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The Influence of the Jet of a Propulsion Unit on Nearby Wings

Description: "The present investigation was intended to ascertain how far a tail unit is subject to disturbance by the jet of a propulsion unit. The parameters upon which this disturbing influence depends, and the values it reaches, had to be determined" (p. 1).
Date: September 1946
Creator: Falk, H.
Partner: UNT Libraries Government Documents Department
open access

Plane and Three-Dimensional Flow at High Subsonic Speeds

Description: "For two- and three-dimensional flow in a compressible medium, a simple relation is given by which, to a first approximation, the quantitative influence of compressibility upon the velocities and pressures can be understood in a clear manner. In the application of this relation the distinct behaviors of two-dimensional and axially symmetric three-dimensional flow with increasing Mach number are brought out. For slender elliptic cylinders and ellipsoids of revolution, calculations are made of th… more
Date: October 1946
Creator: Göthert, B.
Partner: UNT Libraries Government Documents Department
open access

Investigation of Flow in a Centrifugal Pump

Description: "The investigation of the flow in a centrifugal pump indicated that the flow patterns in frictional fluid are fundamentally different from those in frictionless fluid. In particular, the dead air space adhering to the section side undoubtedly causes a reduction of the theoretically possible delivery head. The velocity distribution over a parallel circle is also subjected to a noticeable change as a result of the incomplete filling of the passages" (p. 1).
Date: July 1946
Creator: Fischer, Karl
Partner: UNT Libraries Government Documents Department
open access

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
Partner: UNT Libraries Government Documents Department
open access

Investigation of the Behavior of Thin-Walled Panels with Cutouts

Description: "The present paper deals with the computation and methods of reinforcement of stiffened panels with cutouts under bending loads such as are applied to the sides of a fuselage. A comparison is maade between the computed and test results. Results are presented of tests on panels with cutouts under tensile and compressive loads" (p. 1).
Date: September 1946
Creator: Podorozhny, A. A.
Partner: UNT Libraries Government Documents Department
open access

A Photographic Profile Recorder for Airscrews and Wing Models

Description: "This report describes an apparatus enabling measurements of bodies to be made photographically, where other methods would be difficult. It is especially useful in the case of airscrews and wing models. The utility of the machine is shown by a few examples of profile records" (p. 1).
Date: June 1946
Creator: Kuhl, R. & Raab, K.
Partner: UNT Libraries Government Documents Department
open access

Flow Investigation With the Aid of the Ultramicroscope

Description: "On the basis of photographic pictures the laminar flow at a pipe inlet was measured and compared with other measurements and computational results. The test setup is described in detail, and a series of the pictures obtained for turbulent flow is given" (p. 1).
Date: October 1946
Creator: Vogelpohl, G. & Mannesmann, D.
Partner: UNT Libraries Government Documents Department
open access

Airscrew Gyroscopic Moments

Description: "When flying in a turn or pulling out of a dive, the airscrew exerts a gyroscopic moment on the aircraft, In the case of airscrews with three or more blades, arranged symmetrically, the value of the gyroscopic moment is J(sub x) omega(sub x) omega(sub y), where J(sub x) denotes the axial moment of inertia about the axis of rotation of the airscrew, omega(sub x) the angular upeed of the airscrew about its axis, and omega (sub Y) the rotary speed of the whole aircraft about an axis parallel to th… more
Date: September 1946
Creator: Bock, G.
Partner: UNT Libraries Government Documents Department
open access

Calibration Tunnel for High Speed

Description: "For the investigation of measuring instruments at higher speeds up to a Mach number 0.7 a tunnel with closed test section was built in 1942 which was as simple and cheap as possible. The blower was a radial blower with straight sheet vanes of 800-millimeter diameter the tips of which were bent backward a little. The blower sucks the air through a honeycomb of diameter 1.2 meter with wide meshes" (p. 1).
Date: October 1946
Creator: Pretsch, J.
Partner: UNT Libraries Government Documents Department
open access

Investigations of Pressure Distribution on Fast Flying Bodies

Description: "The question to be treated is: how high is the pressure in the bow wave caused by a body flying at supersonic speed, and how far reaching are the destructive effects of that wave? The pressure distribution on an s.S. and an S. projectile of normal speed has been ascertained already by the methods of measurement used at the Ballistic Institute of the Technical Academy of the German Air Forces. Now similar investigations of the conditions on especially fast-flying bodies were carried out" (p. 1). more
Date: September 1946
Creator: Stamm, G.
Partner: UNT Libraries Government Documents Department
open access

On the Problem of Stress Corrosion

Description: "The object of the present work is first to investigate accurately the processes during stress corrosion, in particular, for light metal alloys and, as the first part of the investigation, to determine its laws; and secondly to explain its causes for various alloys and thereby find means for its partial or complete elimination and thus make possible the production of light metal alloys free from any stress corrosion. In the present paper some of the results of the investigation are given and th… more
Date: July 1946
Creator: Graf, L.
Partner: UNT Libraries Government Documents Department
open access

The Further Development of Heat-Resistant Materials for Aircraft Engines

Description: "The present report deals with the problems involved in the greater utilization and development of aircraft engine materials, and specifically; piston materials, cylinder heads, exhaust valves, and exhaust gas turbine blading. The blades of the exhaust gas turbine are likely to be the highest stressed components of modern power plants from a thermal-mechanical and chemical standpoint, even though the requirements on exhaust valves of engines with gasoline injection are in general no less string… more
Date: September 1946
Creator: Bollenrath, Franz
Partner: UNT Libraries Government Documents Department
open access

Investigation of Turbulent Mixing Processes

Description: "With water as driving medium and delivered medium in a device similar to a simple jet apparatus, the pressure and velocity fields of the mixing zone were explored with a pitot bar; the ratio of delivered to driving volume ranged between the values 0, 1, 2, and 4. An attempt was also made to analyze the mixing flow mathematically by integration of the equation of motion, with the aid of conventional formulas for the turbulent shearing stress, but this succeeded only approximately for the very s… more
Date: October 1946
Creator: Viktorin, K.
Partner: UNT Libraries Government Documents Department
open access

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.
Partner: UNT Libraries Government Documents Department
open access

Wind-Tunnel Investigation of the Horizontal Motion of a Wing Near the Ground

Description: "By the method of images the horizontal steady motion of a wing at small heights above the ground was investigated in the wind tunnel, A rectangular wing with Clark Y-H profile was tested with and without flaps. The distance from the trailing edge of the wing to the ground was varied within the limits 0.75 less than or = s/c less than or = 0.25. Measurements were made of the lift, the drag, the pitching moment, and the pressure distribution at one section" (p. 1).
Date: September 1946
Creator: Serebrisky, Y. M. & Biachuev, S. A.
Partner: UNT Libraries Government Documents Department
open access

Kinetics of Chemical Reactions in Flames

Description: In part I of the paper the theory of flame propagation is developed along the lines followed by Frank-Kamenetsky and one of the writers. The development of chain processes in flames is considered. A basis is given for the application of the method of stationary concentrations to reactions in flames; reactions with branching chains are analyzed. The case of a diffusion coefficient different from the coefficient of temperature conductivity is considered.
Date: June 1946
Creator: Zeldovich, Y. & Semenov, N. N.
Partner: UNT Libraries Government Documents Department
open access

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.
Partner: UNT Libraries Government Documents Department
open access

On Laminar and Turbulent Friction

Description: Report deals, first with the theory of the laminar friction flow, where the basic concepts of Prandtl's boundary layer theory are represented from mathematical and physical points of view, and a method is indicated by means of which even more complicated cases can be treated with simple mathematical means, at least approximately. An attempt is also made to secure a basis for the computation of the turbulent friction by means of formulas through which the empirical laws of the turbulent pipe res… more
Date: September 1946
Creator: von Karman, T.
Partner: UNT Libraries Government Documents Department
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