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Recent Suggestions in Diesel-Engine Construction
Different methods for increasing the efficiency of diesel engines are presented and some new designs are given.
Date:
August 1927
Creator:
Bielefeld, F. Ernst
Object Type:
Report
System:
The UNT Digital Library
Approximate Calculation of the Static Longitudinal Stability of Airplanes
It seems desirable to have some simple method for calculating quickly and with sufficient accuracy: 1) the correct position of the center of gravity; 2) the requisite tail-group dimensions; 3) and the course of the wing and tail-group moments. In out deductions, we will first replace the biplane (disregarding the effect of stagger, decalage and induced drag) by an equivalent monoplane, whose dimensions and position in space can be approximately determined in a simple manner.
Date:
November 1926
Creator:
Bienen, Theodor
Object Type:
Report
System:
The UNT Digital Library
Calculating Thrust Distribution and Efficiency of Air Propellers
I am now proposing a method for the preliminary approximate calculation of the thrust distribution and efficiency of air propellers under any operating conditions. Our task becomes the following, namely, to determine the speed relations and the forces developed on a section with a given direction and velocity of the air current, a problem which can be solved with the aid of the momentum theory.
Date:
December 1927
Creator:
Bienen, Theodor
Object Type:
Report
System:
The UNT Digital Library
Calculation of the Pressure Distribution on Bodies of Revolution in the Subsonic Flow of a Gas Part 1 - Axially Symmetrical Flow
"The present report concerns a method of computing the velocity and pressure distributions on bodies of revolution in axially symmetrical flow in the subsonic range. The differential equation for the velocity potential Phi of a compressible fluid motion is linearized tn the conventional manner, and then put in the form Delta(Phi) = 0 by affine transformation. The quantity Phi represents the velocity potential of a fictitious incompressible flow, for which a constant superposition of sources by sections is secured by a method patterned after von Karman which must comply with the boundary condition delta(phi)/delta(n) = 0 at the originally specified contour" (p. 1).
Date:
July 1947
Creator:
Bilharz, Herbert & Hölder, Ernst
Object Type:
Report
System:
The UNT Digital Library
The Plane Problem of the Flapping Wing
"In connection with an earlier report on the lifting vortex sheet which forms the basis of the following investigations this will show how the methods developed there are also suitable for dealing with the air forces for a wing with a circulation variable with time. The theory of a propulsive wing flapping up and down periodically in the manner of a bird's wing is developed. This study shows how the lift and its moment result as a function of the flapping motion, what thrust is attainable, and how high is the degree of efficiency of this flapping propulsion unit if the air friction is disregarded" (p. 1).
Date:
January 1954
Creator:
Birnbaum, Walter
Object Type:
Report
System:
The UNT Digital Library
How to Lay Out and Build an Airplane Landing Field: Notes on Shape and Size of Plot, Runway Details, Type and Arrangement of Buildings, Drainage of Field, Best Kind of Grass and Proper Marking to Aid Pilots
Report presenting a description of considerations that go into the layout and building of an aircraft landing field or airstrip. Some of the elements considered include the shape and size of the plot, general arrangement, buildings present near the airstrip, runways, grass, roadways and railroad tracks, field markings, and some miscellaneous factors are provided.
Date:
November 1922
Creator:
Black, Archibald
Object Type:
Report
System:
The UNT Digital Library
Influence of Design on Cost of Operating Airplanes
The author discusses cost of operating commercial airplanes and endeavors to clear up prevalent misunderstandings. Curves of operating cost for varying duration, speed, reserve horsepower, etc. are developed.
Date:
December 1922
Creator:
Black, Archibald
Object Type:
Report
System:
The UNT Digital Library
The Boundary Layers in Fluids with Little Friction
"The vortices forming in flowing water behind solid bodies are not represented correctly by the solution of the potential theory nor by Helmholtz's jets. Potential theory is unable to satisfy the condition that the water adheres at the wetted bodies, and its solutions of the fundamental hydrodynamic equations are at variance with the observation that the flow separates from the body at a certain point and sends forth a highly turbulent boundary layer into the free flow. Helmholtz's theory attempts to imitate the latter effect in such a way that it joins two potential flows, jet and still water, nonanalytical along a stream curve" (p. 1).
Date:
February 1950
Creator:
Blasius, H.
Object Type:
Report
System:
The UNT Digital Library
The Formation of Ice on Aircraft
"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.
Object Type:
Report
System:
The UNT Digital Library
Effect of Speed on Economy of Airship Traffic
The economic costs and benefits of speed on airship traffic are calculated and different factors are considered.
Date:
February 1925
Creator:
Bleistein, W.
Object Type:
Report
System:
The UNT Digital Library
Flight Tests for the Determination of Static Longitudinal Stability
The accuracy of the instruments used for flight test measurements has been inadequate so a new series of tests were commissioned with the development of an accurate elevator setting recorder.
Date:
September 1930
Creator:
Blenk, Hermann
Object Type:
Report
System:
The UNT Digital Library
Göttingen Six-Component Scale Measurements on a Junkers A 35 Airplane Model
The suggestion for the measurements collected in this report was prompted by the results of spinning experiments. For the theoretical spinning investigations there was a lack of data on lateral force, yawing, and rolling moment of airplanes.
Date:
October 1930
Creator:
Blenk, Hermann
Object Type:
Report
System:
The UNT Digital Library
The Monoplane as a Lifting Vortex Surface
"In Prandtl's airfoil theory the monoplane was replaced by a single lifting vortex line and yielded fairly practical results. However, the theory remained restricted to the straight wing. Yawed wings and those curved in flight direction could not be computed with this first approximation; for these the chordwise lift distribution must be taken into consideration. For the two-dimensional problem the transition from the lifting line to the lifting surface has been explained by Birnbaum. In the present report the transition to the three-dimensional problem is undertaken" (p. 1).
Date:
February 1947
Creator:
Blenk, Hermann
Object Type:
Report
System:
The UNT Digital Library
The German Investigation of the Accident at Meopham (England)
This report is a recounting of the German investigation of the crash of a commercial Junkers F 13 ge in England. The English report is examined and compared with the German interpretation of the accident.
Date:
April 1932
Creator:
Blenk, Hermann; Hertel, Heinrich & Thalau, Karl
Object Type:
Report
System:
The UNT Digital Library
Safety Factors in Aviation
A formula for calculating the safety of airplanes is given and the stresses on airplane components are calculated. Some questions regarding the information obtained from the formula and its application to safe airplane design for pilots are provided.
Date:
April 1923
Creator:
Bleriot, Louis
Object Type:
Report
System:
The UNT Digital Library
Acoustics of a Nonhomogeneous Moving Medium
Report discussing theoretical basis of the acoustics of a moving nonhomogeneous medium. Experiments that illustrate or confirm some of the theoretical explanation or derivation of these acoustics are also included.
Date:
February 1956
Creator:
Blokhintsev, D. I.
Object Type:
Report
System:
The UNT Digital Library
The Glider of the College Aviation Group of the Technical High School, Hanover
This report presents the results of testing on a glider designed and built by the College Aviation Group. The design and construction were based on the following principles: 1) the glider will be made to descend as slowly as possible; 2) rigidity and resistance were arranged to meet the conditions of varied loads; 3) construction is as simple as possible; 4) and great ease in assembling and dismounting have been sought.
Date:
January 1922
Creator:
Blume, W.
Object Type:
Report
System:
The UNT Digital Library
[Memorandums on the Subject of Joukowski Wings]
In the first article, in connection with a lecture on the hydrodynamic basis of flight and the potential flow about a Joukowski wing, the pressure distribution on several wings is computed and plotted. The diagrams of the pressure distributions are presented accompanied with a qualitative discussion of the pressure distribution. In the second article, the the cross-sectional outline (or profile) a Joukowski wing are plotted.
Date:
October 1925
Creator:
Blumenthal, Otto & Trefftz, E.
Object Type:
Report
System:
The UNT Digital Library
Pressure Distribution on Joukowski Wings
The hydrodynamics and mathematical models as applied to the potential flow about a Joukowski wing are presented.
Date:
October 1925
Creator:
Blumenthal, Otto & Trefftz, E.
Object Type:
Report
System:
The UNT Digital Library
Contribution to the Design of Plywood Shells
"The writer sets out to prove by calculation and experiment that by extensive utilization of the skin to carry axial load (reduction of stringer spacing) the stringer sections can be made small enough to afford a substantial saving in structural weight. This saving ranges from 5 to about 40 percent" (p. 1).
Date:
October 1942
Creator:
Blumrich, S.
Object Type:
Report
System:
The UNT Digital Library
Spindled and Hollow Spars
"The most usual method of arriving at the maximum amount of spindling or hollowing out permissible in the case of any particular spar section is by trial and error, a process which is apt to become laborious in the absence of good guessing - or luck. The following tables have been got out with the object of making it possible to arrive with certainty at a suitable section at the first attempt" (p. 1).
Date:
October 1926
Creator:
Blyth, J. D.
Object Type:
Report
System:
The UNT Digital Library
The Surface Structure of Ground Metal Crystals
"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.
Object Type:
Report
System:
The UNT Digital Library
The Coupling of Engines
This report examines the idea of coupling numerous engines together to turn a single propeller, which the author feels would free aircraft design from the problems of multi-engine and propeller design.
Date:
April 1921
Creator:
Boccaccio, Paul
Object Type:
Report
System:
The UNT Digital Library
Airscrew Gyroscopic Moments
"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 the plane of the airscrew (e.g., when pulling up, the transverse axis of the aircraft). The gyroscopic moment then tends to rotate the aircraft about an axis perpendicular to those of the two angular speeds and, in the came of airscrews with three or more blades, is constant during a revolution of the airscrew" (p. 1).
Date:
September 1946
Creator:
Bock, G.
Object Type:
Report
System:
The UNT Digital Library