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On the recording of turbulent longitudinal and transverse fluctuations
"A thorough understanding of the turbulent flow movements cannot be arrived at from investigations of the temporal mean values of the flows alone. Study of the fluctuation phenomena themselves is indispensable. Thus turbulence research entered a new promising stage when investigators started performing fluctuation measurements and basing theories on those measurements" (p. 1).
Date:
August 1951
Creator:
Reichardt, H.
System:
The UNT Digital Library
Strength Investigations in Aircraft Construction Under Repeated Application of the Load
"In the calculation of the dimensions of modern machines and building constructions, account is taken of the frequency of the occurrence of the anticipated loads. It is generally assumed that these loads will be repeated an infinite number, or at any rate some millions, of times during the total working life of the construction. When calculating the dimensions of the structural parts of aircraft, on the contrary, a consideration only of those frequencies in the appearance of the loads which actually come into play in the various states of stress is allowable" (p. 1).
Date:
August 1946
Creator:
Gassner, E.
System:
The UNT Digital Library
Recent Researches in Airship Construction 2: Bending Stresses on an Airship in Flight
The first part of this report shows the differences between commercial and war airships and then goes on to show how some of the problems were solved. Their thorough investigations of these problems finally enabled the Schutte-Lanz Company to construct bulkhead diagrams for determining the buoyancy of airships, by means of which the size of each cell was established. These diagrams were derived from bulkhead diagrams employed in ship designing and are used in a similar manner.
Date:
August 1924
Creator:
Naatz, H.
System:
The UNT Digital Library
Recent Researches in Airship Construction 1: Forces of Flow on a Moving Airship and the Effect of the Control Surfaces
The problems as to how an airship can best be stabilized and steered and to what stresses it is subjected in the air, are so important as to determine in large measure the future development of airships much more than formerly when velocities of 30-35 meters (98-115 feet) per second were not known and the effects of the air flow were not so great.
Date:
August 1924
Creator:
Naatz, H.
System:
The UNT Digital Library
Structural and Economic Limits to the Dimensions of Airships
"In opposition to the advantage of larger dimensions, there is one disadvantage, namely, the weight of the structure increases more rapidly than the buoyancy. It is not possible, however, to determine a general law. In order to formulate one having the merit of simplicity, we will divide the structure into two parts: one subject to tensile and compressive stresses, varying directly as the ascensional or lifting forces; the other subject to varying stresses of the surface areas" (p. 1).
Date:
August 1924
Creator:
Crocco, G. A.
System:
The UNT Digital Library
Safety in Flight
Report presenting some topics related to safety in flight and the importance of having accurate statistics and information regarding aircraft problems and accidents. Some of the topics provided included perverted statistics, the British accident record, unregulated air traffic in America, and air mail in bad weather.
Date:
August 1922
Creator:
Warner, Edward P.
System:
The UNT Digital Library
Commercial Aircraft in War
The difference between aircraft for commercial and wartime uses is delineated, but the interchangability between the two is also discussed. Airships in both roles are also presented.
Date:
August 1922
Creator:
Warner, Edward P.
System:
The UNT Digital Library
Potentialities of the Parachute
The development of the parachute is presented as well as the future possibilities. The primary topics covered include allowing for wind in design, the parachutes used at balloon exhibitions, parachute use in the war, the delayed-opening type of parachute, and the use of parachutes on commercial airplanes.
Date:
August 1922
Creator:
Warner, Edward P.
System:
The UNT Digital Library
Turn Indicator
This report presents a study of an instrument that can warn the pilot of the turning of his airplane. This instrument must satisfy three conditions: 1) It must give useful indication immediately from take-off; 2) The indications must be instantaneous and require no exertion by the pilot; 3) The indicator must be sensitive only to changes of orientation in the horizontal plane. Different solutions are presented such as a gyroscope driven by the suction of a Venturi tube.
Date:
August 1922
Creator:
de Guiche, A. de Gramont
System:
The UNT Digital Library
Test of Specimen of Wood of Longerons of the S.E.5 Airplane After Seven Years' Service
"A transverse test was made of the wood sample using a 5,000 pound Olsen testing machine, the deflection under load being measured by means of a Wissler dial. The results of the transverse test are given and the stress-strain curve is attached" (p. 1).
Date:
August 1922
Creator:
unknown
System:
The UNT Digital Library
Police Regulation of Aircraft
Different aspects of aircraft regulation are discussed such as: protecting the public; the restriction of flights over crowds; regulations of wing-walkers.
Date:
August 1922
Creator:
Warner, Edward P.
System:
The UNT Digital Library
Utilization Conditions of Different Types of Airplanes
This report presents examples of different methods of comparing aircraft mathematically. In the example given a biplane and monoplane are compared as to what speed one type of airplane is better at than another.
Date:
August 1922
Creator:
De Marolles
System:
The UNT Digital Library
Coutinho-Sacadura Course Corrector
"The Coutinho-Sacadura course corrector is an instrument with which, knowing the angles of drift of two different courses, we may determine by simple readings: a) direction and velocity of wind; b) correction to be made in course followed by compass, in order to fly in a given direction; c) ground-speed of aircraft, the resultant of its air speed and the velocity of the wind" (p. 1).
Date:
August 1922
Creator:
Cabral, Sacadura
System:
The UNT Digital Library
Illumination of Airways and Landing Fields
Different illumination systems for landing fields are presented which include fixed beacons, signal guns, and light patterns such as T's and crosses. Some of the advantages and disadvantages for each of the lighting patterns are provided.
Date:
August 1922
Creator:
Stadthagen, Paul
System:
The UNT Digital Library
Description of the Klemperer Wing Strain Meter (Accelerometer)
The wing strain meter enables a pilot to know the strain on lifting surfaces and to warn him of the safe limits which may not be exceeded. In wing strain the most important factors are the force of gravity and the force of lift which gives the measure of the sustaining force, and their components which are perpendicular to the lifting surfaces. This reports methods for using the wing strain meter.
Date:
August 1922
Creator:
unknown
System:
The UNT Digital Library
Investigations on Reductions of Friction on Wings, in Particular by Means of Boundary Layer Suction
Memorandum presenting investigation on reductions of friction on wings, especially by means of boundary-layer suction. The report is broken up into several sections, including: causes of transition, laminar profiles with the transition taking place, laminar boundary-layer suction, investigation of the laminar pressure increase, investigation of the slot flow for laminar boundary-layer suction with single slots, tests about keeping a boundary layer for high Reynolds laminar with the aid of boundary-layer suction, and an investigation of a slightly-cambered laminar suction profile of 10.5-percent thickness.
Date:
August 1947
Creator:
Pfenninger, Werner
System:
The UNT Digital Library
High Efficiency of Seaplanes
A table is presented which includes data for calculating the index of efficiency. The author uses this data to conclude that seaplanes cannot be considered inferior to terrestrial airplanes.
Date:
August 1921
Creator:
Pegna, G.
System:
The UNT Digital Library
Problem of Landing
The author discusses various aspects of landing aircraft such as the actual process of touchdown and the problems associated with the tail skid touching the ground before the landing gear.
Date:
August 1921
Creator:
Pistolesi, E.
System:
The UNT Digital Library
Calculation of Wing Spars
A simplified formula for calculating wing spars is presented.
Date:
August 1921
Creator:
Ratzersdorfer, Julius
System:
The UNT Digital Library
Calculation of Wing Spars
The author presents a comparison and combination of the numerical and geometrical determinations of the maximum M, when calculating the maximum bay moment.
Date:
August 1921
Creator:
Müller-Breslau, H.
System:
The UNT Digital Library
Large German airship stations
"It is profitable to examine the organization and equipment of the German airship stations. The stations best adapted for serving as the basis of this study were chiefly constructed by the German Navy, during the war, for exclusively military purposes and do not therefore entirely satisfy the conditions of exploitation required for a civilian air service. The requisite modifications for satisfying the latter conditions may nevertheless be readily determined according to circumstances" (p. 1).
Date:
August 1921
Creator:
Sabatier, J.
System:
The UNT Digital Library
Shape and Strength of Seaplane Under-Structures With Special Regard to Seaworthiness
This report presents experiments and calculations for the purpose of determining the landing gear requirements upon the water. Moving pictures are given which furnish data and also may give both the magnitude and direction of the forces acting. Different classes of seaplanes are examined and proposals for calculation instructions are given.
Date:
August 1921
Creator:
Lewe, Victor
System:
The UNT Digital Library
Moments of Cambered Round Bodies
Results are presented for the moments and position of force centers of a series of cambered round bodies derived from a torpedo-like body of revolution. The effects of placing fins on the rear of the body of revolution are also included.
Date:
August 1949
Creator:
Kempf, Günther
System:
The UNT Digital Library