National Advisory Committee for Aeronautics (NACA) - 380 Matching Results

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Coefficients of Flow of Standard Nozzles

Description: We first undertook experiments with air, devoted principally to the investigation of the disturbances due to the differences in the nature of the flow to the nozzle. The difficulty of measuring the air, however, caused us to experiment with water. Due to the possibility of measuring the capacity of the container, this method was much more accurate than measuring with Pitot tobes.
Date: January 1930
Creator: Mueller, H. & Peters, H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Combating Airplane Fires

Description: This report provides a summary of the important steps to be taken in combating airplane fires. Some considerations and ways of preventing fires from developing are provided.
Date: January 1930
Creator: Brunat, Henri
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Contribution to the Study of Normal Burning in Gaseous Carbureted Mixtures: Part 1

Description: In the present study it is proposed to provide an equipment permitting the study of the propagation of the region of reaction in mixtures of air and carbureted gases enclosed within a cylinder. Ignition is produced at the end of compression by an electric spark. With this apparatus it is proposed to determine: 1) the influence of the richness of the explosive mixture on the rate of flame propagation; 2) the influence of the degree of volumetric compression on one of the hydrocarbons; 3) the inf… more
Date: January 1930
Creator: Duchene, M. R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Structural Details of the Giant Dornier Seaplane "Do X."

Description: Memorandum presenting a description of the Dornier seaplane Do X. Details of the general description, materials, details of the main wing and upper wing, details of the hull and of the wing stubs, tail surfaces and control lines, power plant, and launching car and floating dock are provided.
Date: January 1930
Creator: Gustosa, Corrado
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Experimental Investigations Concerning the Limits of Detonation in Gaseous Mixtures: Part 2

Description: Memorandum presenting an investigation concerning the limits of detonation in gaseous mixtures. In regards to the results, by progressive dilution of the explosive, the course of the chemical reaction becomes slower and slower until finally the transformation within the reaction zone becomes so slow that it is not there completed.
Date: February 1930
Creator: Wendlandt, Rudolf
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Relation Between the Stability Characteristics and the Controllability of German Airplanes

Description: This survey is intended to give a general approximate idea of the stability and controllability of German airplanes. Both flight characteristics, including the behavior of the airplane under the action of deflected controls and external disturbances, and flight performance, which refers to climbing, speed, take-off, and landing qualities.
Date: February 1930
Creator: Hübner, Walter
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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The Relation Between the Tensile Strength and the Hardness of Metals

Description: This report presents methods determining the hardness and tensile strength of metals by showing the effect and dependence of the hardness numbers on the strain-hardening. Relations between the hardness numbers and the ordinary stress-strain diagrams and tensile strength are given. Procedures for finding the Brinell strength are also presented.
Date: February 1930
Creator: Schwarz, O.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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The Boundary Layer as a Means of Controlling the Flow of Liquids and Gases

Description: According to one of the main propositions of the boundary layer theory the scarcely noticeable boundary layer may, under certain conditions, have a decisive influence on the form of the external flow by causing it to separate from the wing surface. These phenomena are known to be caused by a kind of stagnation of the boundary layer at the point of separation. The present report deals with similar phenomena. It is important to note that usually the cause (external interference) directly affects … more
Date: March 1930
Creator: Schrenk, Oskar
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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The Electrodynamometric Balance of the Small Wind Tunnel of the French Service of Aeronautical Research

Description: This investigation shows the attempt to improve the electrodynamomoter designed by Mr. Villey. The force to be measured acts on a flexible steel plate which is placed in front of a fixed plate. The deformation varies the original thickness of the layer of air between the two plates, thus causing a more rapid variation in the coefficient of electrostatic attraction of the two plates than in the capacity of the condenser formed by the dynamometer.
Date: March 1930
Creator: Rebuffet, P.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Measurement of Profile Drag on an Airplane in Flight by the Momentum Method: Part 2

Description: The purpose of this section is to survey the present status of scientific knowledge of the causes which produce drag, in order, if possible, to establish the relation between the individual results and the actual phenomena which demonstrate the fundamental importance of surface conditions. A discussion of the boundary layer is followed by: relations between frictional and form drag, application to profile-drag measurements, and different kinds of roughness. High-pressure wind tunnel tests are d… more
Date: March 1930
Creator: Schrenk, Martin
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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The 1929 Rhon soaring-flight contest

Description: The limitation of the 1929 contest to performance gliders necessitated the establishment of a formula which would make it possible to distinguish between performance gliders and school and training gliders. The sinking speed was therefore adopted as the basis for such a distinction, and the requirement was made that the sinking speed of a performance glider should not exceed 0.8 m/s. The rest of the report details the different entries with regard to design and performance.
Date: April 1930
Creator: Lippisch, Alexander
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Experimental Investigation of Aircraft Propellers Exposed to Oblique Air Currents

Description: "Two screw propellers, a normal airplane propeller with a pitch/diameter ratio H/D = 0.5 and a helicopter propeller H/D = 0.2 were tested in the large wind tunnel of the Gottigen Aerodynamic Institute. With both propellers the angle between the propeller axis and the direction of the wind was varied from 0 to 90 degrees. In addition to the three force and the three moment components in a wind-fast coordinate system, the corresponding components in a propeller-fast coordinate system, a total of … more
Date: April 1930
Creator: Flachsbart, O. & Kröber, G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Improving the Performance of Multi-Engined Airplanes by Means of Idling Propellers: The "Free-Wheel" Propeller

Description: In order to demonstrate the importance of free-wheeling propellers, this report considers the braking effect of a propeller on a stopped engine when the propeller is rigidly connected with the engine shaft and also when mounted on a free-wheel hub. The cases of propellers of asymmetric and symmetric section are discussed. The author describes the mechanism of the free-wheel propeller as constructed for this test. The results obtained with the device mounted on a 1,000 horsepower two-engine airp… more
Date: April 1930
Creator: Pillard, M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Ratier Metal Propeller With Pitch Variable in Flight

Description: One of the serious sources of difficulties in variable pitch propellers is the turning moment or torque due to the centrifugal force which tends to bring the mean plane of the blades into the plane of rotation. This moment, which is found elsewhere only in propellers with removable blades, is so great that the aerodynamic forces, as regards their effect on the torsion, become entirely negligible in comparison with it. This report presents the Ratier Company's solution to changing the pitch of a… more
Date: April 1930
Creator: Léglise, Pierre
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Balanced and Servo Control Surfaces

Description: "Many reports on various control systems are available, but the results cannot be generally applied since the effect of particular changes of surface-form and mounting are subject to variations depending upon airfoil section and influences of airplane layout. This report presents a simple analysis of several control systems in more general use. Elevators, ailerons, and rudders are all discussed" (p. 1).
Date: May 1930
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Development of the Junkers-Diesel Aircraft Engine

Description: The working process of the Junkers engine has resulted from a series of attempts to attain high performance and to control the necessarily rapid and complete combustion at extremely high speeds. The two main problems of Diesel engines in aircraft are addressed; namely, incomplete combustion and the greater weight of Diesel engine parts compared to gasoline engines.
Date: May 1930
Creator: Gasterstädt
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Experimental Research on the Friction of Pivots

Description: In horology the friction between solids is of the greatest importance; one limited, however, to the application of the laws of Coulomb which, do not at all correspond with reality. This report presents a review of the subject and some general conclusions. The choice of lubricant is discussed as well as the pressure between frictional surfaces. The gears in a watch are used extensively as examples.
Date: May 1930
Creator: Jaquerod, A.; Defossez, L. & Mügeli, H
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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The Magnus Effect in Theory and in Reality

Description: A discussion of the Flettner rotor is presented from a nautical and economic viewpoint, and although it was a failure, the experimental and theoretical inventions cannot be disregarded. The following critical and experimental investigation will show the relations and applicability of the theories and practical applications. The Magnus effect is described in detail and a discussion and critical review of the Magnus effect is included.
Date: May 1930
Creator: Ahlborn, F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Recent Tests of Tailless Airplanes

Description: This report details the advantages and construction of tailless airplanes. Both a glider and a powered model were built and the specifications of both airplanes are listed.
Date: May 1930
Creator: Lippisch, Alexander
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Contribution to the Theory of Propeller Vibrations

Description: This report presents a calculation of the torsional frequencies of revolving bars with allowance for the air forces. Calculation of the flexural or bonding frequencies of revolving straight or tapered bars in terms of the angular velocity of revolution. Calculation on the basis of Rayleigh's principle of variation. There is also a discussion of error estimation and the accuracy of results. The author then provides an application of the theory to screw propellers for airplanes and the discusses … more
Date: June 1930
Creator: Liebers, F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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"Gloster" Metal Construction

Description: This report details the methods of construction employed by the Gloster Company in their fabrication of metal aircraft parts. Ribs, spars, wings, and metal treatments to prevent oxidation are all discussed.
Date: June 1930
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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