Serial/Series Title
Month
Day
105 Matching Results
Results open in a new window/tab.
Pitot-Static Tubes for Determining the Velocity of Air
On the occasion of the formulation of the rules for testing the efficiency of ventilators and compressors, experiments were instituted by the subcommittee on ventilators for the production of suitable tubes for velocity and pressure measurements.
Date:
February 1925
Creator:
Kumbruch, H.
System:
The UNT Digital Library
Pressure Distribution on Fuselage of Airplane Model
Memorandum describing the method of determining the pressure distribution on the fuselage, with special attention to how it is affected by the presence of the wings.
Date:
February 1925
Creator:
unknown
System:
The UNT Digital Library
Change of 180 Degrees in the Direction of a Uniform Current of Air
In the construction of aerodynamic tunnels, it is a very important matter to obtain a uniform current of air in the sections where measurements are to be made. The straight type ordinarily used for attaining a uniform current and generally recommended for use, has great defects. If we desire to avoid these defects, it is well to give the canals of the tunnel such a form that the current, after the change of direction of its asymptotes, approximates a uniform and rectilinear movement. But for this, the condition must be met that at no place does the flow exceed the maximum velocity assumed, equal to the velocity in the straight parts of the canal.
Date:
February 1926
Creator:
Witoszynski, C.
System:
The UNT Digital Library
Kirsten-Boeing Propeller
The advantages of the Kirsten-Boeing propeller consist essentially in the adjustability of the thrust in any desired direction, in the plane perpendicular to the axis of rotation of the system, and in its high efficiency. The propeller, which greatly resembles the paddle wheels used on river steamers, differs fundamentally from the latter, in that all the blades work simultaneously in the fluid medium (air or water).
Date:
February 1926
Creator:
Sachse, H.
System:
The UNT Digital Library
The Metal Construction of Airplanes - Its Advantages - Its Present State - Its Future
The use of duralumin by French airplane designers is presented, the results they have obtained, and their hopes for the future.
Date:
February 1926
Creator:
DeWoitine, M. E.
System:
The UNT Digital Library
Protection of wooden airplane parts against moisture by means of varnish
The objects of the experiments herein described were to test the protection afforded by Valspar oil varnish against the absorption of moisture by wooden airplane parts and the consequent changes in their elastic properties and to compare some of the best Dutch varnishes with Valspar.
Date:
February 1926
Creator:
Wolff, E. B. & Van Ewijk, L. J. G.
System:
The UNT Digital Library
Duralumin Welding
Gas and electric welding of duralumin are discussed. Some of the elements that go into determining a successful weld and inspecting for faults are also described.
Date:
February 1927
Creator:
Nelson, Wm.
System:
The UNT Digital Library
High-Speed Oil Engines for Vehicles Part 1: Engines With External Atomization of the Fuel, Engines With Internal Atomization of the Fuel, Hot-Bulb Engines, Diesel Engines
Different engines are tested to determine their efficiencies in burning fuel. Fuel injection and ignition chamber engines are also discussed.
Date:
February 1927
Creator:
Hausfelder, Ludwig
System:
The UNT Digital Library
On the Mutual Reaction of Wings and Body
"At the suggestion of Professor Von Karman, I have made a few theoretical investigations of the mutual reaction of the wings and body of an airplane. There was assumed as the basis of my calculations, a strongly idealized body shape, namely, a cylinder extended to infinity at both ends and having its axis parallel to the direction of motion of the airplane. The results are to be regarded as rough approximations for a long airplane body and also for an airship with fins. In my calculations, I have considered only a monoplane in which the axis of the wing is rectilinear" (p. 1).
Date:
February 1927
Creator:
Lennertz, J.
System:
The UNT Digital Library
Researches on ailerons and especially on the test loads to which they should be subjected
Aileron calculations have hitherto given greatly differing results according to different authors. It seems to be the general opinion that it is only necessary to give the ailerons such dimensions that the airplane can maneuver well, that the stresses they must undergo are relatively small, and that they are strong enough if their framework is of the order of strength as the wings to which they are attached. This article will show that the problem is really quite complex and that it should receive more attention.
Date:
February 1927
Creator:
Sabatier, J.
System:
The UNT Digital Library
Aviation Fuels (With Especial Reference To "White Spirit")
Gasoline, the fuel now used, is an extremely volatile and inflammable liquid capable of forming explosive mixtures, the cause of many catastrophes in aviation. It is therefore of special interest to investigate the possibility of using fuels which, while being less volatile than gasoline, would nevertheless enable this engine to function satisfactorily.
Date:
February 1928
Creator:
Dumanois, P.
System:
The UNT Digital Library
Parachutes for Aircraft
Report covering some characteristics of parachutes for aircraft. In order to provide the essential data on air resistance, rapidity of opening, shock stresses in opening, etc., for subsequent use, we will first give a few test results.
Date:
February 1928
Creator:
Müller, Waldemar
System:
The UNT Digital Library
Results of Aerodynamic Tests on Slotted Airfoils in the Aerotechnical Laboratory (S.T. Ae.) of Rhode St. Genese, Brussels
Report investigating the maximum lift obtainable with slotted airfoils derived from a symmetrical airfoil. These should have a smaller profile drag than other slotted airfoils.
Date:
February 1928
Creator:
Puvrez, Paul
System:
The UNT Digital Library
Welding in Airplane Construction
The present article attempts to explain the principles for the production of a perfect weld and to throw light on the unexplained problems. Moreover, it is intended to elucidate the possibilities of testing the strength and reliability of welded parts.
Date:
February 1928
Creator:
Rechtlich, A. & Schrenk, M.
System:
The UNT Digital Library
Danger of Ice Formation on Airplanes
This paper relates the different types of ice formations that can occur on airplanes and the dangers that they pose.
Date:
February 1929
Creator:
Kopp, W.
System:
The UNT Digital Library
Effect of Intake Pipe on the Volumetric Efficiency of an Internal Combustion Engine
" The writer discusses the phenomena of expansion and compression which alternately take place in the cylinders of four-stroke engines during the induction process at a high mean piston speed due to the inertia and elasticity of the mixture in the intake pipe. The present paper is intended to demonstrate theoretically the existence of a most favorable pipe length for charging" (p. 1).
Date:
February 1929
Creator:
Capetti, Antonio
System:
The UNT Digital Library
Remarks on Airplane Struts and Girders Under Compressive and Bending Stresses: Index Values
In this paper the behavior of straight, centrally loaded compression struts is discussed and values computed.
Date:
February 1929
Creator:
Wagner, Herbert
System:
The UNT Digital Library
Experimental Investigations Concerning the Limits of Detonation in Gaseous Mixtures: Part 1
Memorandum presenting an investigation to determine quantitatively the limits of detonation in gaseous mixtures for the conditions imposed and for a number of given gaseous explosive mixtures.
Date:
February 1930
Creator:
Wendlandt, Rudolf
System:
The UNT Digital Library
Experimental Investigations Concerning the Limits of Detonation in Gaseous Mixtures: Part 2
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
System:
The UNT Digital Library
Relation Between the Stability Characteristics and the Controllability of German Airplanes
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
System:
The UNT Digital Library
The Relation Between the Tensile Strength and the Hardness of Metals
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.
System:
The UNT Digital Library
The Aerodynamic Wind Vane and the Inherent Stability of Airplanes
Report discussing the design of the wind vane described rests on the following line of reasoning: An airplane, originally in equilibrium about its C.G. is assumed to be deflected from this position through an angle (delta)i, the variation (delta)i being so sudden that the path of the C.G. and the airplane speed do not change while it is taking place. The aerodynamic forces acting on the wings, tail surfaces, fuselage, etc., which, as a whole, exerted a zero moment (M(sub G) = 0) about the center of gravity at the instant of equilibrium, now exert a moment M(sub G) not equal to 0.
Date:
February 1931
Creator:
Lapresle, A.
System:
The UNT Digital Library
Flat Sheet Metal Girders With Very Thin Metal Web. Part 1: General Theories and Assumptions
The object of this report was to develop the structural method of sheet metal girders and should for that reason be considered solely from this standpoint. The ensuing methods were based on the assumption of the infinitely low stiffness in bending of the metal web. This simplifies the basis of calculations to such an extent that many questions of great practical importance can be examined which otherwise cannot be included in any analysis of the bending stiffness of the buckled plate. This report refers to such points as the safety in buckling of uprights to the effect of bending flexibility of spars, to spars not set parallel, etc.
Date:
February 1931
Creator:
Wagner, Herbert
System:
The UNT Digital Library
Flat Sheet Metal Girders With Very Thin Metal Web. Part 2: Sheet Metal Girders With Spars Resistant to Bending - Oblique Uprights - Stiffness
"Noting that the stiffness of the girder increases very rapidly as Beta increases, the result can be summed up as follows: When the cross stress preponderates in one direction and when the web plate is to be given the dimensions commensurate to its stresses, it is advisable (regardless of any ensuing structural difficulties) to set the uprights at about Beta = 120 degrees, thereby lowering the weight of the plate wall 15 percent (in contrast to Beta = 90 degrees), and raising the stiffness 55 percent. But, when the cross stresses alternate and are approximately of the same intensity in both directions, or, if the web plate thickness is determined by other structural reasons, then Beta = 90 degrees should be chosen" (p. 1).
Date:
February 1931
Creator:
Wagner, Herbert
System:
The UNT Digital Library