoil in flight is trailed by a wash which has a definite inclination corresponding to the factors producing the lift. It is thought that sufficient data, theoretical and experimental, are now available for a complete determination of this wash with respect to the variation of its angle of inclinati… more
Date: January 1921
Creator: Diehl, Walter S.
open access

The determination of the effective resistance of a spindle supporting a model aerofoil

Description: An attempt was made to determine the effect of spindle interference on the lift of the airfoil by measuring moments about the axis parallel to the direction of air flow. The values obtained are of the same degree as the experimental error, and for the present this effect will be neglected. The results obtained using a U.S.A. 15 wing (plotted here) show that the correction is nearly constant from 0 degrees to 10 degrees incidence and that at greater angles its value becomes erratic. At such angl… more
Date: January 1921
Creator: Davidson, W. E. & Bacon, D. L.
open access

Diagrams of Airplane Stability

Description: In this report a study is made of the effect on longitudinal and lateral oscillations of an airplane of simultaneous variations in two resistance derivatives while the remainder of the derivatives are constant. The results are represented by diagrams in which the two variable resistance derivatives are used as coordinates, and curves are plotted along which the modulus of decay of a long oscillation has a constant value. The same type of analysis is also carried out for the stability of the par… more
Date: 1921
Creator: Bateman, H.
Back to Top of Screen