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99
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234 Matching Results
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Recent Progress in the Thawing of Frozen Gravel in Placer Mining
Technical paper issued by the Bureau of Mines over progress made for thawing gravel in placer mines. Different thawing tests are presented and discussed. This paper includes tables, photographs, and illustrations.
Date:
June 1922
Creator:
Janin, Charles
Object Type:
Report
System:
The UNT Digital Library
The Rohrbach "Rocco" Seaplane: New German Commercial Seaplane With Two Rolls-Royce "Condor" Engines
The Rocco is a has a monoplane wing surmounted by two engines. Its flat sided narrow beam hull is steadied when on the water by 2 outboard wing floats. Details of the design, hull accommodation, power plant, drawings, and photographs are provided. The report is incomplete.
Date:
June 1927
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
The Focke-Wulf "G.L. 18" : Twin-Engine 150 HP. Commercial Airplane
A small commercial airplane, the Focke-Wulf G.L. 18 has two engines (75 HP. Junker). It is a monoplane and the engines are wing mounted. Details of the engines, power, wings, ailerons, fuselage, empennage, landing gear, characteristics, drawings, and photographs are provided.
Date:
June 1927
Creator:
Serryer, J.
Object Type:
Report
System:
The UNT Digital Library
Junkers Airplane "G 24": All-Metal Commercial Airplane
The G 24 is a commercial airplane with three engines and a monoplane wing. It is known for its all metal construction and stabilizers.
Date:
June 1927
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Climbing Efficiency of Aircraft
The object of this report was to indicate that we frequently only make use of 50 percent of the maximum brake horsepower of the engine in taking off the ground, that this loss is not inevitable, and that the effort to get engines of low weight per horsepower by boosting revolutions is of very little use to bombers and commercial airplanes.
Date:
June 1927
Creator:
Walker, C. C.
Object Type:
Report
System:
The UNT Digital Library
Drag measurements of two thin wing sections at different index values
It is stated that the index value 6000, as found in normal tests of wing sections with a 20 cm chord, falls in the same region where the transition of laminar to turbulent flow takes place on thin flat plates. It is to be expected that slightly cambered, thin wing sections will behave similarly. The following test of two such wing sections were made for the purpose of verifying this supposition.
Date:
June 1927
Creator:
Ackeret, J.
Object Type:
Report
System:
The UNT Digital Library
Investigation of a Wing With an Auxiliary Upper Part
This report presents experiments in which two parts of the wing were arranged so as to form a biplane, which was subjected to normal three-component measurements, the two parts being placed in various relative positions with respect to the gap a and the stagger b.
Date:
June 1927
Creator:
Seiferth, R.
Object Type:
Report
System:
The UNT Digital Library
Aerodynamic laboratory at Cuatro Vientos
This report presents a description of the design of the Cuatro Vientes wind tunnel.
Date:
June 1927
Creator:
Caracciolo, Moreno
Object Type:
Report
System:
The UNT Digital Library
Tasks of Air Flow Research
The researches at the Gottingen Institute are discussed especially in regards to the physical properties of fluids. The three main properties of fluids examined concern density, viscosity, and compressibility.
Date:
June 1926
Creator:
Prandtl, L.
Object Type:
Report
System:
The UNT Digital Library
Calculation of Combining Effects in the Structure of Airplane Wings: A Rational Basis for Estimating the Reduction in the Design Load on Wing Beams Due to the Influence of Ribs and Covering Toward Causing the Beams to Deflect Together
This lecture concerns the combining effects in airplane wings so as to save some of the dead weight. Equations are provided in order to calculate some of the load characteristics and some of the effects to be considered.
Date:
June 1926
Creator:
Thalau, K.
Object Type:
Report
System:
The UNT Digital Library
Application of The "Magnus Effect" to the Wind Propulsion of Ships
Report presenting an explanation of the Flettner wind-driven rotor ship and how it functions using the "Magnus effect". The advantages of the construction of this type of ship and the development of flow around the cylinder used to power it are described.
Date:
June 1926
Creator:
Prandtl, L.
Object Type:
Report
System:
The UNT Digital Library
Metal Spars
Certain principles are common to all metal spars and the design of a particular metal spar is followed throughout the design process.
Date:
June 1926
Creator:
Haddon, J. D.
Object Type:
Report
System:
The UNT Digital Library
Choice of Profile for the Wings of an Airplane Part 1
"The choice of the profile for the wings of an airplane is a problem which should be solved by a scientific method based on data obtained by systematic experimentation. The problem, in its present form, may be stated as follows: "To find a profile which has certain required aerodynamic characteristics and which encloses the spars, whose number, dimensions and separating distance are likewise determined by structural considerations." At present, the static test, corresponding to the case of accelerated flight at limited speed, requires the knowledge of the moment of the aerodynamic resultant at the angle of zero lift, and the possibility of controlling the magnitude of the corresponding absolute coefficient within more or less extensive limits" (p. 1).
Date:
June 1928
Creator:
Toussaint, A. & Carafoli, E.
Object Type:
Report
System:
The UNT Digital Library
Speed and deceleration trials of U.S.S. Los Angeles
From Summary: "The trials reported in this report were instigated by the Bureau of Aeronautics of the Navy Department for the purpose of determining accurately the speed and resistance of the U. S. S. "Los Angeles" with and without water recovery apparatus, and to clear up the apparent discrepancies between the speed attained in service and in the original trials in Germany. The trials proved very conclusively that the water recovery apparatus increases the resistance about 20 per cent, which is serious, and shows the importance of developing a type of recovery having less resistance. Between the American and the German speed trials without water recovery there remains an unexplained discrepancy of nearly 6 per cent in speed at a given rate of engine revolutions."
Date:
June 12, 1928
Creator:
De France, S. J. & Burgess, C. P.
Object Type:
Report
System:
The UNT Digital Library
The Gaseous Explosive Reaction: The Effect of Inert Gases
"Attention is called in this report to previous investigations of gaseous explosive reactions carried out under constant volume conditions, where the effect of inert gases on the thermodynamic equilibrium was determined. The advantage of constant pressure methods over those of constant volume as applied to studies of the gaseous explosive reaction is pointed out and the possibility of realizing for this purpose a constant pressure bomb mentioned" (p. 479).
Date:
June 24, 1927
Creator:
Stevens, F. W.
Object Type:
Report
System:
The UNT Digital Library
The effects of fuel and cylinder gas densities on the characteristics of fuel sprays for oil engines
"This investigation was conducted as a part of a general research on fuel-injection engines for aircraft. The purpose of the investigation was to determine the effects of fuel and cylinder gas densities with several characteristics of fuel sprays for oil engines. The start, growth, and cut-off of single fuel sprays produced by automatic injection valves were recorded on photographic film by means of special high-speed motion-picture apparatus" (p. 491).
Date:
June 14, 1927
Creator:
Joachim, W. F. & Beardsley, Edward G.
Object Type:
Report
System:
The UNT Digital Library
Full Scale Tests of Wood Propellers on a VE-7 Airplane in the Propeller Research Tunnel
"The investigation described in this report was made primarily to afford a comparison between propeller tests in the new propeller research tunnel and flight tests and small model tests on propellers. Three wood propellers which had been previously tested in flight on a VE-7 airplane, and of which models had also been tested in a wind tunnel, were tested again on a VE-7 airplane in the propeller research tunnel. The results of these tests are in fair agreement with those of the flight and model tests" (p. 445).
Date:
June 18, 1928
Creator:
Weick, Fred E.
Object Type:
Report
System:
The UNT Digital Library
Full Scale Tests on a Thin Metal Propeller at Various Tip Speeds
"This report describes an investigation made in order to determine the effect of tip speed on the characteristics of a thin-bladed metal propeller. The propeller was mounted on a VE-7 airplane with a 180-HP E-2 engine, and tested in the 20-foot propeller research tunnel of the National Advisory Committee for Aeronautics. It was found that the effect of tip speed on the propulsive efficiency was negligible within the range of the tests, which was from 600 to 1,000 feet per second (about 0.5 to 0.9 the velocity of sound in air)" (p. 465).
Date:
June 20, 1928
Creator:
Weick, Fred E.
Object Type:
Report
System:
The UNT Digital Library
An Investigation of the Use of Discharge Valves and an Intake Control for Improving the Performance of N.A.C.A. Roots Type Supercharger
"This report presents the results of an analytical investigation on the practicability of using mechanically operated discharge valves in conjunction with a manually operated intake control for improving the performance of N. A. C. A. Roots type superchargers. These valves, which may be either of the oscillating or rotating type, are placed in the discharge opening of the supercharger and are so shaped and synchronized with the supercharger impellers that they do not open until the air has been compressed to the delivery pressure. The intake control limits the quantity of air compressed to engine requirements by permitting the excess air to escape from the compression chamber before compression begins" (p. 479).
Date:
June 29, 1928
Creator:
Schey, Oscar W. & Wilson, Ernest E.
Object Type:
Report
System:
The UNT Digital Library
The Diesel as a Vehicle Engine
The thorough investigation of a Dorner four-cylinder, four-stroke-cycle Diesel engine with mechanical injection led me to investigate more thoroughly the operation of the Diesel as a vehicle engine. Aside from the obvious need of reliability of functioning, a high rotative speed, light weight and economy in heat consumption per horsepower are also indispensable requirements.
Date:
June 1928
Creator:
Neumann, Kurt
Object Type:
Report
System:
The UNT Digital Library
Investigation of the Effect of the Fuselage on the Wing of a Low-Wing Monoplane
Memorandum presenting the mutual action of wing and fuselage, which greatly affects the construction of airplanes. A description of systematic wind-tunnel tests that were made to answer that question is provided. Other tests deal with the transition from fuselage to wing root, which, if inadequate on low-wing monoplanes, may become dangerous by causing the air flow to separate at the wing root.
Date:
June 1929
Creator:
Muttray, H.
Object Type:
Report
System:
The UNT Digital Library
Investigation of Atomization in Carburetors
This report presents methods by which it is possible to determine, in a simple manner, both pressure atomization and carburetor atomization.
Date:
June 1929
Creator:
Sauter, J.
Object Type:
Report
System:
The UNT Digital Library
Revision of the American Lemming Mice (Genus Synaptomys)
Brief summary of the geographic distribution, habits, history, and subgenera of Synaptomys.
Date:
June 30, 1927
Creator:
Howell, A. Brazier
Object Type:
Report
System:
The UNT Digital Library
Chimney Cowl.
Patent for a chimney cowl with a manually controlled spark outlet
Date:
June 4, 1920
Creator:
Jezova, Mary
Object Type:
Patent
System:
The Portal to Texas History