Technical Report Archive & Image Library (TRAIL) - 27 Matching Results

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Axial Superchargers

Description: Improvements, however, have been attained which permit a shortening of the structure without any impairment of the efficiency. The axial supercharger has a better efficiency and a simpler design than the radial supercharger. The relatively narrow range in which it operates satisfactorily should not be a very disturbing factor for practical flight problems. The length of this type of supercharger may be reduced considerably if some impairment in the efficiency is permitted.
Date: August 1944
Creator: Betz, A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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The Formation of Ice on Aircraft

Description: "The phenomenon accompanying the formation of ice on aircraft has been frequently discussed. The consequences of ice formation have been briefly analyzed in an article , but a definite physical solution of the problem has not been reached up to the present. Most of the authors agree that subcooled water droplets play a prominent part, but they fail to specify the exact manner in which this occurs" (p. 1).
Date: August 1942
Creator: Bleeker, W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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The Surface Structure of Ground Metal Crystals

Description: "The changes produced on metallic surfaces as a result of grinding and polishing are not as yet fully understood. Undoubtedly there is some more or less marked change in the crystal structure, at least, in the top layer. Hereby a diffusion of separated crystal particles may be involved, or, on plastic material, the formation of a layer in greatly deformed state, with possible recrystallization in certain conditions" (p. 1).
Date: August 1944
Creator: Boas, W. & Schmid, E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Gas Jets

Description: "A brief summary of the contents of this paper is presented here. In part I the differential equations of the problem of a gas flow in two dimensions is derived and the particular integrals by which the problem on jets is solved are given. Use is made of the same independent variables as Molenbroek used, but it is found to be more suitable to consider other functions. The stream function and velocity potential corresponding to the problem are given in the form of series" (p. 1).
Date: August 1944
Creator: Chaplygin, S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Temperature Recording in High-Speed Gases

Description: The development of suitable thermometer shapes giving the amount of temperature rise if possible without calibration and affording ready repetition is predicated upon a fundamental elucidation of this heating on a number of elementary body forms. This report provides results of tests at subsonic and supersonic velocities.
Date: August 1941
Creator: Eckert, E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Concerning the Velocity of Evaporation of Small Droplets in a Gas Atmosphere

Description: "The evaporation velocity of liquid droplets under various conditions is theoretically calculated and a number of factors are investigated which are neglected in carrying out the fundamental equation of Maxwell. It is shown that the effect of these factors at the small drop sizes and the small weight concentrations ordinarily occurring in fog can be calculated by simple corrections. The evaporation process can be regarded as quasi-stationary in most cases" (p. 1).
Date: August 1947
Creator: Fuchs, N.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Strength Investigations in Aircraft Construction Under Repeated Application of the Load

Description: "In the calculation of the dimensions of modern machines and building constructions, account is taken of the frequency of the occurrence of the anticipated loads. It is generally assumed that these loads will be repeated an infinite number, or at any rate some millions, of times during the total working life of the construction. When calculating the dimensions of the structural parts of aircraft, on the contrary, a consideration only of those frequencies in the appearance of the loads which act… more
Date: August 1946
Creator: Gassner, E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Cones in Supersonic Flow

Description: "In the case of cones in axially symmetric flow of supersonic velocity, adiabatic compression takes place between shock wave and surface of the cone. Interpolation curves betwen shock polars and the surface are therefore necessary for the complete understanding of this type of flow. They are given in the present report by graphical-numerical integration of the differential equation for all cone angles and airspeeds" (p. 1).
Date: August 1947
Creator: Hantzsche, W. & Wendt, H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Determination of the Actual Contact Surface of a Brush Contact

Description: "The number of partial contact surfaces of a brush-ring contact is measured by means of a statistical method. The particular brush is fitted with wicks - that is, insulated and cemented cylinders of brush material, terminating in the brush surface. The number of partial contact surfaces can be computed from the length of the rest periods in which such wicks remain without current" (p. 1).
Date: August 1944
Creator: Holm, Ragnar
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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The Frictional Force with Respect to the Actual Contact Surface

Description: "Hardy's statement that the frictional force is largely adhesion, and to a lesser extent, deformation energy is proved by a simple experiment. The actual contact surface of sliding contacts and hence the friction per unit of contact surface was determined in several cases. It was found for contacts in normal atmosphere to be about one-third t-one-half as high as the macroscopic tearing strength of the softest contact link, while contacts annealed in vacuum and then tested, disclosed frictional … more
Date: August 1944
Creator: Holm, Ragnar
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Moments of Cambered Round Bodies

Description: Results are presented for the moments and position of force centers of a series of cambered round bodies derived from a torpedo-like body of revolution. The effects of placing fins on the rear of the body of revolution are also included.
Date: August 1949
Creator: Kempf, Günther
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Experimental Investigation of Impact in Landing on Water

Description: "The extent of agreement of the theoretical impact computations with the actual phenomenon has not as yet been fully clarified. There is on the one hand a certain imperfection in the theory (simplifying assumptions made) and on the other an insufficiency in the experimental data available. The object of our present paper is to show how far test results agree with the available approximate computation methods, to investigate in greater detail the physical nature of impact on water, and to perfec… more
Date: August 1943
Creator: Kreps, R. L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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DVL Angular Velocity Recorder

Description: "In many studies, especially of nonstationary flight motion, it is necessary to determine the angular velocities at which the airplane rotates about its various axes. The three-component recorder is designed to serve this purpose. If the angular velocity for one flight attitude is known, other important quantities can be derived from its time rate of change, such as the angular acceleration by differentiations, or - by integration - the angles of position of the airplane - that is, the angles f… more
Date: August 1944
Creator: Liebe, Wolfgang
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Supplement to Comparison of Automatic Control Systems

Description: "This analysis deals with the indirect regulator, wherefrom the behavior of the direct regulator is deduced as a limiting case. The prime mover is looked upon as "independent of the load": a change in the adjusting power (to be applied) for the control link (as, for example, in relation to the adjusting path (eta) with pressure valves or the rudder of vessels) does not modify the actions of the prime mover. Mass forces and friction are discounted; "clearance" also is discounted in the transmiss… more
Date: August 1941
Creator: Oppelt, W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Investigations on Reductions of Friction on Wings, in Particular by Means of Boundary Layer Suction

Description: Memorandum presenting investigation on reductions of friction on wings, especially by means of boundary-layer suction. The report is broken up into several sections, including: causes of transition, laminar profiles with the transition taking place, laminar boundary-layer suction, investigation of the laminar pressure increase, investigation of the slot flow for laminar boundary-layer suction with single slots, tests about keeping a boundary layer for high Reynolds laminar with the aid of bound… more
Date: August 1947
Creator: Pfenninger, Werner
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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The Effect on the Sperry Directional Gyro in Turning

Description: "The present report is concerned with an analytical treatment of the effects of the transverse inclination of an airplane in a turn on the indication of the directional gyro. It is found that the extreme inclinations which the airplane must necessarily assume for a correct turn in the approaches executed at high speed and small radius of curvature, renders the indications of the instrument worthless during such maneuvers" (p. 1).
Date: August 1946
Creator: Rosselli Del Turco, Rossello
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Distribution of Structural Weight of Wing Along the Span

Description: "In the present report the true weight distribution law of the wing structure along the span is investigated. It is shown that the triangular distribution and that based on the proportionality to the chords do not correspond to the actual weight distribution, On the basis of extensive data on wings of the CAHI type airplane formulas are obtained from which it is possible to determine the true diagram of the structural weight distribution along the span from a knowledge of only the geometrical d… more
Date: August 1946
Creator: Savelyev, V. V.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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A Simple Approximation Method for Obtaining the Spanwise Lift Distribution

Description: The approximation method described makes possible lift-distribution computations in a few minutes. Comparison with an exact method shows satisfactory agreement. The method is of greater applicability than the exact method and includes also the important case of the wing with end plates.
Date: August 1940
Creator: Schrenk, O.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Equations for Adiabatic but Rotational Steady Gas Flows Without Friction

Description: This paper makes the following assumptions: 1) The flowing gases are assumed to have uniform energy distribution. ("Isoenergetic gas flows," that is valid with the same constants for the the energy equation entire flow.) This is correct, for example, for gas flows issuing from a region of constant pressure, density, temperature, end velocity. This property is not destroyed by compression shocks because of the universal validity of the energy law.
Date: August 1947
Creator: Schäefer, Manfred
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Thermal Theory of Combustion and Explosion

Description: This paper discusses the thermal theory of combustion and explosion, and conditions of ignition: transformation accompanied by heat liberation, transformation rate and temperature dependence.
Date: August 1942
Creator: Semenov, N. N.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Self-Ignition and Combustion of Gases

Description: This paper attempts to state laws for the self-ignition and combustion of gases in a comprehensive manner. The primary focus is recent investigations in which new combustion phenomena or new methods of studying them experimentally are brought out and investigations that throw new light on already known phenomena.
Date: August 1942
Creator: Sokolik, A. S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Lift and Drag of Wings with Small Span

Description: The lift coefficient of a wing of small span at first shows a linear increase for the increasing angle of attack, but to a lesser degree then was to be expected according to the theory of the lifting line; thereafter the lift coefficient increases more rapidly than linearity, as contrasted with the the theory of the lifting line. The induced drag coefficient for a given lift coefficient, on the other hand, is obviously much smaller than it would be according to the theory. A mall change in the … more
Date: August 1947
Creator: Weinig, F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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