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An Introduction to the Laws of Air Resistance of Aerofoils
Report presents methods of calculating air resistance of airfoils under certain conditions of flow phenomena around the airfoil.
Date:
September 1918
Creator:
de Bothezat, George
System:
The UNT Digital Library
Drag or Negative Traction of Geared-Down Supporting Propellers in the Downward Vertical Glide of a Helicopter
Discussed here are computations of drag or negative traction of geared down supporting propellers in the downward vertical glide of a helicopter. By means of Frounde's Theory, the maximum value of the drag of a windmill is calculated. For wooden propellers, the author finds that the difference between the drag and the weight is proportional to the number of blades and is larger for propellers of small diameter; thus it is 25 kg. for a six blade propeller with a diameter of 2 m. 50.
Date:
September 1920
Creator:
Toussaint, A.
System:
The UNT Digital Library
The Dynamometer Hub
The construction of the dynamometer hub is illustrated and explained, and its electrical and aviation motor tests, as well as those in free flight, described.
Date:
September 1920
Creator:
Stieber, W.
System:
The UNT Digital Library
Experience With Geared Propeller Drives for Aviation Engines
An overview is given of experience with geared propeller drives for aviation engines. The development of gear wheels is discussed with emphasis upon bending stresses, compressive stresses, heating, and precision in manufacturing. With respect to the general arrangement of gear drives for airplanes, some principal rules of mechanical engineering that apply with special force are noted.
Date:
September 1920
Creator:
Kutzbach, K.
System:
The UNT Digital Library
Recent Efforts and Experiments in the Construction of Aviation Engines
It became evident during World War I that ever-increasing demands were being placed on the mean power of aircraft engines as a result of the increased on board equipment and the demands of aerial combat. The need was for increased climbing efficiency and climbing speed. The response to these demands has been in terms of lightweight construction and the adaptation of the aircraft engine to the requirements of its use.
Date:
September 1920
Creator:
Schwager, [Otto]
System:
The UNT Digital Library
The 1000 HP Traffic Airplane of the Zeppelin Works in Staaken
Report details the characteristics and advantages of the swift traffic airplane constructed by Zeppelin Works at Staaken. The maximum speed, weight, construction, layout, and landing capabilities of the plane are included.
Date:
September 1921
Creator:
Rohrbach, A. K.
System:
The UNT Digital Library
Competition for Safety Fuel Tanks
Report describing a competition for safety fuel tanks, including the prizes, requirements that must be fulfilled, some other characteristics, tests, and regulations.
Date:
September 1921
Creator:
unknown
System:
The UNT Digital Library
The Effect of Staggering a Biplane
This investigation was carried out by request of the United States Air Service at the Massachusetts Institute of Technology wind tunnel in 1918. As the data collected may be of general interest, they are published here by the National Advisory Committee for Aeronautics. The lift, drag, and center of pressure travel are determined for a biplane with a stagger varying from +100% to -100%. It is found that the efficiency and the maximum lift increase with positive stagger.
Date:
September 1921
Creator:
Norton, F. H.
System:
The UNT Digital Library
Glossary of Terms Used in Flying Boat Hull Construction
Memorandum presenting a glossary of terms used to describe flying boat hulls and the elements used in construction.
Date:
September 1921
Creator:
Nicolson, David
System:
The UNT Digital Library
Lift Theory of Supporting Surfaces: Second Article
Memorandum presenting a description of the hydrodynamic lift theory of supporting services. This report is mainly about the task of finding suitable wing sections for given lift conditions. Formulas are given for lift magnitude and moment, which make it possible to obtain solutions of great simplicity and clearness.
Date:
September 1921
Creator:
von Mises, R.
System:
The UNT Digital Library
A New Dynamometer Brake
The mechanism here described belongs to the class of dynamometer brake in which the motive power is transformed into heat in the brake itself. This mechanism was invented by the writer for the purpose of measuring forces in which the two factors, torque and speed, vary within broad limits, the mechanism itself being of simple construction and of still simpler operation.
Date:
September 1921
Creator:
Segrè, Marco
System:
The UNT Digital Library
Performance of a vane driven-gear pump
Given here are the results of a test conducted in a wind tunnel on the performance of a vane-driven gear pump used to pump gasoline upward into a small tank located within the upper wing from which it flows by gravity to the engine carburetor. Information is given on the efficiency of the pump, the head resistance of the vanes, the performance and characteristics of the unit with and without housing about the vanes, the pump performance when motor driven, and resistance and power characteristics.
Date:
September 1921
Creator:
Heald, R. H.
System:
The UNT Digital Library
Preliminary Calculation of Cylinder Dimensions for Aircraft Engines
It is extremely important in building aircraft engines to determine the requisite cylinder dimensions as accurately as possible, in order that the weight required for a given power shall not be excessive. This report presents a calculation method that depends on the air requirement of the fuel.
Date:
September 1921
Creator:
Schwager, Otto
System:
The UNT Digital Library
The Small Diesel Engine as an Automotive Engine
Essential principles for building small diesel engines and also structural details so far as feasibility are presented.
Date:
September 1921
Creator:
Frey, Ernst
System:
The UNT Digital Library
Aerodynamic Computation of Gliders
From Introduction: "In the following discussion, a knowledge of the theoretical principles of airplane construction is assumed, as presented in detail by Vogt and Lippisch in Nos. 7 and 10-19 of the 1919 volume of this publication. A few quantities will however be otherwise designated, in accordance with the Gottingen symbols."
Date:
September 1922
Creator:
Schrenk, M.
System:
The UNT Digital Library
Aerodynamic Laboratory at Cuatro Vientos
This report presents a listing of the many experiments in aerodynamics taking place at Cuatro Vientos. Some of the studies include: testing spheres, in order to determine coefficients; mechanical and chemical tests of materials; and various tests of propeller strength and flexibility.
Date:
September 1922
Creator:
Jubera
System:
The UNT Digital Library
The Disposal of Military Aircraft
"The end of the war saw every belligerent with vast stocks of aircraft and aircraft supplies in all stages of usefulness, much of the material being absolutely new. The question of the best method of getting rid of this accumulation is one which has been agitating those responsible for its disposal for more than three years now, but no wholly satisfactory solution has yet been reached" (p. 1).
Date:
September 1922
Creator:
Warner, Edward P.
System:
The UNT Digital Library
The Effect on Rudder Control of Slip Stream Body, and Ground Interference
"This investigation was undertaken to determine the relative effects of those factors which may interfere with the rudder control of an airplane, with especial reference to the process of landing. It shows that ground interference is negligible, but that the effects of a large rounded body and of the slip stream may combine to interfere seriously with rudder control at low flying speeds and when taxiing" (p. 1).
Date:
September 1922
Creator:
Hoot, H. I. & Bacon, D. L.
System:
The UNT Digital Library
Fatigue Resistance of Duralumin
Where, in the following report, mention is made of fatigue, it always refers to the weakening of the material produced by rapidly changing stresses below the point of elasticity. The alternating stress was obtained by a test bar which was held at one end and subjected to rotation. Most of the tests were conducted on connecting rods.
Date:
September 1922
Creator:
unknown
System:
The UNT Digital Library
Giant Airplanes
It is hardly possible for the most imaginative aeronautical enthusiast to look forward to a time when the airplane will have reached the dimensions commensurate with those already attained by the airship.
Date:
September 1922
Creator:
Warner, Edward P.
System:
The UNT Digital Library
International Aspects of Air Travel
This article discusses two areas of international air travel, namely, passports and customs, as well as smuggling.
Date:
September 1922
Creator:
Warner, Edward P.
System:
The UNT Digital Library
Miniature Airplanes
The present report will treat only the smallest airplanes equipped with engines. The two types discussed are those airplanes with the smallest dimensions, and those that have the smallest power requirements.
Date:
September 1922
Creator:
Warner, Edward P.
System:
The UNT Digital Library
The Prevention of Fire in the Air
On an airplane, the safeguards adopted may be divided into three classes, those intended to prevent a fire from getting started, those intended to put it out if it does get under way, and, finally, those designed to limit the damage which a fire can do. Some of the fire-related elements discussed include protecting the gasoline, fire extinguishers, a flame-tight bulkhead, and airship hazards.
Date:
September 1922
Creator:
Warner, Edward P.
System:
The UNT Digital Library
Problem of Glider Models
Any one endeavoring to solve the problem of soaring flight is confronted not only by structural difficulties, but also by the often far more difficult aerodynamic problem of flight properties and efficiency, which can only be determined by experimenting with the finished glider. The report primarily considers open-air experiments with glider models and some specific elements of gliders that have been studied using these experiments.
Date:
September 1922
Creator:
Espenlaub, Lippisch
System:
The UNT Digital Library