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Mathematical treatise on the recovery from a flat spin (open access)

Mathematical treatise on the recovery from a flat spin

In this mathematical investigation, made in collaboration with Dr. Wilhelm Schmidt, we interpret the temporary change (due to some disturbance) in the quantities which define the position of the airplane while in a flat spin. We further examine the effect of this change, of the means resorted to to produce the disturbance, and thus reveal the expedients available for recovering from a flat spin.
Date: November 1930
Creator: Fuchs, R.
System: The UNT Digital Library
Rules and Regulations for Endurance Contest of Aviation Engines: Under the Auspices of the Aero Club of France (open access)

Rules and Regulations for Endurance Contest of Aviation Engines: Under the Auspices of the Aero Club of France

Memorandum presenting the rules and regulations of the Endurance Contest of Aviation Engines, which was put on by the Aero Club of France. A description of the rules regarding the aircraft in competition, the characteristics of the tests that were conducted, and information regarding classification of the aircraft is provided.
Date: November 1923
Creator: unknown
System: The UNT Digital Library
Measurements of Vertical Air Currents in the Atmosphere (open access)

Measurements of Vertical Air Currents in the Atmosphere

To summarize, the experiments with balloons, sailplanes and light airplanes conducted thus far, reveal the vertical velocities of the air to be primarily dependent on the vertical temperature distribution. Stable stratifications result in up-and-down currents forced by the contour of the ground, which are readily recognized in flight and, if need be, may be avoided.
Date: November 1931
Creator: Lange, K. O.
System: The UNT Digital Library
Static Soaring Flight Over Flat Sea Coasts (open access)

Static Soaring Flight Over Flat Sea Coasts

Static soaring flight has hitherto been accomplished by means of two sources of energy: ascending air currents in the vicinity of obstacles and those produced by unequal heating. The latter has not yet been practically tested in soaring flight.
Date: November 1923
Creator: Georgii, W.
System: The UNT Digital Library
Effect of Altitude on Power of Aviation Engines (open access)

Effect of Altitude on Power of Aviation Engines

"These notes are intended to furnish practical and general data on the effect of altitude on engine power. The effective horsepower of an engine is a function of the mean pressure of the fluid acting on the pistons, of the R.P.M. of the engine and of the mechanical efficiency" (p. 1).
Date: November 1924
Creator: Raffaelli, Italo
System: The UNT Digital Library
Recent Progress in the Theoretical Deduction of Airplane Wings (open access)

Recent Progress in the Theoretical Deduction of Airplane Wings

The designing of an airplane requires an accurate knowledge of the aerodynamic properties of its wings, as expressed in the polar diagram. It is important to continue the theoretical researches on the aerodynamic phenomena of wings, in order to determine by calculation, their fundamental characteristics and to increase and formulate our knowledge in this field.
Date: November 1925
Creator: Panetti, M.
System: The UNT Digital Library
Note on a New and Simple Method of Dead Reckoning in Aerial Navigation (open access)

Note on a New and Simple Method of Dead Reckoning in Aerial Navigation

Memorandum presenting a method of calculating the dead reckoning in aerial navigation.
Date: November 1923
Creator: Constantin, Louis
System: The UNT Digital Library
Relations Between Ship Design and Seaplane Design (open access)

Relations Between Ship Design and Seaplane Design

This report examines various aspects of seaplane construction; namely, stability, propulsion, water-tight bulkheads, fire protection, and construction.
Date: November 1931
Creator: Schnadel, Georg
System: The UNT Digital Library
Possibility of Profitable Air Traffic Between Lisbon and Rio De Janeiro (open access)

Possibility of Profitable Air Traffic Between Lisbon and Rio De Janeiro

Different aspects of an airship line between Lisbon and Rio de Janeiro are presented. Some of the factors discussed are: the number of passengers, fuel consumption, design, itinerary, airports, flight times, and income.
Date: November 1923
Creator: Sherz, Walter
System: The UNT Digital Library
Structural Details of German Gliders (open access)

Structural Details of German Gliders

The structural details such as wings, fuselage, landing gear, and steering organs of German gliders are detailed in this report.
Date: November 1927
Creator: Gymnich, Alfried
System: The UNT Digital Library
Measurement of Visibility From the Pilot's Cockpit on Different Airplane Types (open access)

Measurement of Visibility From the Pilot's Cockpit on Different Airplane Types

A process for the measurement of the visibility of airplanes from the pilot's cockpit is developed. The apparatus necessary for the measurements was suitably constructed and measurements of the fields of vision were made with it. The visibilities of six airplanes of different types of construction and use were measured, as well as the visibility of an automobile for comparison. An attempt was made to establish minimum visibility requirements and to express the excellence of visibility by means of a numerical coefficient.
Date: November 1931
Creator: Kurz, Gerhard
System: The UNT Digital Library
Approximation method for determining the static stability of a monoplane glider (open access)

Approximation method for determining the static stability of a monoplane glider

The calculations in this paper afford an approximate solution of the static stability. A derivation of the formulas for moment coefficient of a wing, moment coefficient of elevator, and the total moment of the combined wing and elevator and the moment coefficient with reference to the center of gravity are provided.
Date: November 1927
Creator: Lippisch, A.
System: The UNT Digital Library
Unsymmetrical Forces in an Airplane Cell (open access)

Unsymmetrical Forces in an Airplane Cell

This paper calls attention to the desirability of expanding airplane building regulations to include proof of safety for cases of unsymmetrical loading, at least in the structural members which are thereby specially stressed. The flight cases involve increases of the customary load assumptions through rudder deflection and aileron deflection.
Date: November 1929
Creator: Vogt, R.
System: The UNT Digital Library
Spatial Buckling of Various Types of Airplane Strut Systems (open access)

Spatial Buckling of Various Types of Airplane Strut Systems

Equations are presented for two and three dimensional strut systems along with tables of equations.
Date: November 1931
Creator: Teichmann, Alfred
System: The UNT Digital Library
Mathematical and Experimental Investigation of Heat Control and Power Increase in Air-Cooled Aircraft Engines (open access)

Mathematical and Experimental Investigation of Heat Control and Power Increase in Air-Cooled Aircraft Engines

In order to understand the numerical relations between the air velocity, temperature of the cylinder walls, heat dissipation, cylinder dimensions and type of construction an experimental plant was installed in the Siemens and Halske laboratory. The experimental cylinder was exposed to the air stream of a wind tunnel. The compression chamber was heated by an electrically heated oil bath kept constantly in motion by a stirrer. The wall temperatures were measured by thermocouples.
Date: November 1929
Creator: Gosslau, F.
System: The UNT Digital Library
Rigid Airships (open access)

Rigid Airships

Memorandum presenting the history and development of airships. Tables containing information and statistics regarding some of the current airships are provided.
Date: November 1923
Creator: Stahl, Friedrich
System: The UNT Digital Library
Monoplanes or Biplanes? (open access)

Monoplanes or Biplanes?

This article presents a discussion of the relative merits between monoplanes and biplanes. A comparison of the aerodynamic qualities and advantages of both types are provided.
Date: November 1923
Creator: Warner, Edward P.
System: The UNT Digital Library
Approximate Calculation of the Static Longitudinal Stability of Airplanes (open access)

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
System: The UNT Digital Library
Experiments With a Sphere From Which the Boundary Layer Is Removed by Suction (open access)

Experiments With a Sphere From Which the Boundary Layer Is Removed by Suction

The task of removing the boundary layer by suction consists in producing, in place of the ordinary flow with the formation of vortices, another kind of flow in which the vortices are eliminated by drawing small quantities of fluid from certain points on the surface into the interior of the body. The experiments with a sphere, which constitute the subject of this report, were made early in the present year .
Date: November 1926
Creator: Schrenk, Oskar
System: The UNT Digital Library
A Method for the Direct Determination of Wing-Section Drag (open access)

A Method for the Direct Determination of Wing-Section Drag

In order that the method may be more easily understood, we will first consider the simpler case when there is no lift, but only drag, and when the streamlines at the measuring point behind the obstacle are nearly parallel. Moreover, the flow is assumed not to deviate much from the two-dimensional flow.
Date: November 1925
Creator: Betz, A.
System: The UNT Digital Library
Devices for Prevention of Stalled Flight (open access)

Devices for Prevention of Stalled Flight

Memorandum describing warning or correcting devices based on the registering of two distinct factors, the air speed and the angle of attack. The authors of the report define the conditions for the flight of an airplane and then study the causes of stalled flight in the different cases where it can occur.
Date: November 1926
Creator: Mazer, Paul
System: The UNT Digital Library
Central Aerohydrodynamic Institute of Moscow, Russia (open access)

Central Aerohydrodynamic Institute of Moscow, Russia

The staff and construction of the Institute are described as well as a variety of experiments and researches being conducted there. The six sections of the laboratory are described, including the Section for Theoretical Researches, Section for Aerodynamic Researches, Windmill Section, Section for Engine-Propeller Groups, Section for Material Testing, and Section for Instrument Making. Special attention is given to the various wind tunnels and testing facilities present.
Date: November 1926
Creator: Margoulis, W.
System: The UNT Digital Library
The Constructional Design of Metal Flying-Boat Hulls: Part 1 & Workshop Notes on the Building of Metal Hulls: Part 2 (open access)

The Constructional Design of Metal Flying-Boat Hulls: Part 1 & Workshop Notes on the Building of Metal Hulls: Part 2

Part I of this paper covers the constructional design of metal flying-boat hulls and does not elaborate any further. Part II deals with the actual construction process of the hull.
Date: November 1928
Creator: Langley, M.
System: The UNT Digital Library
On the Take-Off of Heavily Loaded Airplanes (open access)

On the Take-Off of Heavily Loaded Airplanes

This report examines the take-off conditions of airplanes equipped with tractive propellers, and particularly the more difficult take-off of airplanes heavily loaded per unit of wing area (wing loading) or per unit of engine power (power loading).
Date: November 1928
Creator: Breguet, Louis
System: The UNT Digital Library