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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.
Item Type: Refine your search to only Report
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The pressure distribution over the horizontal tail surfaces of an airplane 2

Description: From Summary: "This investigation was undertaken to determine whether the results obtained upon model tail surfaces can be used to accurately predict loads upon the full-sized tail; and also to find the distribution of load when large elevator angles are used, as the loads from such angles can not be obtained readily in free flight. The method consisted in using a metal horizontal tail surface inside of which small air passages, connecting with a series of holes in the surface, led the pressure… more
Date: 1921
Creator: Norton, F. H. & Bacon, D. L.
Item Type: Refine your search to only Report
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Preliminary experiments to determine scale and slip-stream effects on a 1/24th size model of a JN4H biplane

Description: This work was undertaken to obtain results on a small model of a complete airplane which might be used for comparison with corresponding tests made in full flight. Somewhat similar tests have been previously made at various other laboratories; but as certain discrepancies exist between corresponding tests in different tunnels, it has been deemed advisable to obtain a direct comparison for this particular installation. The present work covers tests on a one-twenty-fourth scale model at speeds va… more
Date: 1921
Creator: Bacon, D. L.
Item Type: Refine your search to only Report
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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.
Item Type: Refine your search to only Report
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Statical Longitudinal Stability of Airplanes

Description: This report, which is a continuation of the "Preliminary report on free flight testing" (report no. NACA-TR-70), presents a detailed theoretical analysis of statical stability with free and locked controls and also the results of many free flight test on several types of airplanes. In developing the theory of stability with locked controls an expression for pitching moment is derived in simple terms by considering the total moment as the sum of the moments due to wings and tail surface. This ex… more
Date: 1921
Creator: Warner, Edward P.
Item Type: Refine your search to only Report
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General Theory of the Steady Motion of an Airplane

Description: The writer points out briefly the history of the method proposed for the study of steady motion of an airplane, which is different from other methods now used. M. Paul Painleve has shown how convenient the drag-lift curve was for the study of airplane steady motion. The author later added to the drift-lift curve the curve called the "speed curve" which permits a direct checking of the speed of the airplane under all flying conditions. But the speed curve was plotted in the same quadrant as the … more
Date: 1921
Creator: de Bothezat, George
Item Type: Refine your search to only Report
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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.
Item Type: Refine your search to only Report
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.
Item Type: Refine your search to only Report
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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.
Item Type: Refine your search to only Report
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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.
Item Type: Refine your search to only Report
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Performance of a Liberty 12 airplane engine

Description: In cooperation with the Engineering Division of the Air Service of the United States Army, a Liberty-12 engine has been tested at the Bureau of Standards. The program of tests was planned to yield that information considered most important in determining the value of the engine for aviation. Full power runs were made at the ground, at 25,000 feet, and at several intermediate altitudes. To determine the mechanical efficiency of the engine, friction horsepower was measured at the ground and at 15… more
Date: 1921
Creator: Sparrow, S. W. & White, H. S.
Item Type: Refine your search to only Report
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Torsion of wing trusses at diving speeds

Description: The purpose of this report is to indicate what effect the distortion of a typical loaded wing truss will have upon the load distribution. The case of high angle of incidence may be dismissed immediately from consideration as the loads on the front and rear trusses are balanced, and consequently there will be little angular distortion. A given angular distortion will have the maximum effect upon load distribution in the region of the angle of no-lift, because the slope of the lift curve is highe… more
Date: 1921
Creator: Miller, Roy G.
Item Type: Refine your search to only Report
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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.
Item Type: Refine your search to only Report
open access

A high-speed engine pressure indicator of the balanced diaphragm type

Description: This report describes a pressure-measuring device especially adapted for use in mapping indicator diagrams of high-speed internal combustion engines. The cards are obtained by a point-to-point method giving the average of a large number of engine cycles. The principle involved is the balancing of the engine cylinder pressure against a measured pressure on the opposite side of the metal a diaphragm of negligible stiffness.
Date: 1921
Creator: Dickinson, H. C. & Newell, F. B.
Item Type: Refine your search to only Report
open access

Some Factors of Airplane Engine Performance

Description: This report is based upon an analysis of a large number of airplane-engine tests. It contains the results of a search for fundamental relations between many variables of engine operation. The data used came from over 100 groups of tests made upon several engines, primarily for military information. The types of engines were the Liberty 12 and three models of the Hispano-Suiza. The tests were made in the altitude chamber, where conditions simulated altitudes up to about 30,000 feet, with engine … more
Date: 1921
Creator: Gage, Victor R.
Item Type: Refine your search to only Report
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Wind Tunnel Studies in Aerodynamic Phenomena at High Speed

Description: A great amount of research and experimental work has been done and fair success obtained in an effort to place airplane and propeller design upon an empirical basis. However, one can not fail to be impressed by the apparent lack of data available toward establishing flow phenomena upon a rational basis, such that they may be interpreted in terms of the laws of physics. With this end in view it was the object of the authors to design a wind tunnel differing from the usual type especially in rega… more
Date: 1921
Creator: Caldwell, F. W. & Fales, E. N.
Item Type: Refine your search to only Report
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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
Item Type: Refine your search to only Report
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Moisture Resistant Finishes for Airplane Woods

Description: This report describes briefly a series of experiments made at the Forest Products Laboratory, Madison, Wisconsin, to determine the comparative moisture resistance of linseed oil, impregnation treatments, condensation varnishes, oil varnishes, enamels, cellulose varnishes, rubber, electroplated and sprayed metal coatings, and metal-leaf coatings when applied to wood. All coatings except rubber and electroplated metal coatings, which were not developed sufficiently to make them practical, admitte… more
Date: 1921
Creator: Dunlap, M. E.
Item Type: Refine your search to only Report
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Properties of Special Types of Radiators

Description: This report discusses the general performance characteristics of three special classes of radiators: those with flat plate water tubes, fin and tube types, and types that whistle in an air stream. Curves and tables show the performance of representative radiators of each class and compare the flat plate and whistling types. Empirical equations are given for estimating the performance of flat plate radiators of various dimensions. This report also contains a brief discussion, with curves, showin… more
Date: 1921
Creator: Parsons, S. R.
Item Type: Refine your search to only Report
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Effects of Nature of Cooling Surface on Radiator Performance

Description: This report discusses the effects of roughness, smoothness, and cleanness of cooling surfaces on the performance of aeronautic radiators, as shown by experimental work, with different conditions of surface, on (1) heat transfer from a single brass tube and from a radiator; (2) pressure drop in an air stream in a single brass tube and in a radiator; (3) head resistance of a radiator; and (4) flow of air through a radiator. It is shown that while smooth surfaces are better than rough, the surface… more
Date: 1921
Creator: Parsons, S. R. & Kleinschmidt, R. V.
Item Type: Refine your search to only Report
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Pressure Drop in Radiator Air Tubes

Description: This report describes a method for measuring the drop in static pressure of air flowing through a radiator and shows (1) a reason for the discrepancy noted by various observers between head resistance and drop in pressure; (2) a difference in degree of contraction of the jet in entering a circular cell and a square cell; (3) the ratio of internal frictional resistance to total head resistance for two representative types; (4) the effect of smoothness of surface on pressure gradient; and (5) the… more
Date: 1921
Creator: Parsons, S. R.
Item Type: Refine your search to only Report
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Nomenclature for Aeronautics

Description: A report presenting the nomenclature and last of symbols to be used in technical reports created by NACA. The purpose of the Committee in the preparation and publication of this report is to secure uniformity in the official documents of the government and, as far as possible, in technical and other commercial publications. This report supersedes all previous publications of the Committee on this subject.
Date: 1921
Creator: United States. National Advisory Committee for Aeronautics.
Item Type: Refine your search to only Report
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