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Dependence of Propeller Efficiency on Angle of Attack of Propeller Blade
In order to determine the maximum and the most favorable pitch for a propeller, it was found desirable to investigate the dependence of propeller efficiency on the angle of attack of the propeller blade. The results of a few experiments are given to show that propeller blades conduct themselves just like airplane wings with reference to the dependence of their efficiency on their angle of attack.
Date:
December 1921
Creator:
Borck, Hermann
System:
The UNT Digital Library
Airplane performance, past and present
Report discussing the progress of airplane performance and measured by speed.
Date:
December 1922
Creator:
Warner, Edward P.
System:
The UNT Digital Library
Balloon Fabrics Made of Goldbeater's Skins
Goldbeater's skin, which is the prepared outside membrane of the large intestine of an ox, is examined as a balloon fabric and details of how goldbeater's skin is prepared for use are provided. The construction techniques employed by Germany, France, and England are all discussed.
Date:
December 1922
Creator:
Chollet, L.
System:
The UNT Digital Library
Commercial Airplanes and Seaplanes: Thick Wings or Thin Wings - All Metal or Mixed Construction
In this report we will consider, as the dominating characteristic, either the load carried, the speed, the radius of action, the fuel consumption, the activity of transport, or, lastly, the qualities of comfort and safety. The first four factors determine the theoretical efficiency, while the others determine its practical efficiency.
Date:
December 1922
Creator:
Point
System:
The UNT Digital Library
Depreciation of Aircraft
Report presenting an examination of the concept that aircraft are essentially fragile and deteriorate rapidly when in service, which the author considers to be a misunderstanding due to the intense conditions occurring during war. Some examples of commercial airplane lines that have been running for several years and some potential deterioration costs that must be considered are provided.
Date:
December 1922
Creator:
Warner, Edward P.
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
System:
The UNT Digital Library
Aeronautical Record: No. 1 (to June, 1923)
Memorandum presenting an overview of the development of aeronautical industries and commercial aircraft as well as some of the problems that are resulting from it. Details of the aeronautical budget in various countries, organization of the air service, material exports, and airline operations are provided.
Date:
December 1923
Creator:
unknown
System:
The UNT Digital Library
Factors of Safety
Factors of safety serve three purposes: provides against trouble arising from unexpectedly large loads, allows for imperfections of workmanship, represents a depreciation allowance. A consideration of these safety factors is provided in this report.
Date:
December 1923
Creator:
Warner, Edward P.
System:
The UNT Digital Library
The Aerodynamic Laboratory of the Belgian "Service Technique De L'Aeronautique"
This report provides a description of the wind tunnel housing and motors at the Belgian Service Technique de L'Aeronautique.
Date:
December 1924
Creator:
unknown
System:
The UNT Digital Library
Aviation Engines in the Endurance Contest
The contest for engines of great endurance had entries of 13 types by the following firms: Breguet, Farman, Fiat, Hispano-Suiza, Lorraine-Dietrich, Panhard-Levassor, Peugeot, Renault, and Salmson.
Date:
December 1924
Creator:
Lehr, G.
System:
The UNT Digital Library
Measuring Vibration and Torque With the Oscillograph
"The recent development of technical science demands maximum reliability of functioning, together with maximum utilization of construction materials. For this purpose we must know what stresses are produced during functioning. One cause of great stresses are mechanical vibrations and this report describes a method of using an oscilloscope to measure the stresses of rapidly changing phenomena" (p. 1).
Date:
December 1924
Creator:
Elsässer, R.
System:
The UNT Digital Library
Nomogram for Correcting Drag and Angle of Attack of an Airfoil Model in an Air Stream of Finite Diameter
In experimenting with airfoil models in a wind tunnel, the magnitude of the forces acting on the model is affected by the fact that the air stream in which the model is suspended, has a restricted cross-section. In order to utilize the results for an airplane in an unlimited quantity of air, a correction must be made. The magnitude of this correction was determined by Prandtl by the application of his wing theory.
Date:
December 1924
Creator:
unknown
System:
The UNT Digital Library
Potential Flow in Engine Valves
"The extensive applicability of the hydrodynamic theory to the problems of engine construction is clearly shown in the following attempt to determine by exact methods the nature of the flow in valves under variously restricted conditions. Observation shows that two principal kinds of flow occur in simple flat-seated valves. For small valve lifts, the flow is along the horizontal wall and is therefore deflected 90 degrees, but for greater valve lifts the flow separates and forms a free stream, whose angle of deflection naturally increases with increasing lift" (p. 1).
Date:
December 1925
Creator:
Eck, Bruno
System:
The UNT Digital Library
Strength Calculations on Airplanes
"Every strength calculation, including those on airplanes, must be preceded by a determination of the forces to be taken into account. In the following discussion, it will be assumed that the magnitudes of these forces are known and that it is only a question of how, on the basis of these known forces, to meet the prescribed conditions on the one hand and the practical requirements on the other" (p. 1).
Date:
December 1925
Creator:
Baumann, A.
System:
The UNT Digital Library
Wire Suspensions in Wind Tunnel Experiments
The elimination of the rigid supports for models and their replacement by wires constitute a great improvement by rendering negligible the interactions of support. There are disadvantages to wire, namely, the aerodynamic resistance is very large and their use is rather difficult because the whole suspension lacks rigidity and easily becomes distorted. We will here investigate the nature of these distortions, evaluate the errors they entail and describe the methods for taking account of or avoiding them.
Date:
December 1925
Creator:
Kerneis, Jean
System:
The UNT Digital Library
Determining Size of Drops in Fuel Mixture of Internal Combustion Engines
In compressorless Diesel engines and in explosion engines using fuels with high boiling points it is difficult to effect a good combustion of the fuel mixture. This report presents different methods for calculating the size and uniformity of fuel droplets and mixtures.
Date:
December 1926
Creator:
Sauter, J.
System:
The UNT Digital Library
Experimental Investigation of the Physical Properties of Medium and Heavy Oils, Their Vaporization and Use in Explosion Engines Part 4
This report presents a theoretical treatment of the vaporization process of medium and heavy oils. The results of this investigation, which were mostly obtained from the lighter components of the heavy fuels, require a 10- or 16-fold vaporization in comparison with gasoline. We must attain a still finer degree of atomization, in order to include the heavier components.
Date:
December 1926
Creator:
Heinlein, Fritz
System:
The UNT Digital Library
Experiments on Self-Ignition of Liquid Fuels
This report examines the cause and effect of the energy conversion in airless-injection engines. In order to obtain a criterion for the chosen working method, it takes into consideration the time relations between the individual processes. Observations of the engine alone do not suffice to obtain the necessary basis for a critical analysis of the processes.
Date:
December 1926
Creator:
Neumann, Kurt
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
System:
The UNT Digital Library
Duralumin - Defects and Failures
It is proposed in this paper to identify some of the defects and failures in duralumin most frequently encountered by the aircraft industry with a view to indicate their importance. The defects and failures in duralumin may be classified into the following groups: 1) defects produced during manufacture; 2) defects produced during fabrication; 3) corrosion and erosion; and 4) fatigue failures. Only the first two will be covered in this report.
Date:
December 1927
Creator:
Nelson, Wm.
System:
The UNT Digital Library
"Gloster" High Lift Biplane Wings
"The main object of these wings was to obtain a high lift without increasing the total drag, and the idea was conceived that, by using a deep high-lift section for the top wing and a medium section for the bottom wing, the mutual interference between the two would be such as to give greater efficiency of the combination as compared with two wings of equal section" (p. 1).
Date:
December 1927
Creator:
Preston, H. E.
System:
The UNT Digital Library
Increasing Lift by Releasing Compressed Air on Suction Side of Airfoil
The investigation was limited chiefly to the region of high angles of attack since it is only in this region that any considerable change in the character of the flow can be expected from such artificial aids. The slot, through which compressed air was blown, was formed by two pieces of sheet steel connected by screws at intervals of about 5 cm. It was intended to regulate the width of the slot by means of these screws. Much more compressed air was required than was originally supposed, hence all the delivery pipes were much too small. This experiment, therefore, is to be regarded as only a preliminary one.
Date:
December 1927
Creator:
Seewald, F.
System:
The UNT Digital Library
Metal Aircraft Construction at Vickers: Some Interesting New Forms Developed
This report contains descriptions of construction techniques at the Vickers plant including the building of the "wandering web," the spar flange, and the Vickers spars.
Date:
December 1927
Creator:
unknown
System:
The UNT Digital Library
Aerodynamic Characteristics of Thin Empirical Profiles and Their Application to the Tail Surfaces and Ailerons of Airplanes
From Introduction: "The increasing use of airplane wings equipped with ailerons and the importance of knowing the aerodynamic characteristics of tail units (empennages) provided with movable parts (rudders and elevators) impart some interest to the so-called "empirical profiles." For this purpose we thought best to employ the method proposed by Munk for the approximate theoretical study of thin, slightly curved profiles, assimilable, from an aerodynamic view-point, to their mean camber line."
Date:
December 1928
Creator:
Toussaint, A. & Carafoli, E.
System:
The UNT Digital Library