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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.
System:
The UNT Digital Library
Influence of Struts and Stays on the Speed of an Airplane
Report presenting an experiment in the Rechlin airdrome in the fall of 1918 to determine the influence of struts and stays on the speed of an airplane. Results indicated that only a slight increase in horizontal speed was shown in a stayless airplane, but it had considerably greater climbing speed.
Date:
October 1921
Creator:
Heidelberg, V.
System:
The UNT Digital Library
Some Remarks Concerning Soaring Flight
The publication of the following details is due to the desire of the editor to have the problems of soaring flight treated on the occasion of the Rhone Soaring Flight Contest. Soaring flight is defined as motorless flight without loss of height. Some calculations are provided in order to maximize the potential effects of wind and air currents.
Date:
October 1921
Creator:
Prandtl, L.
System:
The UNT Digital Library
A Petrol-Proof Flexible Tubing at Last: An Invention of the Greatest Importance to Aviation
Report presenting a description of petrol-proof tubing and why it is so important to highly effective aircraft engines. A description of the union terminals present on the tubes is also provided.
Date:
October 1921
Creator:
unknown
System:
The UNT Digital Library
The Design of Airplane-Engine Superchargers
Report presenting an investigation of the design of airplane engine superchargers, as they are successful for high-altitude flying.
Date:
October 1937
Creator:
von der Nüll, W.
System:
The UNT Digital Library
On the Design of Airfoils in Which the Transition of the Boundary Layer Is Delayed
Memorandum examining the phenomenon of airfoil drag, which is related almost exclusively to skin friction at high speed flight conditions. The primary way to reduce drag is to delay the transition from laminar to turbulent flow in the boundary layer along the surface. A particular airflow design that may delay transition and therefore have fewer problems related to drag are provided.
Date:
October 1952
Creator:
Tani, Itiro
System:
The UNT Digital Library
Deflection of Propeller Blades While Running
"The forces acting on the blades of a propeller proceed from the mass of the propeller and the resistance of the surrounding medium. The magnitude, direction and point of application of the resultant to the propeller blade is of prime importance for the strength calculation. Since it was obviously impracticable to bring any kind of testing device near the revolving propeller, not so much on account of the element of danger as on account of the resulting considerable disturbance of the air flow, the deflection in both cases was photographically recorded and subsequently measured at leisure" (p. 1).
Date:
October 1922
Creator:
Katzmayr, R.
System:
The UNT Digital Library
The Wing With a Pointed Tip
In airplane construction generally one finds an almost exclusive use of wing tips that are practically square end but occasionally those with large rounded tips. For use as a cantilever wing, however, a wing with pointed tips may contain valuable aerodynamic advantages.
Date:
October 1922
Creator:
v. Prondzynski, Stephan
System:
The UNT Digital Library
Effect of Periodic Changes of Angle of Attack on Behavior of Airfoils
This report presents the results of a series of experiments, which gave some quantitative results on the effect of periodic changes in the direction of the relative air flow against airfoils. The first series of experiments concerned how the angle of attack of the wing model was changed by causing the latter to oscillate about an axis parallel to the span and at right angles to the air flow. The second series embraced all the experiments in which the direction of the air flow itself was periodically changed.
Date:
October 1922
Creator:
Katzmayr, R.
System:
The UNT Digital Library
Best Rectangular and I-Shaped Cross Sections for Airplane Wing Spars
Equations are presented with which to determine spar cross-sections.
Date:
October 1922
Creator:
Sonntag, R.
System:
The UNT Digital Library
Training of Aeronautical Engineers
The requirements and preliminary coursework for aeronautical engineering are discussed. Some of the specific mechanical engineering properties that must be understood are provided. The report is incomplete.
Date:
October 1922
Creator:
Warner, Edward P.
System:
The UNT Digital Library
Air Transport Economics
Report presenting an exploration of the costs of operation for commercial airlines operating in Europe at the time of the report.
Date:
October 1922
Creator:
Warner, Edward P.
System:
The UNT Digital Library
Computative examination of bending strength of girders originally curved and subjected to longitudinal compression
This report examines the stipulation contained in the 1918 BLV, that a girder subjected to longitudinal compression under the influence of half of the specified breaking load, along with Euler bending safety with an initial deflection of 1/200 of the length of the girder can, at most, be subjected to half the stipulated breaking strength.
Date:
October 1922
Creator:
Hoff, Wilhelm
System:
The UNT Digital Library
Calculation of the hull and of the car-suspension systems of airships
Differential and integral curves are presented and well as numerous calculations relating to hulls. Some of the calculations include those relating to hulls, those relating to the invariability of the shape of the hulls, and those relating to the suspension of the hull.
Date:
October 1924
Creator:
Verduzio, R.
System:
The UNT Digital Library
Mooring Airships
The purpose of this paper is to summarize the present status of the problem of mooring airships. Mooring with one, two and even three cables are all discussed.
Date:
October 1924
Creator:
Crocco, G. A.
System:
The UNT Digital Library
Duralumin, Its Properties and Uses
A historical sketch of duralumin is presented, especially in regards to its manufacture by various countries. The properties of duralumin are discussed and strength characteristics listed. Increasing the hardness of duralumin by tempering is discussed as well as the uses of the metal.
Date:
October 1924
Creator:
Beck, R.
System:
The UNT Digital Library
Results of Experiments With Slotted Wings
This report recounts some of the successful experiments conducted in England and Germany on slotted wings and ailerons. Wind tunnel test results are given and examples of aircraft constructed with these new wing components are described.
Date:
October 1924
Creator:
Lachmann, G.
System:
The UNT Digital Library
From Linear Mechanics to Nonlinear Mechanics
Consideration is given to the techniques used in telecommunication where a nonlinear system (the modulator) results in a linear transposition of a signal. It is then shown that a similar method permits linearization of electromechanical devices or nonlinear mechanical devices. A sweep function plays the same role as the carrier wave in radio-electricity. The linearizations of certain nonlinear functionals are presented.
Date:
October 1955
Creator:
Loeb, Julien
System:
The UNT Digital Library
General Solutions of Optimum Problems in Nonstationary Flight
"A general method concerning optimum problems in nonstationary flight is developed and discussed. Best flight techniques are determined for the following conditions: climb with minimum time, climb with minimum fuel consumption, steepest climb, descending and gliding flight with maximum time or with maximum distance. Optimum distributions of speed with altitude are derived assuming constant airplane weight and neglecting curvatures and squares of path inclination in the projection of the equation of motion on the normal to the flight path" (p. 1).
Date:
October 1955
Creator:
Miele, Angelo
System:
The UNT Digital Library
Statistical analysis of the time and fatigue strength of aircraft wing structures
The results from stress measurements in flight operation afford data for analyzing the frequency of appearance of certain parts of the static breaking strength during a specified number of operating hours. Appropriate frequency evaluations furnish data for the prediction of the required strength under repeated stress in the wing structures of aircraft of the different stress categories for the specified number of operating hours demanded during the life of a component.
Date:
October 1941
Creator:
Kaul, Hans W.
System:
The UNT Digital Library
Contribution to the Aerodynamics of Rotating-Wing Aircraft: Part 2
"The interrelations established in an earlier report (NACA-TM-921) are used to study the best assumptions for hovering and horizontal flight. The effect of the twisted and tapered blade on the rotor efficiency is analyzed and the gliding coefficient at different stages (from autogyro to helicopter) of horizontal flight compared. To the extent that model or full-scale test data are available, they are included in the comparison" (p. 1).
Date:
October 1941
Creator:
Sissingh, G.
System:
The UNT Digital Library
Buckling Tests on Eccentrically Loaded Beam Columns
"Formulas are obtained for computing the buckling load of rods eccentrically loaded at each end, the computation being extended in particular to the inelastic range. The test results are graphically presented on three sets of curves. Two of these, at least for the elastic range, are independent of the material tested. The third set, which is independent of the material, possesses greater clearness and is therefore used for comparing the test results with the theoretical" (p. 1).
Date:
October 1941
Creator:
Cassens, J.
System:
The UNT Digital Library
Static Longitudinal Stability and Longitudinal Control of Autogiro Rotors
The present report discusses three different systems of elevator control and their effects on the stability and maneuverability of autogiros: (a) ailerons and elevators (standard); (b) blade control (la Cierval); (c) gravity control (new).
Date:
October 1938
Creator:
Schrenk, M.
System:
The UNT Digital Library
The Twisting of Thin-Walled, Stiffened Circular Cylinders
On the basis of the present investigation of the twisting of thin-walled, stiffened cylinders the following conclusions can be reached: 1) there is as yet no generally applicable formula for the buckling moment of the skin; 2) the mathematical treatment of the condition of the shell after buckling of the skin is based on the tension-field theory, wherein the strain condition is considered homogenous.
Date:
October 1938
Creator:
Schapitz, E.
System:
The UNT Digital Library