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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
System:
The UNT Digital Library
Combustion of Liquid Fuels in Diesel Engine
Hitherto, definite specifications have always been made for fuel oils and they have been classified as more or less good or non-utilizable. The present aim, however, is to build Diesel engines capable of using even the poorest liquid fuels and especially the waste products of the oil industry, without special chemical or physical preparation.
Date:
October 1924
Creator:
Alt, Otto
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.
System:
The UNT Digital Library
Fire prevention on airplanes. Part 1
Various methods for preventing fires in airplanes are presented with most efforts centering around prevention of backfires, new engine and carburetor designs, as well as investigations on different types of fuels.
Date:
October 1929
Creator:
Sabatier, J.
System:
The UNT Digital Library
Concrete Airship Sheds at Orly, France Part 2: Supporting Structure and Method of Moving, Mechanism for Moving the Centering, Apparatus for Handling the Materials, Remarks on Construction Details
This report deals mainly with the methods of construction employed when after the plan had been approved. The foundation, side walls, doors and roof are all discussed and the economic savings resulting from this method of construction.
Date:
October 1925
Creator:
Freyssinet
System:
The UNT Digital Library
Concrete Airship Sheds at Orly, France Part 1: General Aspect of the Problem, Basic Principles of the Final Project, Principal Structural Elements
This report details the contest to design and build concrete airship hangers. The difficulty lies in the magnitude of the absolute dimensions. An airship shed must withstand two principal types of stresses: those resulting from its own weight and those due to the wind. This report discusses both problems in detail.
Date:
October 1925
Creator:
Freyssinet
System:
The UNT Digital Library
The Vertical Accelerometer, a New Instrument for Air Navigation
This report endeavors to show the possibility of determining the rate of acceleration and the advantage of having such an accelerometer in addition to other aviation instruments. Most of the discussions concern balloons.
Date:
October 1923
Creator:
Laboccetta, Letterio
System:
The UNT Digital Library
Handley Page Metal Construction
In this report Handley Page construction techniques are shown such as: solid-drawn tubular duralumin spars are used in the stabilizer; plain channel sections are used extensively for minor components; and the manner of assembling them into a stabilizer compression strut is shown.
Date:
October 1929
Creator:
unknown
System:
The UNT Digital Library
Lift Distribution and Longitudinal Stability of an Airplane
The preliminary calculation of the airplane polar and hence of the flight performances and characteristics rests on the assumption of an elliptical lift distribution at all altitudes. For large angles of attack below C(sub a (sub max)), this method of calculation yields no satisfactory agreement with measurements made in flight. An attempt is made to eliminate the errors in the preliminary calculation by the assumption of a disturbance of the lift distribution in this angle-of-attack range, which is so important for the constructor. An explanation is also given of the great differences found in flight with and without propeller slipstream.
Date:
October 1931
Creator:
Töpfer, Carl
System:
The UNT Digital Library
Information Obtained From Airplane Flight Tests in the Year 1927-1928
The information obtained from flight tests in 1927-1928 covers chiefly the effect of the structural features of an airplane on its stability, controllability, maneuverability and spinning characteristics.
Date:
October 1929
Creator:
Hübner, W.
System:
The UNT Digital Library
Fire prevention on airplanes. Part 2
This part of the report presents a detailed examination of spark prevention, fire extinguishers, and fuel tank location and design. A continued program of investigations and research is also proposed.
Date:
October 1929
Creator:
Sabatier, J.
System:
The UNT Digital Library
Velocity Distribution in the Boundary Layer of a Submerged Plate
This report deals with the measurement of the velocity distribution of the air in the velocity of a plate placed parallel to the air flow. The measurements took place in a small wind tunnel where the diameter of the entrance cone is 30 cm and the length of the free jet between the entrance and exit cones is about 2.5 m. The measurements were made in the free jet where the static pressure was constant, which was essential for the method of measurement used.
Date:
October 1930
Creator:
Hansen, M.
System:
The UNT Digital Library
Some German Gliders of 1920-1923
Memorandum presenting a review of some of the German gliders produced from 1920-1923. The designs, flight characteristics, and descriptions of successful flights are provided.
Date:
October 1927
Creator:
Gymnich, Alfried
System:
The UNT Digital Library
Schütte-Lanz Airship Projects After the War
The stressing of an airship depends on three nonuniformly distributed forces: air forces; the distribution of acceleration forces; and how the air pressure is distributed on the hull. This report examines the stresses and comes to conclusions on the size of airships.
Date:
October 1925
Creator:
Weiss, Georg
System:
The UNT Digital Library
Nieuport-Astra Parachute Contest
Report presenting a description of a parachute design contest. The object of this contest was to obtain a parachute of light weight and small bulk, suitable for airplanes. The primary areas of focus were safety, ability to be installed on airplanes, speed, materials, and behavior of the parachutes in the air.
Date:
October 1923
Creator:
Philippe, J.
System:
The UNT Digital Library
Tin Soldering of Aluminum and Its Alloys
A method is presented for soldering aluminum to other metals. The method adopted consists of a galvanic application to the surface of the light-metal parts to be soldered, of a layer of another metal, which, without reacting electrolytically on the aluminum, adheres strongly to the surface to which it is applied, and is, on the other hand, adapted to receive the soft solder. The metal found to meet the criteria best was iron.
Date:
October 1921
Creator:
Gallo, Gino
System:
The UNT Digital Library
Diesel-Engine Investigations: Ignition-Chamber Engines
This report presents a thorough investigation of the functioning process and injection and combustion characteristics of ignition-chamber engines.
Date:
October 1930
Creator:
Neumann, Kurt
System:
The UNT Digital Library
The New "Charlestop" Remote Brake Transmission and Control
This report presents a description, diagrams and photographs of the Charlestop remote brake system. A description of the brake system and diagrams showing the individual components are provided.
Date:
October 1931
Creator:
Léglise, Pierre
System:
The UNT Digital Library
Experimental Investigation of the Physical Properties of Medium and Heavy Oils, Their Vaporization and Use in Explosion Engines Part 3
The test equipment for studying the vaporization of heavy and medium oils is described as well as some of the experimental properties explored such as vaporization speed and diffusion coefficient. The experimental arrangement is also discussed.
Date:
October 1926
Creator:
Heinlein, Fritz
System:
The UNT Digital Library
Turbulent Flow
Report presenting some information and potential areas of study of turbulent flow and turbulence.
Date:
October 1927
Creator:
Prandtl, L.
System:
The UNT Digital Library
Inherent Stability of Helicopters
The equilibrium, in still air, of a "stationary" helicopter (i.e., of one having neither vertical nor translational velocity, but a tendency to remain practically motionless within restricted limits of space) presents some difficulty in practice and justifies a theoretical investigation of its "inherent stability," i.e., independent of the pilot.
Date:
October 1923
Creator:
Crocco, G. Arturo
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