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Effect of Roughness on Properties of Airfoils
The first group of a large series of contemplated experiments on the effect of roughness was intended to show the effect of great roughness on airfoils of various sizes and attitudes.
Date:
August 1926
Creator:
Schrenk, O.
System:
The UNT Digital Library
Contribution to the Design and Calculation of Fuel Cams and Fuel Valves for Diesel Engines
In this work I have attempted to find a basis for the design of fuel cams, which will serve equally for large and small engines, both high-speed and low-speed.
Date:
August 1928
Creator:
Basu, Jatrindra Nath
System:
The UNT Digital Library
Effect of Viscosity in Speed Measurements With Double-Throat Venturi Tubes
In order to clarify the viscosity effect some experiments were made in the Gottigen low-pressure tunnel with the Bruhn double-throat Venturi tube. This type of tunnel makes it possible to vary the pressure and thereby the density within wide limits and consequently, to examine the viscosity effect. This, however, did not impair the results because pressure and temperature were determined at different periods.
Date:
August 1931
Creator:
Peters, H.
System:
The UNT Digital Library
Supplement to Comparison of Automatic Control Systems
"This analysis deals with the indirect regulator, wherefrom the behavior of the direct regulator is deduced as a limiting case. The prime mover is looked upon as "independent of the load": a change in the adjusting power (to be applied) for the control link (as, for example, in relation to the adjusting path (eta) with pressure valves or the rudder of vessels) does not modify the actions of the prime mover. Mass forces and friction are discounted; "clearance" also is discounted in the transmission links of the regulator" (p. 1).
Date:
August 1941
Creator:
Oppelt, W.
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
Lautal as a Material for Airplane Construction
Lautal is a refinable aluminum alloy which, unlike duralumin, contains no magnesium. According to the statements of the Lauta Works, lautal contains: aluminum, 94%; copper, 4%; silicon, 2%. The use of lautal as a construction material is discussed in relation to specific weight, production methods, and riveting tests.
Date:
August 1929
Creator:
Brenner, Paul
System:
The UNT Digital Library
Historical Notes on Aerodynamic Research
"It is obviously interesting to know the names of those who were the first contributors to aeronautical science. Therefore, without claiming to give a complete history, I present in this article a summary list of names in chronological order relating to the history of experiments on the resistance of the air and its application to aeronautics" (p. 1).
Date:
August 1924
Creator:
Dollfus, Charles
System:
The UNT Digital Library
Buckling Tests of Light-Metal Tubes
Report presenting an attempt to determine mathematically the buckling-strength curves of various centrally loaded light-metal tubes which exhibit conspicuous differences of behavior under compressive loads. For this purpose, Von Karman's method is used after adapting it to special conditions.
Date:
August 1929
Creator:
Schroeder, August
System:
The UNT Digital Library
On the stability of oscillations of an airplane wing
During a flight with a Van Berkel W. B. seaplane it was observed that the wing could perform violent oscillations. A theoretical and experimental investigation led to the conclusion, that in some cases an unstable oscillation of the wing-aileron system under the influence of the elastic and aerodynamic forces is possible without further external causes.
Date:
August 1923
Creator:
Von Baumhauer, A. G. & Koning, C.
System:
The UNT Digital Library
Carburetion in Aviation Engines
This report tries to solve the problem of supplying the engine cylinders with a mixture of fuel and air in the right ratio to obtain the greatest power from the engine with the least consumption of fuel.
Date:
August 1923
Creator:
Poincaré
System:
The UNT Digital Library
Recent Suggestions in Diesel-Engine Construction
Different methods for increasing the efficiency of diesel engines are presented and some new designs are given.
Date:
August 1927
Creator:
Bielefeld, F. Ernst
System:
The UNT Digital Library
Metal Construction Development Part 1: General, Strip Metal Construction - Fuselage
Memorandum presenting a general overview of aircraft constructed from metal and fuselages constructed from strip metal.
Date:
August 1929
Creator:
Pollard, H. J.
System:
The UNT Digital Library
Engines and Fuels
The report considers the effect on engines of the varying types of fuels now in use. Different types of fuels are examined and the influence of physical characteristics are considered.
Date:
August 1923
Creator:
unknown
System:
The UNT Digital Library
Vorticism in Aeronautics
Since the war there has been a considerable advance in knowledge on the subject of the airfoil and its behavior. The theory is now sufficiently advanced to make it possible to predict and to calculate certain results which previously could only be attained by direct experiment. The vortex theory receives special attention.
Date:
August 1923
Creator:
Sayers, W. H.
System:
The UNT Digital Library
Structural Details of German Light Airplanes
This report presents a review of German light airplane construction. Some of the topics discussed include: engines, fuselages, wings, landing gear, and other mechanical parts.
Date:
August 1930
Creator:
Schrenk, Martin
System:
The UNT Digital Library
Designing Seaplane Hulls and Floats
Experimental data, such as the results of tank tests of models, render it possible to predict, at least in principle, as to how a hull or float of a given shape will comport itself. We will see further along, however, how uncertain these methods are and how they leave room for empiricism, which will reign for a long time yet in seaplane research bureaus.
Date:
August 1926
Creator:
Benoit
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
Absorbing landing shocks
Report discussing tires, steel springs, hydraulic shock absorbers, and axle travel are all examined in relation to absorbing landing shocks.
Date:
August 1923
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